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3 years ago

12

A wrench is accidentally dropped at the top of an elevator shaft in a tall building. (a) How many meters does the wrench fall in

1.5s

1 answer:

RUDIKE [14]3 years ago

6 0

Answer:

11.25m

Explanation:

$s = ut + \frac{1}{2} a {t}^{2} \\ = 0 \times 1.5 + \frac{1}{2} \times 10 \times {1.5}^{2} \\ = 5 \times 2.25 \\ = 11.25$

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8. You push downward on a box with a force of 750 N. The box is on a flat horizontal surface for which the coefficient of static

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Answer:

The mass of the heaviest box you will be able to move with this applied force = 61.4 kg

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From the diagram attached, the forces acting on the box include the weight of the box, applied force on the box, normal reaction of the surface on the box and the Frictional force in the opposite direction to the applied force.

For the box to be able to move, the applied force must have a horizontal component that at least matches the Frictional force between the box and the surface. This is the force balance in the horizontal direction.

Resolving the applied force into horizontal and vertical components,

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Doing a force balance in the vertical axis,

N = (mg + 316.96)

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The correct answer is
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