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Amanda [17]
3 years ago
12

8. A physics TA pushes a 20.0 kg cart at a constant velocity 22.0 m down the hall. The force she exerts on the cart is directed

at an angle 26.0° below the horizontal, and the force of friction opposing the motion of the cart is 44.0 N. What is the total work done on the cart?
Physics
1 answer:
Zepler [3.9K]3 years ago
5 0

Answer:

Total work: 0 J

Explanation:

First of all, we have to find the magnitude of the force that is pushing the cart forward.

We can do that by writing the equations of motion along the horizontal direction; we have:

F cos \theta - F_f = ma

where

F cos \theta is the horizontal component of the force of push, where

F is the magnitude of the force

\theta=-26^{\circ} is the angle of the force with the horizontal

F_f=44.0 N is the force of friction

m = 20.0 kg is the mass of the cart

a = 0 is the acceleration, since the cart is moving with constant velocity

Solving for F cos \theta,

Fcos \theta - F_f = 0\\F cos \theta = F_f = 44.0 N

This component of the pushing force is the one doing work on the cart, so the work done on the cart by the force F is

W_F = Fcos \theta d

where

d = 22.0 m is the displacement of the cart

Substituting,

W_F=(44.0)(22.0)=+968 J

However, there is another force acting in the horizontal direction: the force of friction, acting in the direction opposite to the displacement. So, the work done by friction will be negative, and it is:

W_f=-F_f d =-(44.0)(22.0)=-968 J

This means that the total work done on the cart is:

W=W_F+W_f=+968+(-968)=0 J

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denpristay [2]

Answer:

1.33×10⁻¹⁰ N

Explanation:

F = GMm / r²

where G is the gravitational constant,

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The correct answer is:

Does the measurement include direction?

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A spring is attached to the ceiling and pulled 8 cm down from equilibrium and released. The amplitude decreases by 17% each seco
Vadim26 [7]

Answer:

D(t) = 8(0.83)^(t) cos 38πt

Explanation:

We are told that the spring oscillates 19 times each second.

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We are also told that it's pulled 8cm downwards and the amplitude decreases by 17% each second.

Thus;

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A = 8(0.83)^(t)

If we consider the function;

y = A cos (bx - c) + d

Now, 2π/b = period

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b = 38π

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Explanation:

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b. Step 2: Data m = <u>1</u><u>.</u><u>5</u><u> </u><u>kg</u>, v = <u>2</u><u>0</u><u> </u><u>m</u><u>/</u><u>s</u>

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2 years ago
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