Water has a relatively low specific heat.
True
False
Answers
Answer:
The answer is False
Explanation:
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Related Questions
Current during EPSPs and Action Potentials (15 points): Consider a spherical neuron of a radius of 10 um. The neuron has a resting membrane potential of -60mV and a specific capacitance of 10nF/mm2. a) What is the net charge on the inside surface of the neuronal membrane during rest? (3 points) b) The peak-to-peak amplitude of the action potential for this neuron is 100 mV (from -60mV to 40mV). Then what is the net charge change on the inside surface of the membrane at the peak of an action potential (2 points)?
c) If the rising and falling phases of the action potential are both about 0.5ms, what would be the average current amplitudes through the membrane during the rising and falling phases? (5 points) d) By similar calculations you made above, estimate the current flow during a postsynaptic potential with a peak amplitude of 10 mV (measured from resting level), and rise and fall durations of 5 ms. What is the ratio of average currents generated by a spike and a PSP? Show that you can calculate this ratio by using only their peak voltages and average durations?
Answers
a) The net charge on the inside surface of the neuronal membrane during rest can be calculated using the formula: Q = C * V
where Q is the net charge, C is the capacitance per unit area, and V is the membrane potential.
The surface area of the neuron is given by:
A = 4π\(r^2\)= 4π(10 um)^2 = 1.26 x \(10^-8 m^2\)
So, the capacitance of the neuron is:
\(C = 10 nF/mm^2 * (1 mm/10^6 um)^2 * 1.26 x 10^-8 m^2 = 1.26 x 10^-14 F\)
The net charge on the inside surface of the membrane during rest is then:
\(Q = C * V = 1.26 x 10^-14 F * (-60 mV) = -7.56 x 10^-13 C\)
b) The net charge change on the inside surface of the membrane at the peak of an action potential can be calculated by subtracting the net charge at rest from the net charge at the peak of the action potential. Since the peak-to-peak amplitude of the action potential is 100 mV, the membrane potential at the peak is:
V_peak = -60 mV + 100 mV = 40 mV
So, the net charge change at the peak is:
\(ΔQ = C * ΔV = 1.26 x 10^-14 F * (40 mV - (-60 mV)) = 1.26 x 10^-13 C\)
c) The average current amplitude during the rising and falling phases of the action potential can be estimated using the formula:
I = C * ΔV / Δt
where Δt is the duration of the rising or falling phase. Since both the rising and falling phases are about 0.5 ms, we can estimate the average current amplitude during each phase as:
I_rising = C * (40 mV - (-60 mV)) / (0.5 ms) =\(2.52 x 10^-8 A\)
I_falling = C * ((-60 mV) - 40 mV) / (0.5 ms) \(= -2.52 x 10^-8\) A
Note that the current during the falling phase is negative, indicating an outward flow of positive charge.
d) The current flow during a postsynaptic potential (PSP) can be estimated using the same formula as for the action potential:
I_PSP = C * ΔV / Δt
where ΔV is the peak amplitude of the PSP (measured from resting level) and Δt is the rise or fall duration. Since the peak amplitude is 10 mV and the rise and fall durations are both 5 ms, we can estimate the average current amplitude as:
I_PSP = C * (10 mV) / (5 ms) = 2 x 10^-10 A\(2 x 10^-10 A\)
The ratio of average currents generated by a spike and a PSP can be calculated using only their peak voltages and average durations, as follows:
I_spike / I_PSP = (C * ΔV_spike / Δt_spike) / (C * ΔV_PSP / Δt_PSP)
= (ΔV_spike / Δt_spike) / (ΔV_PSP / Δt_PSP)
Using the values given in parts (b) and (d), we can calculate this ratio as:
I_spike / I_PSP = [(40 mV - (-60 mV)) / (0.5 ms)] / [(10 mV) / (5 ms).
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Which of the following would have MORE gravitational potential energy? Explain why.
1. a mic dropped from 5 meters above the surface of Earth OR a mic dropped from S meters above the surface of Jupiter
2. Someone jumping out of a plane at 5000 m OR someone jumping out at 8000 m?
Answers
Answer:
1. A microphone dropped 5 meters above the surface of Jupiter
2. Someone jumping out of a plane at 8000 meters
Explanation:
*Note: As clarified by the person who asked the question, the "S" in problem 1 is meant to be a 5.
The potential energy of an object is given by \(PE=mgh\), where \(m\) is the mass of the object, \(g\) is acceleration due to gravity, and \(h\) is the height of the object.
In problem 1, it is given that the height is the same for both objects and implied that the mass is the same for both objects. However, acceleration due to gravity is about 2.54 times greater on Jupiter than on Earth. Therefore, a microphone dropped 5 meters above the surface of Jupiter will have more potential energy than the same microphone dropped 5 meters above the surface of Earth.
Similarly, in problem 2, mass and acceleration due to gravity are maintained. The only difference is the height the person is jumping out of. Since potential energy is directly proportional to height, the larger the height, the more potential energy. Thus, someone jumping out of a plane at 8000 meters will have more potential energy than someone of the same mass jumping out of a plane on the same planet at 5000 meters.
How long has Pripyat been unoccupied?
Answers
The numbers of years that Pripyat been unoccupied is 36 years.
Why was Pripyat left behind?"The Chernobyl tragedy damaged the ecology irreparably, and the effects will continue for thousands of years." Due to excessive radiation levels, the area was evacuated, and Pripyat, a once-vibrant city of 50,000 people that included many nuclear plant workers, was left in ruins. Its urban landscape become covered with trees and vines over time.
Therefore, According to experts, the region won't be secure for at least 3,000 years; nevertheless, other people think this estimate is overly optimistic. A 2016 research states that it is anticipated that the reactor site won't be livable for at least 20,000 years.
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Find the missing force
Answers
The force is 220N.
What is force?Force is a physical influence that causes an object to accelerate, slow down,stop or change its direction. Forces can be external, like gravity or the push of a hand, or internal, like the tension of a rope or the thrust of a jet engine. Forces are measured in Newtons, named after the scientist who discovered them. Forces always act in pairs, so when one object exerts a force on another, the second object also exerts an equal and opposite force.
We know that,
F=ma
F=10×(-4)
=-40N
Given,
F1=100
F2=80
=F=(F1+F2)-F3
=-40=(100+80)-F3
=-40-180= -F3
=-220=F3
=F3=220N
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The trunk of a elephant may extend up to 2.2 m. It acts much like an organ pipe only open at one end when the elephant blows air through it.
1) Calculate the fundamental frequency of the sound the elephant can create with its trunk. (Express your answer to two significant figures.)
(express in Hz)
2) If the elephant blows even harder, the next harmonic may be sounded. What is the frequency of the first overtone? (Express your answer to two significant figures.)
(express in Hz)
Answers
The calculated answers are- Fundamental frequency is 38.63 Hz and frequency of the first overtone is 115.90 Hz.
How to calculate the frequencies for a elephant trunk which behaves like an organ pipe?Any integer multiple of a pipe's fundamental or natural frequency is considered to be a harmonic. When an antinode is present at one or both of the pipe's open ends, open air columns will naturally resonate at specific frequencies (a closed end of the pipe has a node). For an open-closed pipe, the following equation is used to determine the harmonic frequencies:
\(f = \frac{nv}{4L}\)
where,
f = frequency
n = harmonic number
v = speed of sound
L = length of pipe in meters
An organ pipe with a closed end can be used to represent the elephant's trunk; in pipes, closed ends represent nodes and open ends represent antinodes or bellies.
The formula for this system's wavelengths is-
4L = nλ
where n = 1, 3, 5, 7..
1) To calculate the fundamental frequency (n = 1):
f = 340 / 4 × 2.2
f = 38.63 Hz
2) To calculate the frequency of the first overtone (n = 3):
f = 3 × 340 / 4 × 2.2
f = 115.9 Hz
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21. Compare and contrast beta particles to the electrons that surround neutral atoms.
UGH HELP MEEE PLSS
Answers
Beta particles normally travel very fast out of a nucleus in a straight line. Electrons normally orbit the nucleus of an atom.
They both have the same mass and the same charge.
Determina la presión que ejercen los patinadores sobre el hielo, teniendo en cuenta que la cuchilla del patín mide 30cm de largo y su grosor es de 5mm, y que el peso de las dos personas es 120kg
Answers
Answer:
La presión que los patinadores ejercen sobre el hielo es 7,848,000 Pa
Explanation:
Los parámetros dados de los patinadores en la pala son;
La longitud de la hoja en el patín, l = 30 cm = 0.03 m
El espesor de la hoja, t = 5 mm = 0,005 m
El peso de las dos personas, m = 120 kg
Suponiendo que la sección transversal de la cuchilla sobre el hielo es rectangular, tenemos;
A = l × t
∴ A = 0,03 m × 0,005 m = 0,00015 m²
La fuerza de peso de los dos patinadores, W = m × g
Dónde;
g = La aceleración debida a la gravedad ≈ 9,81 m / s²
m = La masa de los dos patinadores = 120 kg
∴ W = 120 kg × 9,81 m / s² = 1,177,2 N
Presión, P = Fuerza, F/(Área, A)
∴ P = (1.177,2 N) / (0.00015 m²)= 7,848,000 Pascals
La presión que los patinadores ejercen sobre el hielo., P = 7,848,000 Pascals
I need help!
Pleeeeeeeeaaaaaaaaaaaaasssssssssssseeeeeeeeeeee?
Answers
Answer:
np 500000 eeeeeeeeeeee
Explanation:
346 763 999 eeeeeeeeeeeee
The diffusion of inanimate forms of energy was vital to the accelerated development of the modern world. The industry is completely dependent on the techniques of extracting energy from nature. The development of energy sources or the lack of them determined the fate of countries. Those that were able to develop and exploit them led the industrialization process, those that did not invest in the energy sector became technologically lagging countries.
Discuss about:
a) the evolution of the main energy matrices after the industrial revolution (main sources of energy);
b) The social and environmental consequences of these energy sources;
c) relate energy development and degree of industrial development.
Answers
The evolution of energy matrices, the social and environmental consequences of energy sources, and the relationship between energy development and industrial development are critical aspects of understanding the interplay between energy and the modern world. Balancing the need for energy with sustainability and minimizing environmental impacts is a key challenge for societies today.
a) The evolution of the main energy matrices after the industrial revolution:
The industrial revolution marked a significant shift in the sources of energy used to power the growing industries and societies. Prior to the industrial revolution, human and animal labor, along with limited use of water and wind power, were the primary sources of energy. However, with the advent of steam engines and mechanization, there was a need for more abundant and efficient sources of energy.
Coal: Coal became the dominant energy source during the early stages of the industrial revolution. It provided the necessary fuel for steam engines and played a crucial role in powering factories, railways, and steamships.
Oil: The discovery and commercialization of oil in the late 19th century revolutionized the energy landscape. Oil became a major source of energy for transportation, as it fueled the internal combustion engines of automobiles, trucks, and airplanes.
Natural Gas: With the expansion of oil drilling, natural gas also emerged as an important energy source. It is used for heating, electricity generation, and as a feedstock for various industrial processes.
Nuclear Energy: The development of nuclear power in the mid-20th century introduced a new source of energy. Nuclear reactors harness the energy released from nuclear fission reactions to generate electricity.
Renewable Energy: In recent decades, there has been a growing emphasis on renewable energy sources such as solar, wind, hydroelectric, and geothermal power. These sources offer sustainable alternatives to fossil fuels, with lower environmental impact and the potential for long-term energy security.
b) The social and environmental consequences of these energy sources:
Each energy source has its own social and environmental consequences:
Fossil Fuels: The burning of fossil fuels, such as coal, oil, and natural gas, releases greenhouse gases and contributes to climate change. Extraction of fossil fuels can lead to habitat destruction, water pollution, and health hazards for workers and nearby communities.
Nuclear Energy: While nuclear energy does not produce greenhouse gas emissions during operation, it presents risks associated with accidents, radioactive waste disposal, and potential weaponization of nuclear materials. Public safety concerns and environmental risks have led to debates over the use of nuclear power.
Renewable Energy: Renewable energy sources offer benefits in terms of reduced greenhouse gas emissions and environmental sustainability. However, their deployment may require land use changes, and some technologies (e.g., large-scale hydroelectric dams) can cause ecological disruptions and displacement of communities.
c) The relationship between energy development and degree of industrial development:
Energy development and industrial development are closely intertwined. The availability of affordable and reliable energy sources is crucial for driving industrialization and economic growth. Access to abundant energy resources enables countries to power their industries, expand transportation networks, and improve living standards.
Countries that have invested in the development and exploitation of energy sources have typically experienced accelerated industrialization and technological advancement. The ability to secure and utilize energy resources efficiently has been a determining factor in a country's competitiveness and economic prosperity.
Conversely, countries that lack access to energy sources or fail to invest in their energy sectors may face challenges in industrial development. Limited energy availability can constrain production capacities, limit access to modern technologies, and hinder economic progress.
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The more oxygen the muscles receive, the more energy you have
Answers
Answer:
true
Explanation:
I think If I am not tell me
Which answer below is not a statement of the second law of thermodynamics? a. Real processes proceed in a preferred direction. b. In theory, heat engines working in a cycle employ reversible processes. c. The entropy of the universe increases in all natural processes d. Energy does not flow spontancously by heat from a cold to a hot reservoir. You cannot construct a heat engine operating in a cycle that does nothing but take heat from a reservoir and perform an equal amount of work
Answers
The answer that is not a statement of the second law of thermodynamics is d. Energy does not flow spontaneously by heat from a cold to a hot reservoir.
Options a, b, and c all reflect different aspects of the second law of thermodynamics, such as the preferential direction of real processes, the increase of entropy in natural processes, and the limitation on constructing a heat engine that only performs work without rejecting any heat to a colder reservoir.
However, option d contradicts the second law by suggesting the spontaneous flow of heat from a cold to a hot reservoir, making it the answer that is not a statement of the second law of thermodynamics.
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A 712 kg car is traveling at 5.6 m/s when a force acts on it for 8.4s, changing its velocity to 10.2 m/s. What is the change in kinetic energy?
Answers
Answer:
11164.16J
Explanation:
Kinetic energy of the car is given by
KE = \(\frac{1}{2} mv^{2}\)
∴ KE = \(\frac{1}{2}\) × 712 × (5.6)²
= 11164.16J
=11164.16J is correct answer
(hop this helps can I pls have brainlist (crown)☺️)
The change in kinetic energy is 11164.16 J.
What is energy?
Energy is the ability or capability to do tasks, such as the ability to move an item (of a certain mass) by exerting force. Energy can exist in many different forms, including electrical, mechanical, chemical, thermal, or nuclear, and it can change its form.
Kinetic energy of the car is given by
KE = \(\frac{1}{2} mv^{2}\)
KE = × 712 × (5.6)²
= 11164.16J
The change in kinetic energy is 11164.16 J.
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The amount of lateral strain in a tension member can be calculated using OA the coeficient of expansion B the moment of inertia OCthe yield stress OD Poisson's rati
Answers
The amount of lateral strain in a tension member can be calculated using Poisson's ratio.
To calculate the lateral strain, we can use the equation: ε_lateral = -ν * ε_longitudinal
Where:
ε_lateral = Lateral strain
ν = Poisson's ratio
ε_longitudinal = Longitudinal strain
Poisson's ratio (ν) is a material property that describes the ratio of lateral strain to longitudinal strain when a material is subjected to an axial load. It is defined as the negative ratio of the transverse strain to the longitudinal strain.
Calculating the lateral strain involves determining the longitudinal strain, which can be calculated using the equation:ε_longitudinal = ΔL / L
Where:
ε_longitudinal = Longitudinal strain
ΔL = Change in length of the tension member
L = Original length of the tension member
Once the longitudinal strain is calculated, we can use Poisson's ratio to determine the lateral strain by multiplying the longitudinal strain by the negative value of Poisson's ratio.
It is important to note that the lateral strain is typically very small compared to the longitudinal strain in a tension member, especially for materials with a low Poisson's ratio.
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What contains the DNA in plant cells and animal cells
Answers
Answer:
Although the vast majority of DNA in most eukaryotes is found in the nucleus, some DNA is present within the mitochondria of animals, plants, and fungi and within the chloroplasts of plants.
Explanation:
Which of the following substance used to selectively absorb certain frequencies of light and transmit or reflect the rest; responsible for object's colour?
A. Reflection
B. Refraction
C. Pigment
D. Tyndall scattering
Answers
Answer:
\(D. \: Tyndall \: scattering.\)
A water valve that regulates water flow to a water-cooled condenser based on the temperature of condenser exhaust water is a ____ water valve.
Answers
A water valve that regulates water flow to a water-cooled condenser based on the temperature of condenser exhaust water is a thermostatic water valve.
This type of valve uses a temperature-sensitive element, such as a wax pellet or a bimetallic strip, to control the flow of water.
When the temperature of the condenser exhaust water rises above a setpoint, the element expands or contracts, causing the valve to open or close. By adjusting the flow of water, the thermostatic water valve helps maintain the desired temperature within the condenser.
The purpose of this valve is to ensure optimal cooling efficiency and prevent overheating of the condenser. As the condenser exhaust water temperature increases, the valve responds by allowing more water to flow through the condenser, thus enhancing the cooling effect. Conversely, when the temperature decreases, the valve restricts the flow, conserving water and maintaining a stable temperature.
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Your private jet has a 7,230 gallon fuel tank that you need to top off. If the density of aviation fuel is 0.80kg/liter, what is the mass (kg) of full tank of fuel?
Answers
The mass of a full tank of fuel is 5,784 kilograms.
To calculate the mass of the fuel, we first need to convert the volume from gallons to liters. Since 1 gallon is approximately equal to 3.785 liters, the fuel tank's volume is
7,230 gallons × 3.785 liters/gallon ≈ 27,369.45 liters.
Next, we can calculate the mass of the fuel by multiplying the volume by the density. The density of aviation fuel is given as 0.80 kilograms per liter. Therefore, the mass of the fuel in the tank is
27,369.45 liters × 0.80 kilograms/liter ≈ 21,895.56 kilograms.
Hence, the mass of a full tank of fuel is approximately 21,895.56 kilograms.
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The total amount of kinetic energy associated with the motion
of atoms or molecules in an object is referred to as
A
B
C
D
Heat
Light
Sound
Spin
1250
Answers
The total amount of kinetic energy associated with the motion of atoms or molecules in an object is referred to as Heat.
What is kinetic energy?Kinetic energy is the energy of motion. It is the energy possessed by a body due to its motion. The kinetic energy of an object is equal to one half of the product of its mass and the square of its velocity. In equation form, kinetic energy can be expressed as KE = 1/2 mv2, where m is the mass of the object and v is its velocity. Kinetic energy can be used to do work. For example, when a car accelerates, its kinetic energy is used to overcome the force of gravity and friction, allowing it to move forward. Kinetic energy can also be used in other situations such as the kinetic energy of a thrown baseball or the kinetic energy of a swinging pendulum. Kinetic energy is a form of energy that can be converted into other forms of energy, such as heat and sound, or used to do work.
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ILL GIVE BRAINLIEST.
Ginny throws the Chaser up the air in a game of Quidditch with a velocity of 55 m/s. Assuming it has lost any magic and is not affected by air resistance, answer the following questions.
c) Assuming she is 10 meters off the ground when she throws it, with what velocity will it hit the ground?
Answers
Two infinitely long parallel wires are separated by a distance of 20 cm. If the wires carry current of 10 A in opposite directions, calculate the force on the wires.
Answers
The force on the wires is -0.08 N, and it acts to pull the wires towards each other.
F = (μ₀/2π) * (I₁ * I₂ / d)
F = (4π x \(10^{-7\) N/A² / 2π) * (10 A * (-10 A) / 0.2 m)
F = -0.04 N/m
\(F_total\) = F * 2L = -0.08 N\(L^{-1\)
Force is a physical concept that refers to the influence that one object or system exerts on another object or system, causing it to accelerate or change its state of motion. In other words, force is what makes objects move or stop moving. Force is typically measured in units of Newtons (N).
There are many different types of forces, including gravitational force, electromagnetic force, strong and weak nuclear forces, frictional force, tension force, and buoyant force, among others. These forces can be either attractive or repulsive, depending on the nature of the objects involved. The laws of physics describe how forces interact with matter, and they govern everything from the motion of planets in the solar system to the behavior of subatomic particles.
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The mass of the Moon is 7.35 × 1022 kg and its radius is 1738 km. What is the gravitational field strength on the surface of the Moon?
Answers
Answer:
g = 1.62 N/kg
Explanation:
g = GM/r²
= (6.67 x 10⁻¹¹ x 7.35 x 10²²) / (1738 x 10³)²
= 1.62 N/kg
Hope this helps!
Help pls and. No links pls
Answers
Answer:
the answer to this question will be False
Answer:
false.......,.....,...........
please help me!!!!!! :)
Answers
Answer:
The president is permitted to veto specific legislative acts, but Congress has ... and judicial appointments and on the approval for ratification of treaties. ... State shall have the Qualifications requisite for Electors of the most numerous Branch of the State Legislature. ... No Bill of Attainder or ex post facto Law shall be passed.
Explanation:
Find the change in gravitational potential energy of the following a) A box of mass 10kg which is raised 1.6 meters vertically
Answers
We are asked to determine the change in gravitational potential energy. To do that we will use the following formula:
\(\Delta U=mg\Delta h\)Where:
\(\begin{gathered} \Delta U=\text{ change in potential energy} \\ m=\text{ mass} \\ g=\text{ acceleration of gravity} \\ \Delta h=\text{ change in height} \end{gathered}\)The change in height is the distance that the object is raised. Therefore, plugging in the values we get:
\(\Delta U=(10kg)(9.8\frac{m}{s^2})(1.6m)\)Solving the operations:
\(\Delta U=156.8J\)Therefore, the change in gravitational potential energy is 156.8 Joules.
a charged particle is immersed in a uniform magnetic field coming out of the page and is moving along a circular path in the counter-clockwise direction. what is the charge of the particle in this situation?
Answers
The charge of the particle in this situation is positive. When a charged particle is immersed in a uniform magnetic field, it experiences a force known as the Lorentz force, which is given by the equation:
F = q(v × B)
Where F is the Lorentz force, q is the charge of the particle, v is the velocity of the particle, and B is the magnetic field.
In this case, the particle is moving along a circular path in the counter-clockwise direction, which means that the force acting on the particle is directed towards the center of the circle. This force is known as the centripetal force, and it is given by the equation:
F = mv^2/r
Where m is the mass of the particle, v is the velocity of the particle, and r is the radius of the circle.
Since the Lorentz force and the centripetal force are equal in magnitude and opposite in direction, we can equate the two equations to get:
q(v × B) = mv^2/r
Rearranging the equation and solving for q gives:
q = mv^2/(rB)
Since the particle is moving in the counter-clockwise direction, the velocity vector v is directed tangentially to the circle, and the magnetic field vector B is directed out of the page. The cross product of these two vectors is directed towards the center of the circle, which means that the charge of the particle must be positive in order for the Lorentz force to be directed towards the center of the circle.
Therefore, the charge of the particle in this situation is positive.
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2. A freight train traveling with a velocity of −4.0 m/s begins backing into a train yard. If the train’s average acceleration is −0.25 m/s2, what is the train’s velocity after 14s?
Answers
According to the given statement is the train’s velocity after 14s is -7.5 m/s.
What is defined as velocity?The path of a body or entity's movement is determined by its velocity. In its basic form, velocity is a scalar quantity. In definition, velocity is a vector quantity. It is the speed where at ’s dimensional. It is the migration change rate.
Briefing:Initial velocity of the train, u = -4.0 m/s
Acceleration of the train, a = -0.25 m/s²
Time of motion of the train, t = 14 s
The following formula is used to determine the train's final speed:
v = u + at
v is the final velocity of the train
v = -4.0 + (-0.25 x 14)
v = -4.0 - 3.5
v = -7.5 m/s
Therefore, the train velocity of the train is -7.5 m/s.
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A(n) telescope requires a convex lens to gather and focus light that enters from distant objects.
A. optical
B. refracting
C. reflecting
D. digital
Answers
a 65.0-kg boy and 40.0-kg girl, both wearing skates, face each other at rest on a skating rink. the boy pushes the girl, sending her eastward with a speed of 4.00 m/s. describe the subsequent motion of the boy.
Answers
6.5 m/s is the velocity of the boy when a 65.0-kg boy and 40.0-kg girl, both wearing skates, face each other at rest on a skating rink.
Mass of the boy, = 65kg
girl's mass given , = 40 kg
Final velocity of the girl , = -4.00 m/s
By law of conservation of momentum
\(m_bv_ib+m_gv_ig=m_bv_fb+m_gv_fg\)
\(0=65kg(-4.0m/s)+40kgv_fg\)
\(v_fg=6.5m/s\)
When a body is travelling in a straight line, its velocity is the "rate of change of displacement with relation to time."Because it always has a direction, velocity is a vector. As a result, when the displacement to time ratio for linear velocity is determined, it provides both the direction and the magnitude.
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A car is accelerating to the right. In which direction is the applied force?
right
left
up
down
Answers
Answer:
Left
Explanation:
The force is applied opposite of the acceleration.
Mr. Starr pushed a cart full of groceries to his car. After emptying the cart, he pushed it back to the store. He pushed the cart
at a speed of 2 meters per second each way. Which is the best prediction? (1 point)
The cart had the same kinetic energy going each way.
The cart's kinetic energy depends on Mr. Starr's mass.
When it was empty, the cart had less kinetic energy.
When it was full, the cart had less kinetic energy.
Answers
Answer:
The shopping cart has less kinetic energy when it is empty.
Explanation:
When an object of mass \(m\) travels at a speed of \(v\), the kinetic energy of that object would be \((1/2)\, m\, v^{2}\).
In this question, the speed of the shopping cart is fixed (\(v = 2\; {\rm m\cdot s^{-1}}\).) Kinetic energy would be proportional to the mass \(m\) of the shopping cart (including that of its contents.)
The mass of the shopping cart is lower when it is empty on the way back to the store. Therefore, the kinetic energy of the shopping cart would also be lower than when it was full.
Answer:
(Question) A city gets its electricity from a dam, where water is stored in a reservoir. How does the water provide the city with its power?
(Answer) Potential energy in the water becomes kinetic energy as it moves through turbines, which turn kinetic energy into mechanical energy that spins a generator, which changes mechanical energy into electricity.
(Question) An acorn rolls off a roof and falls to the ground. Which statement best describes the change in energy?
(Answer) The acorn’s potential energy decreases as its kinetic energy increases.
(Question) An airplane carries 320 passengers from Phoenix to Los Angeles flying at an average speed of 490 miles per hour. On the return flight, the plane carries 164 passengers and travels at the same average speed. What happens to the plane’s kinetic energy?
(Answer) On the return flight, the plane has less kinetic energy.
(Question) A racehorse is running at 42 miles per hour, equivalent to 18.8 meters per second. The horse and its jockey have a combined mass of 512 kilograms. How much kinetic energy do they have?
(Answer) 90,480.6 J
(Question) Which object has kinetic energy?
(Answer) balloon rising in the sky
(Question) Mr. Starr pushed a cart full of groceries to his car. After emptying the cart, he pushed it back to the store. He pushed the cart at a speed of 2 meters per second each way. Which is the best prediction?
(Answer) When it was empty, the cart had less kinetic energy.
(Question) A student fires a toy rocket into the sky. When does the rocket have the most potential energy?
(Answer) when the rocket reaches its highest point
(Question) What is the best description of one billiard ball hitting a second billiard ball?
(Answer) Most of the kinetic energy in the first ball is transferred to the second ball.
(Question) A roller-coaster car is at the top of a hill. The car and its passengers have a combined mass of 1,088 kilograms. If the hill is 62 meters tall, how much potential energy does the car have?
(Answer) 661,068.8 J
(Question) A roller-coaster is at the top of a 62-meter hill. The car and its passengers have a total mass of 1,088 kilograms. By the time the car reaches the bottom of the hill, its speed is 74 miles per hour (33 meters per second). How much kinetic energy does the car have at the bottom of the hill?
(Answer) 592,416 J
(Question) A diagram is drawn showing a swing set with a swing pulled backward prior to release. The diagram shows how the swing will move forward and then backward after it is initially released. At which point in the diagram is all of the energy gravitational potential energy?
(Answer) when the swing is pulled back prior to release
(Question) essay
(Answer) good luck
(Question) essay
(Answer) good luck
Explanation:
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