Answer:
It is because of the blood pressure balances with our atmospheric pressure
a disc is at rest. a piece of clay collides with the edge of the disc and sticks, causing it to rotate clockwise around the frictionless axle at its center.
When a piece of clay collides with the edge of a stationary disc and sticks, it causes the disc to rotate clockwise around its frictionless axle at the center.
The collision between the piece of clay and the edge of the disc results in the transfer of angular momentum from the clay to the disc. Initially, the disc is at rest, so its angular momentum is zero. However, when the clay sticks to the disc, it adds its own angular momentum to the system. According to the law of conservation of angular momentum, the total angular momentum of the system remains constant.
The clay's angular momentum is nonzero because it has a tangential velocity due to its collision with the edge of the disc. By sticking to the disc, the clay transfers this angular momentum to the disc, causing it to start rotating. Since the clay collides with the edge and sticks, it exerts a torque on the disc, resulting in the disc's clockwise rotation around its frictionless axle. The rotational motion of the disc continues until an external torque is applied to the system or until the disc's angular momentum is dissipated through friction or other means.
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When a piece of clay collides with the edge of a stationary disc and sticks, it causes the disc to rotate clockwise around its frictionless axle at the center.
The collision between the piece of clay and the edge of the disc results in the transfer of angular momentum from the clay to the disc. Initially, the disc is at rest, so its angular momentum is zero. However, when the clay sticks to the disc, it adds its own angular momentum to the system. According to the law of conservation of angular momentum, the total angular momentum of the system remains constant.
The clay's angular momentum is nonzero because it has a tangential velocity due to its collision with the edge of the disc. By sticking to the disc, the clay transfers this angular momentum to the disc, causing it to start rotating. Since the clay collides with the edge and sticks, it exerts a torque on the disc, resulting in the disc's clockwise rotation around its frictionless axle. The rotational motion of the disc continues until an external torque is applied to the system or until the disc's angular momentum is dissipated through friction or other means.
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PLEASE HELP 20 POINTS
A car of mass 700 kg and moving at a speed of 30 m/s collides with a stationary truck of mass 1400 kg, and the two vehicles lock together on impact. The combined velocity of the car and truck after the collision is m/s.
At time t=0 , in your frame of reference Z, you measure the back of the spaceship to be at x=0 and the front of the ship to be at x=l . Find an equation relating the length that you measure l to the ship's proper length l0 .
An equation relating the length that you measure l to the ship's proper length l0 is
l =l0/y. This is further explained below.
What is an equation relating the length that you measure l to the ship's proper length l0?Generally, Any object's length in a moving frame will look shortened or contracted when seen in that direction. The Lorentz transformation may be used to determine the amount of contraction.
In conclusion, To use the Lorentz Lorentz transformation, the length Lo-x2 - may be determined if it is measured in the moving reference frame. Hence the Resultant l = l0/y.
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the unit for force is which of the following A. n B. kg
C. nm
D. j
The unit for force is D. N (Newton). It is named after Sir Isaac Newton, a renowned physicist and mathematician who formulated the laws of motion.
Force is a physical quantity that describes the interaction between objects and their ability to cause acceleration or deformation. The Newton (N) is the standard unit for force in the International System of Units (SI). It is named after Sir Isaac Newton, a renowned physicist and mathematician who formulated the laws of motion.
While the options you provided include units such as n (lowercase), kg, nm, and j, none of them represent the standard unit for force. "n" is not a recognized unit for force, "kg" is the unit for mass, "nm" represents the unit for torque (Newton meter), and "j" typically stands for joule, the unit for energy. Therefore, the correct unit for force is the Newton (N).
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F norm = 20 N
F grav = 20 N
what is the net force of thia object ?
Answer:
The net force of the object is 0 N, as both forces are acting in the opposite direction so they will cancel each other...
Why do we use water displacement ?
Answer:
To determine the density of an unknown object
What is the correct definition of a rarefaction?
A: region of zero pressure in a medium caused by a passing wave
B: region of low pressure in a medium caused by a passing wave
C: region of low altitude in a medium caused by a passing wave
D: region of high pressure in a medium caused by a passing wave
Answer: B
Explanation:
If Usain Bolt runs at a speed of 12 m/s for 100 seconds, how far did Usain Bolt run in meters
The distance covered by Usain Bolt in meters is 1200 meter.
Speed is defined as the distance travelled or covered in a particular time period. Speed is a scalar quantity as it does not specify the direction of motion, whereas velocity is the vector counterpart of speed as velocity specifies the direction of motion of the object or body or anything concerned with the motion.
Speed is given by the equation,
speed= distance traveled/time taken --- equation(1)
so we can calculate distance from equation(1) as ,
distance traveled= speed × time taken --- equation(2)
here,
speed is given as 12 m/s and time taken is given as 100 seconds
Therefore from equation(2)
distance traveled = 12m/s×100s=1200m
that is , the distance covered by Usain Bolt is 1200 meters.
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The mechanical advantage of a pulley ytem i 4. 0. Uing thi pulley ytem, how much force do you need to exert to lift a 500. 0N box?
The force exerted to push a box of 500 N is equal to
What is the mechanical advantage?The mechanical advantage can be demonstrated as the ratio of the output force to the input force. The mechanical advantage can be calculated by the ratio of the forces involved to accomplish the work.
The ratio of the resistance force and effort is known as the actual mechanical advantage which can be comparatively less. The efficiency of a machine can be calculated by equating the ratio of its output to its input.
Given the weight of the box = 500 N
The mechanical advantage of a pulley = 4.0
Mechanical advantage = Load/Effort
Input force or exerted force = Load/ M.A.
Exerted force = 500/4 = 125 N
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What distance will the walker travel if he walks at 3.0 miles per hour for 1 hour and 20 minutes?
Answer:
The walker travelled 3.6 miles.
Explanation:
d = vt
(v is velocity or speed and t is time, and d is distance.)
d=(3.0 mph)(1.2)
Leave the time in hours, since the unit for the speed is miles per hour.
d=3.6 miles
The distance will the walker travel if he walks at 3.0 miles per hour for 1 hour and 20 minutes is 3.6 km.
What is distance?Distance is defined as the entire path traveled by an object in motion, regardless of path direction. The distance is symmetric, which means that for any two points P1 and P2, the distance between them is equal to the distance between them, or d(P1, P2) = d(P2, P1). 3. The triangle inequality is a less visible feature of the distance function. P1 for any point. The quantity of meters in a vector unit is the distance factor.
Distance = velocity x time
Given velocity = 3.0 miles per hour
Time = 1.2 hour
Distance = 3.0 x 1.2
Distance = 3.6 km/hour.
Thus, the distance will the walker travel if he walks at 3.0 miles per hour for 1 hour and 20 minutes is 3.6 km.
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When static electricity is created with the balloon, what happens when the charges try to move back together?
When static electricity is created with a balloon, it involves the separation of electric charges. This occurs when the balloon rubs against another object, such as hair or clothing, causing the transfer of electrons. The rubbing action causes electrons to be transferred from one object to the other, resulting in a buildup of positive charges on one object and negative charges on the other.
In the case of a balloon being rubbed against hair, for example, the balloon becomes negatively charged (excess electrons) while the hair becomes positively charged (deficit of electrons). These opposite charges create an electric field between the balloon and the hair, causing an attraction between them.
When the charges try to move back together, they are essentially trying to neutralize the separation of charges and restore electrical balance. In this case, the excess electrons on the balloon and the deficit of electrons on the hair want to redistribute and reach a state of equilibrium.
The movement of charges back together can occur through various mechanisms, such as:
1. Discharge: If the pathway for charges to flow between the objects is available, such as through a conductor, the excess electrons on the balloon can flow towards the hair, neutralizing the charges. This discharge can result in a small electric shock or spark.
2. Induction: The charges can also redistribute through the process of induction, where the electric field of the charged balloon induces opposite charges in the hair without direct contact. This can cause the hair strands to be attracted to the balloon, as they acquire a slight positive charge.
In either case, the charges will move back together until the separation is minimized or eliminated. The movement of charges is driven by the principle of electrical attraction and the tendency to reach a state of electrical balance.
It is important to note that the movement of charges back together is a temporary phenomenon in the case of static electricity. Once the charges have neutralized, the objects will no longer exhibit static electricity unless another separation of charges occurs through rubbing or other mechanisms.
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Moe is playing with a yo-yo. He throws the yo-yo down and then pulls it back up. The motion of the yo-yo is represented by the equation y=2x^2−4.8x
, where x represents the number of seconds since the yo-yo left Moe's hand, and y represents the vertical height in inches of the yo-yo with respect to Moe's hand. Note that when the yo-yo is in Moe's hand, y = 0, and when the yo-yo is below his hand, y is negative. a. How long is Moe's yo-yo in the air before it comes back to Moe's hand? Write and solve a quadratic equation to find the times that the yo-yo is in Moe's hand. b. How long does it take for the yo-yo to turn around, that is, to start its return to his hand? Use what you know about parabolas to help you. c. How long is the yo-yo's string? That is, what is y when the yo-yo changes direction? d. Draw a sketch of the graph representing the motion of Moe's yo-yo. On the sketch, label the important points: when the yo-yo is in Moe's hand and when it changes direction.
Answer:
30is the answer but it wa seasy
calculate the time taken to raise the temperature of 1.5 kg of water in a kettle from 15°C to 100°C given that specific heat capacity of water is 4200 J/kg/K and the heater is rated 250V , 2kW
Answer:
270 s or 4.5 min
Explanation:
First find the amount of heat needed:
q = mCΔT
q = (1.5 kg) (4200 J/kg/K) (100 − 15) K
q = 535,500 J
q = 535.5 kJ
Power is energy per time.
P = E / t
2 kW = 535.5 kJ / t
t = 270 s
PLS HELP! I’ll give Brainly!
What source of energy drives the water cycle?*
1 Earth's rotation
2 Earth's gravity
3 Circulation of ocean waves
4 The Sun
needs to go—energy, or heat.
please follow me mark me as brainlist
Answer:
4
Explanation:
water cycle is driven primarily by the energy from the sun
A light beam with a 70° angle of incidence travels through a medium with an index of refraction of 1.8. The light enters a second medium and has an angle of refraction of 37°. What is the index of refraction of the second medium?
Answer:
Explanation:
For refraction , the formula is
sin i / sin r = μ₂ / μ₁
where light is travelling from medium 1 to 2 having refractive index of μ₁ and μ₂ . Angle of incidence in medium 1 is i and angle of refraction in medium 2 is r .
Here i = 70°, r = 37°
μ₁ = 1.8 ,μ₂ = ?
sin70 / sin 37 = μ₂ / 1.8
.939 / .602 = μ₂ / 1.8
1.56 = μ₂ / 1.8
μ₂ = 2.81 .
The value of refraction index for the second medium will be \(\mu_2=2.16\)
What will be the refractive index?Every material has a different refractive index. The refracted index of any material shows that the light is refracted by how much angle.
So like for water its value will be different also for glass its value will be different.
Now it is given in the question that
Angle of incidence \(i=70^o\)
Refractive index of the first medium \(\mu_1=1.8\)
Angle of refraction \(r=37^o\)
Now from snells law
\(\dfrac{Sin \ i}{Sin \ r} = \dfrac{\mu_2}{\mu_1}\)
\(\dfrac{Sin70}{Sin37} = \dfrac{\mu_2}{1.8}\)
\(\mu_2= \dfrac{Sin70\times1.8}{Sin37}\)
\(\mu_2=2.16\)
Thus the value of the refraction index for the second medium will be \(\mu_2=2.16\)
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You walk 100m due north. You then turn and walk 55m due east. You then make another turn and walk 12m due south. What is the resultant vector for your walk?
Answer:
Explanation:
Important here is to know that due north is a 90 degree angle, due east is a 0 degree angle, and due south is a 270 degree angle. Then we find the x and y components of each part of this journey using the sin and cos of the angles multiplied by each magnitude:
\(A_x=100cos90\\A_x=0\\B_x=55cos0\\B_x=55\\C_x=12cos270\\C_x=55\)
Add them all together to get the x component of the resultant vector, V:
\(V_x=55\)
Do the same to find the y components of the part of this journey:
\(A_y=100sin90\\A_y=100\\B_y=55sin0\\B_y=0\\C_y=12sin270\\C_y=-12\)
Add them together to get the y component of the resultant vector, V:
\(V_y=88\)
One thing of import to note is that both of these components are positive, so the resultant angle lies in QI.
We find the final magnitude:
\(V_{mag}=\sqrt{55^2+88^2}\) and, rounding to 2 sig dig's as needed:
\(V_{mag}=\) 1.0 × 10² m; now for the direction:
\(\theta=tan^{-1}(\frac{88}{55})=\) 58°
at what speed will the momentum of a proton (mass 1.0 u ) equal that of an alpha particle (mass 4.0 u ) moving at 0.20 c ?
The speed at which the momentum of a proton equals that of an alpha particle moving at 0.20c is approximately 1.45x10⁸m/s.
The momentum (p) of a particle is given by the product of its mass (m) and velocity (v), i.e. p = mv. The momentum of a proton is equal to that of an alpha particle when they have the same magnitude of momentum.
The momentum of an alpha particle (mass 4.0 u) moving at 0.20c can be calculated as follows:-:
p_alpha = m_alpha * v_alpha = (4.0 u) * (0.20c) = (4.0 u) * (0.20 * 3.00x10⁸ m/s) = 2.40x10⁻¹⁹ kg m/s
To find the velocity (v_p) at which a proton (mass 1.0 u) has the same momentum, we can set the momentum of the proton equal to that of the alpha particle:
p_proton = m_proton * v_proton = p_alpha = 2.40x10^-19 kg m/s
Solving for the velocity of the proton gives:
v_proton = p_alpha / m_proton = (2.40x10^-19 kg m/s) / (1.0 u * 1.66x10^-27 kg/u) = 1.45x10^8 m/s
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What's the real power of a purely resistive circuit in which the RMS voltage measures 80 volts and the RMS current measures 5 amps?
A. 85 watts
B. 120 watts
C. 240 watts
D. 400 watts
Answer:
D.400 watt
Explanation:
B/c Pave=IrmsVrmsPave=(5)(80)Pave=400 wattwhere Pave = average power
Irms=RMS current &
Vrms=RMS voltage
If we know the mass of an object in kilograms, and we know the
acceleration that an object experiences then we can calculate the force
exerted on that object by multiplying the
force, mass
mass, acceleration
O acceleration, force
chino
none of the above
Answer:
Mass, acceleration
Explanation:
Force= Mass (kg) *acceleration (m/s^2)
A person is lifted 24 meters by the elevator in a building. If the
person has a mass of 74 kg, what is the gravitational potential
energy gained by the person? Estimate g to 9.81 and keep 5
significant figures.
Answer: 17,423 J
Explanation:
Potential Energy = mass x gravity x height
PE = 74kg x 9.81m/s^2 x 24 m
PE = 17,423 J
The required value of gravitational potential energy gained by the person is 17422.56 J.
Given data:
The lifting height is, h = 24 m.
The mass of person is, m = 74 kg.
The energy possessed by the person by virtue of its position is known as gravitational potential energy of the person. The expression for the gravitational potential energy of person is given as,
U = mgh
Here,
g is the gravitational acceleration.
Solving as,
\(U = 74 \times 9.81 \times 24\\\\U =17422.56\;\rm J\)
Thus, we can conclude that the required value of gravitational potential energy of person is 17422.56 J.
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19. The continuity equation for compressible liquid can be written as
Answer:The continuity equation for a compressible liquid is a mathematical expression that relates the changes in fluid density, velocity, and volume to the changes in time. This equation can be written as:
∂ρ/∂t + (ρv)•∇ = 0
where:
ρ = fluid density
v = fluid velocity
∂/∂t = partial derivative with respect to time
∇ = del operator
The continuity equation expresses the principle of mass conservation, stating that the rate of change of fluid density in a fixed volume must be equal to the rate of flow of fluid into or out of that volume. This equation is commonly used in fluid dynamics to study the behavior of liquids and gases in various applications, such as in pipelines, pumps, valves, and compressors.
Explanation:
12 A car travels in a straight line at speed v along a horizontal road. The car moves
against a resistive force F given by the equation
F = 400+kv²
where F is in newtons, v in ms-1 and k is a constant.
At speed v = 15ms-1, the resistive force F is 1100 N.
a
Calculate, for this car:
i the power necessary to maintain the speed of 15ms-¹,
ii the total resistive force at a speed of 30 ms-¹,
iii the power required to maintain the speed of 30ms-¹.
Answer:
i) Power = Force * Velocity = 1100 * 15 = 16500 W = 16.5 kW(ii) Find the value of k first: F = 400 + k(15^2) k = 28/9 F = 400 +(28/9)(30^2) = 320
Explanation:
A force F~ = Fxˆı + Fyˆ acts on an object with Fx = 4 N and Fy = 6 N. The angle between F~ and the displacement vector ~s is 18◦ , and 106 J of work is done by F~. Find the magnitude of ~s. Answer in units of m
The magnitude of the vector displacement is 15.65 m.
Resultant force
The resultant force acting on the object is calculated as follows;
\(F = \sqrt{F_x^2 + F_y^2} \\\\F = \sqrt{4^2 + 6^2} \\\\F = 7.21 \ N\)
Displacement of the vectorThe displacement of the vector is calculated as follows;
W = Fs cosθ
\(s = \frac{W}{Fcos(\theta)} \\\\s = \frac{106}{7.12 \times cos(18)} \\\\s = 15.65 \ m\)
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18. A rock is thrown straight upward with an initial velocity of 12.2 m/s from a location where the acceleration due to gravity is 9.8 m/s2. How high up does it go
The height to which the rock can attain is 7.6 m
From the question given above, the following data were obtained:
Initial velocity (u) = 12.2 m/s
Acceleration due to gravity (g) = 9.8 m/s²
Final velocity (v) = 0 m/s (at maximum height)
Maximum height (h) =?The maximum height to which the rock can attain can be obtained as follow:
v² = u² – 2gh (since the rock is going against gravity)
0² = 12.2² – (2 × 9.8 × h)
0 = 148.84 – 19.6h
Collect like terms
0 – 148.84 = – 19.6h
–148.84 = –19.6h
Divide both side by –19.6
h = –148.84 / –19.6
h = 7.6 mThus, the height to which the rock can attain is 7.6 m
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A student designed an experiment to investigate how emergency thermal blankets are used to keep a person warm in a cold environment. The student heated water on a hot plate until it reached a temperature of 100 0C. Equal amounts of the water were quickly transferred to identical containers. One of the containers was wrapped with a layer of aluminum foil and the other with clear plastic wrap. A thermometer was inserted into each container so that they touched only the water. After one hour of observation, the temperature of the water in the aluminum wrapped container was higher than the plastic wrapped container. Specific Heat Material J/kg/0C Aluminum 900 Plastic 1410 Based on the specific heat data, is the observation consistent with predicted results? Why or why not?
From the experiment, it is clear that the data is not consistent with the specific heat data.
What are emergency thermal blankets?Many times we could find ourselves out in the cold or in a very hot environment. Most especially when we find ourselves in the cold environment, there is the need to keep warm so that we can be able to maintain the normal body temperature.
The emergency thermal blankets is one of the materials that have been posited as able to maintain the temperature of the body and it is made of cheap plastic or polyethylene material.
We know that the material that has the higher specific heat should loose heat more slowly but this is shown not to be the case here.
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Assignment Directions:
Write an essay convincing a nonactive person that swimming is beneficial.
Create a swim test.
Assignment Guidelines:
You must have a clear thesis statement; a minimum of 300 words; and three body paragraphs, each about one of the seven benefits listed in the lesson, and a concluding paragraph.
Your test must test the swimmer's ability to demonstrate the proper technique for each of the four strokes. Use the information in the lesson as well as the information from the videos you picked to prepare the test. For each stroke, you must have a list of skills that you will watch for, as you test this imaginary swimmer.
Submission Requirements:
Submit your responses. Please remember to:
submit the assignment question(s) and your responses;
proofread for spelling, grammar, and punctuation;
use complete sentence structure; and
make sure each paragraph has a minimum of six sentences.
Swimming is an exercise that provides strength for muscles and bones. It builds muscle strength, endurance, and cardiovascular disease.
A non-active person should go swimming. Swimming is the best exercise and when you are swimming the bones are oiled up. For the person who is unable to follow the exercise, Swimming offers the best exercise for them. Water offers weightlessness to the human body and eating a healthy lifestyle.
Swimming creates a healthy body and a clear mind. Swimming improves muscle strength and durability. When the legs kick, and move their arms they are building on their muscles. It helps keep your heart healthy. It helps the body to be more flexible. Swimming not only gives physical strength but also gives mental strength and reduces stress levels.
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Two 1.2 kΩ resistors are in series and this series combination is in parallel with a 3.3 kΩ resistor. The total resistance is
Explanation:
you have to divide by 2 and times by 2
describe the movement of a transverse wave please i will give brainliest and the max points
Answer: Movement in which all positions of both the waves rotate around the directions at right angles to the axis of the wave's movement.
Explanation: Hope this help
when the partition is removed, the gas is rushed to fill the entire volume (double of original volume). what is the work done by the gas?
The work done by the gas is equal to the change in its internal energy, which is equal to the energy needed to expand the gas to the new volume.
This work can be calculated using the ideal gas law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature. If we assume the temperature remains constant and the number of moles remains constant, then the work done by the gas is equal to PV, or PV2 - PV1, where PV2 is the final pressure-volume product, and PV1 is the initial pressure-volume product. Thus, the work done by the gas is equal to the difference in the pressure-volume product.
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A vehicle travels a distance of 300km. It took the vehicle 6 hours to make the trip.
What is the speed of the vehicle?
Answer:
50 kmph
Explanation:
300 / 6 = 50