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nlexa [21]
3 years ago
9

As a marble rolls across the floor, it gradually slows to a stop due to friction. Which statement best describes the change in m

echanical energy of this system?
a.) Mechanical energy was transferred from the floor to the marble.

b.) Mechanical energy was transferred from the marble to the floor.

c.) The total energy of the marble and floor, including the mechanical energy, was reduced to zero.

d.) The mechanical energy of the marble was transformed into nonmechanical energy.
Physics
1 answer:
Olegator [25]3 years ago
3 0

Answer:

I belive it would be "C"

Explanation:

If it was any of the other answers "B" it would instantly stop. "A" it would roll forever.

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N 4. Which of the following can cause a short circuit?
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Answer:

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Explanation:

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A 1 kg flashlight is dropped from rest and falls to the floor without air resistance . At the point during its fall, when it is
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Answer:

The speed of the flashlight at that point is 3.7 m/s

Explanation:

When an object of mass M is at a height H above the ground, the potential energy of the object is:

U = M*H*g

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And for an object with velocity v, the kinetic energy is:

K = (M/2)*v^2

We know that when the flashlight of mass  1kg is 0.7 meters above the ground, the potential energy is equal to the kinetic energy, then:

M = 1kg

H = 0.7m

g = 9.8 m/s^2

Replacing these in the equations, we get:

U = K

(1kg)*(0.7m)*(9.8 m/s^2) = ((1kg)/2)*v^2

As the mass factor appears in both sides, we can remove it:

(0.7 m)*(9.8 m/s^2) = (v^2)/2

Now we can multiply both sides by 2:

2*(0.7 m)*(9.8 m/s^2) = v^2

Now let's apply the square root to both sides:

√(2*(0.7 m)*(9.8 m/s^2)) = v = 3.7 m/s

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Answer:

4200 Joules

Explanation:

Work done =force x distance

From the question , we’re given f =350N ,

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Using the above formula, we have

Workdone = 350 x 12

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