a 5.00 kg stone is rubbed across the horizontal ceiling of a cave passageway (fig. 6-48). if the coefficient of kinetic friction is 0.65 and the force applied to the stone is angled at u ???? 70.0°, what must the magnitude of the force be for the stone to move at constant velocity?
Answers
We take the +x direction to be horizontal to the right and the +y direction to be up.
Newton’s second lawThe equations for the x, y components of the force as per Newton’s second law are:
Fx=Fcosθ−f=ma
Fy=Fsinθ−FN−mg=0
Now, f=μkFN and the second equation from above gives
FN=Fsinθ−mg,
which yields f=μk(Fsinθ−mg).
This expression is replaced for f in the first equation to obtain
Fcosθ−μk(Fsinθ−mg)=ma.
For a = 0 ,
the force is F= cosθ− μksinθ− μkmg
With μk=0.65, m = 5.0kg,
and θ = 70∘, we obtain F = 118 N.
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Related Questions
How can parallax allow us to determine the distance to a star
Answers
Answer:
Astronomers use a method similar to the one you used with your homemade quadrant. Twice the distance to the Sun, divided by the distance to the star (which is unknown so far) is equal to the tangent of the parallax angle of the star.
According to "Take a Closer Look", what type of lens does a camera contain? science
Answers
Answer:
convex write convex only don't write convex lens
Explanation:
what is the magnitude e of the electric field at the point on the x axis with x coordinate a/2?
Answers
According to Coulomb's law, the electric field's strength is provided by the formula E1=KQ\(_{2}\) =Kq\(_{1}\), where Q is the source charge on the x-axis.
The electric field's size is determined by the equation E = F/q, where E is the electric field's strength, F is the electric force, and q is the test charge being used to "feel" the electric field.
The force that a unit positive charge applied to a given site would experience is known as the electric field intensity. A vector quantity is electric field intensity. 'E' stands for it. Electric field is calculated as F/q. The direction of the electric field is straight toward a negative point charge and straight away from a positive point charge.
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four resistance of resistance 1 resistance, 2 resistance,3 resistance are connected in series and afterwards in parallel. Calculate the combined resistance in each case.
Answers
In series: The combined resistance is equal to the sum of the individual resistances (R_total = R1 + R2 + R3).
In parallel: The combined resistance is the reciprocal of the sum of the reciprocals of the individual resistances (1/R_total = 1/R1 + 1/R2 + 1/R3).
When resistors are connected in series, their resistances add up to give the total resistance. In this case, the combined resistance in series would be the sum of the individual resistances: R_total = R1 + R2 + R3.
On the other hand, when resistors are connected in parallel, their reciprocals sum up to give the inverse of the total resistance. In this case, the formula for calculating the combined resistance in parallel is: 1/R_total = 1/R1 + 1/R2 + 1/R3.
Let's assume the resistance values are R1 = 1 ohm, R2 = 2 ohms, and R3 = 3 ohms.
For the series connection: R_total = R1 + R2 + R3 = 1 + 2 + 3 = 6 ohms.
For the parallel connection: 1/R_total = 1/R1 + 1/R2 + 1/R3 = 1/1 + 1/2 + 1/3 = (6 + 3 + 2) / 6 = 11 / 6. Taking the reciprocal of both sides, we get R_total = 6 / 11 ohms.
Therefore, the combined resistance in the series connection is 6 ohms, while in the parallel connection, it is 6/11 ohms.
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what is the value of resistor r in the figure(figure 1) if δv=8v and i=6a?
Answers
The value of the resistor is 24Ω.
A resistor is a passive two-terminal electrical component used in circuits to implement electrical resistance. Resistors have a variety of purposes in electronic circuits, including lowering current flow, adjusting signal levels, dividing voltages, biassing active components, and terminating transmission lines.
We are given that,
Voltage = δv =8v
Current = i =6a
So that , the resistance can be calculated by the formula by,
R = Vi
R = 8v × 6a
R = 24 Ω
Therefore , the of resistor would be 24Ω.
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Partially correct answer icon Your answer is partially correct. An electron starts from rest in a vacuum, in a region of strong electric field. The electron moves through a potential difference of 28 volts. What is the kinetic energy of the electron in electron volts (eV)
Answers
The kinetic energy of the electron in electron volts (eV) after moving through a potential difference of 28 volts is approximately 28 eV.
The kinetic energy of an electron can be calculated using the equation:
Kinetic Energy (KE) = qV
Where q is the charge of the electron and V is the potential difference.
The charge of an electron is approximately -1.6 x 10⁻¹⁹ coulombs.
Given that the potential difference is 28 volts, we can substitute the values into the equation:
KE = (-1.6 x 10⁻¹⁹ C) * (28 V)
Simplifying the calculation:
KE ≈ -44.8 x 10⁻¹⁹ J
To convert the energy to electron volts (eV), we can use the conversion factor:
1 eV= 1.6 x 10⁻¹⁹ J
Therefore:
KE ≈ (-44.8 x 10⁻¹⁹ J) / (1.6 x 10⁻¹⁹ J/eV)
KE ≈ -28 eV
Since kinetic energy is always positive, we can disregard the negative sign and state that the kinetic energy of the electron is approximately 28 eV.
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Warm 12 grams of water from 98 degrees Celsius to 99 degrees Celsius
Answers
Answer:
E=mc△T
E=0.012(4200)(99-98)
E=50.4J
50.4 joules of heat is used
state how heat loss by radiation is minimized in a thermos flask
Answers
What is the wavelength of a wave with f = 0. 9 hz and v = 154. 9 cm/s? to check, set frequency to 0. 90 hz, tension to 2. 4 n, and density to 1. 0 kg/m.
Answers
A wave has a 1.72 m wavelength.
A wavelength simple definition: What is it?A waveform signal's wavelength is defined as the separation between two identical points (adjacent crests) in adjacent cycles as the signal travels through space or along a wire. This length in wireless systems is typically specified in meters (m), centimeters (cm), or millimeters (mm).
Given,
Frequency, f = 0.9 Hz
The velocity of a wave is 154.9 cm/s, or 1.549 m/s.
v = f λ
λ = v/f
λ = 1.549/0.9
λ = 1.72m.
So a wave has a 1.72 m wavelength. This is the necessary solution as a result.
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A
is the order in which things are arranged.
O plan
sequence
O process
O goal
Answers
Answer:
sequence
Explanation:
sequences are the way in which things are ordered, for example: 1, 2, 3, 4 is a sequence:)
(b) In an x-ray twbe, an electron is accelerated from rest towards a metal farget tyy a 30 kV source. Calculate the kinetic energy of the electron. e=1.6\times 10^(-19)C
Answers
The kinetic energy of the electron accelerated by a 30 kV source is approximately 4.8 x 10^(-14) Joules.
Voltage (V) = 30 kV = 30,000 volts
Charge of an electron (e) = \(1.6 x 10^(-19) C\)
Calculating the potential energy -
P = e x V
An object's motion gives it kinetic energy, which is a type of energy. It is described as the amount of effort required to accelerate a body of a specific mass from rest to its specified velocity. As Potential energy is equal to kinetic energy, therefore calculating the kinetic energy:
Potential Energy = Kinetic Energy = e x V
Substituting the value -
\(= (1.6 x 10^(-19) C) x (30,000 V)\)
\(= 4.8 x 10^(-14) J\)
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A meterologist made these observations one day:
• In the morning, anocean wave hit a shoreline every 15 seconds.
• In the afternoon, an ocean wave hit the shorlinie every 30 seconds.
Identify whether the ocean waves transferred more or less energy in the morning than in the afternoon.
Write your answer in complete sentences.
Answers
Answer:
They transfered more energy in the morning.
Explanation:
This is because, let me put this in simple words, you have more energy, you can run more laps around the track, right? This is the same with the waves. They have more energy, so they can crash aganst the shore more!
6. How much less is the sun' tide-generating force less than the moon's and why is it less?
Answers
Answer: However, the sun is 390 times further from the Earth than is the moon. Thus, its tide-generating force is reduced by 3903, or about 59 million times less than the moon. Because of these conditions, the sun's tide-generating force is about half that of the moon (Thurman, H.V., 1994).
Explanation:
i need help with this question really urgent
Answers
Answer:
Cost Per Hour:
132.0000
Cost Per Day:
39600.0000
Cost Per Month:
1204632.00
Cost Per Year:
14455584.00
kWh Per Day:
3600.00
A 2500-kg car is being pushed up a hill at an angle of 35 degrees. Determine the gravitational
force pulling down on the car if it is accelerating up the hill at a rate of 5 m/s/s.
Answers
Answer:
The force that pulls the car down is Wₓ = 14052.6 N and the one that pushes the car up is F = 26552.6 N
Explanation:
For this exercise we will use Newton's second law, let's set a reference system where the x axis is parallel to the plane, in the adjoint we can see the forces in the system.
sin 35 = Wₓ / W
cos 35 = W_y / W
Wₓ = W sin 35
W_y = W cos 35
Wₓ = 2500 9.8 sin 35
Wₓ = 14052.6 N
let's write the equations for each axis
and
Y axis
N-W_y = 0
N = W_y
X axis
F -Wₓ = m a
F = Wₓ + m a = mg sin 35 + m a
F = m (a + g sin 35)
let's calculate
F = 2500 (5 + 9.8 sin 35)
F = 26552.6 N
The force that pulls the car down is Wₓ = 14052.6 N and the one that pushes the car up is F = 26552.6 N
how to find total internal reflection
Answers
(c) Total internal reflection occurs
when the incident angle is greater than the critical angle.
n1 sin θ1 = n2 sin θ2. n1 sin θ1 = n2.hope it helpsIf the specific gravity of cooking oil is 0.784, what is the density of the cooking oil. [The density of water at the same temperature as the cooking oil is 1.02 g/mL.]
Answers
The density of the cooking oil is approximately 0.800 g/mL, calculated using a specific gravity of 0.784 and the density of water (1.02 g/mL).
The specific gravity of a substance is the ratio of its density to the density of a reference substance, usually water. In this case, the specific gravity of the cooking oil is given as 0.784.
Specific gravity = Density of cooking oil / Density of water
We are given the density of water as 1.02 g/mL. Rearranging the equation, we can solve for the density of the cooking oil:
Density of cooking oil = Specific gravity × Density of water
Density of cooking oil = 0.784 × 1.02 g/mL
Density of cooking oil ≈ 0.800 g/mL
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f) if the red laser has a wavelength of 633 nm, what is the speed and wavelength of the red light in the plastic?
Answers
The speed of light in a medium, such as plastic, is given by the equation v = c/n, where v is the speed of light in the medium, c is the speed of light in vacuum (approximately 3 x 10^8 m/s), and n is the refractive index of the medium. To determine the speed of red light in plastic, the refractive index of the specific plastic material must be known.
The wavelength of light in a medium can be determined using the equation λ = λ0/n, where λ is the wavelength of light in the medium, λ0 is the wavelength of light in vacuum, and n is the refractive index of the medium. Given that the red laser has a wavelength of 633 nm (633 x 10^-9 m) in vacuum, the wavelength of red light in plastic can be calculated using the refractive index of the plastic material.
In conclusion, to determine the speed and wavelength of red light in plastic, the specific refractive index of the plastic material needs to be known.
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John doesn't think that skepticism should play an important role in the scientific process. He says that skepticism interferes with scientific consensus. Which statement best describes John's conclusion
Answers
Answer: it is incorrect because skepticism helps scientists recognize when ideas are not supported by evidence.
Explanation:
Skepticism is simply the understanding that there can be uncertainty when it comes to knowledge in certain areas.
From the question, we are informed that John doesn't think that skepticism should play an important role in the scientific process and that he says that skepticism interferes with scientific consensus.
The statement that best describes John's conclusion is that it is incorrect because skepticism helps scientists recognize when ideas are not supported by evidence.
When the height of the cylinder increased by a factor of 5, from 100 m to 500 m, what happened to the cylinder’s gravitational potential energy?
Answers
Answer: It increased by a factor of 5
Explanation:
Gravitational potential energy is given by the following formula:
an object with a mass of 5.0 kg accelerates 9.0 m/s² when an unknown force is applied to it
Answers
Answer:
please thanks
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2. Fill in the blanks with appropriate words.
a. The force which acts towards the centre is called .......
force.
Answers
Answer:
centripetal force
Explanation:
because this force always compels the body to move in circle
I just need to make sure about 7, 8, 9 if it is right
Answers
7)
The internal angles of a triangle must add up to 180.
The given answer is 64º and we can verify that:
\(64+26+90=180\)Then, the answer is correct.
Notice that the measurement of 26.0º has three significant figures while the 90º angle is an exact value. Then, the answer must have 3 significant figures too: 64.0º.
8)
The tangent of an angle in a right triangle is the quotient between the side opposite to it and the side adjacent to it.
The tangent of 26º is 0.4877, and the quotient of the lengths of the sides according to the answer, is:
\(\frac{8.00\operatorname{cm}}{16.4\operatorname{cm}}=0.488\ldots\)The length of 16.4cm has the correct number of significant figures and matches the value of the tangent. Then, the answer is correct.
9)
Using the Pythagorean Theorem, we should verify that:
\(\begin{gathered} (18.3\operatorname{cm})^2=(8.00\operatorname{cm})^2+(16.4\operatorname{cm})^2 \\ \Rightarrow335cm^2=64.0\operatorname{cm}+269\operatorname{cm} \\ \Rightarrow335\operatorname{cm}^2=333\operatorname{cm} \end{gathered}\)To be precise, if the length of the hypotenuse is calculated, the result is 18.249...cm, so it should be rounded down to 18.2cm.
Water can form large dewdrops in nature. How could dewdrops make of salt water be different?
Answers
Answer: The answer is option D.
2 Stefan pushes a cart with three books so it
just reaches the end of a track. Next, he
puts six books onto the cart. Which claim
explains what he must do so that the cart
reaches the end of the track?
F use less force
Guse more force
(H) use the same amount of force
O use a different cart
5 Alonso uses a stretched rubber band to
propel a toy car across a flat surface. What
force makes the car roll forward?
A
B
a push from the air
the pull of gravity
Ca push from Alonso's hand
Da push from the rubber band
Answers
The force that makes the car roll forward in Alonso's case is (C) a push from Alonso's hand. When Alonso stretches the rubber band and releases it, the stored potential energy is converted into kinetic energy, causing the rubber band to push the car forward.
Each of the following is a factor that determines radiation injury EXCEPT one. Which one is the EXCEPTION?a. Size of the irradiated areab. Amount of radiationc. Patient genderd. Dose rate
Answers
The factor that determines radiation injury EXCEPT one is c. patient gender.
Factors that determine radiation injuryRadiation injury occurs when a person is exposed to high levels of ionizing radiation. The size of the irradiated area, the amount of radiation, and the dose rate are all factors that determine radiation injury, but patient gender is not. While patient gender may play a role in other aspects of healthcare, it does not determine the amount of radiation injury a person may experience. Therefore, the correct answer is c. Patient gender.
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The process of blood cell formation is known as ?
Answers
ita called hematopoiesis
If an object has a mass of 8 kg, what is its approximate weight on Earth?
Answers
Answer:
10^24 kg
Explanation:
Which of the following represents a chemical change? (1 point)
Answers
Answer:
D
Explanation:
Splitting water into hydrogen and oxygen***
A Van De Graaf generator is an electrostatic generator and may collect a large enough charge to produce
a(n) _____.
electric current
electric field
electrostatic induction
coulomb of electricity
Answers
A Van De Graaf generator is an electrostatic generator and may collect a large enough charge to produce an electric current. Option A.
A Van de Graaff generator is an electrostatic generator that uses a moving belt to store charge in hollow metal spheres on insulating posts, producing very high potentials. Produces direct current (DC) at low currents and very high voltages.
Van de Graaff generator the motor turns silicone rollers to move rubber bands. As the belt moves, electrons are transferred from the rubber belt to the silicone roller charging the belt positively and the roller negatively. Van de Graaff generators extract electrons from the Earth move them along belts and store them in large spheres. These electrons repel each other and try to separate as much as possible by spreading over the surface of the sphere.
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