PHYV101: Physics 1A for Engineers (2025)

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A rock attached to a string swings in a vertical circle. Which free body diagram could correctly describe the force(s) on the rock when it is at the lowest point?

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In the figure shown, the coefficient of kinetic friction between the block and the incline is 0.29. What is the magnitude of the acceleration of the suspended block as it falls? Disregard any pulley mass or friction in the pulley.

5.4 m/s²

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5.2 m/s²

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4.9 m/s²

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5.6 m/s²

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7.9 m/s²

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Exhibit 5-2

A 4.00 kg block is suspended from the roof of an elevator. A 2.00 kg block is suspended from the 4.00 kg block. The tensions in strings 1 and 2 are labeled  T

₁ and T₂

Use this exhibit to answer the following question(s).

Refer to Exhibit 5-2. When the elevator accelerates downwards with an acceleration of 2.20 m/s², the magnitudes of T₁ and T₂ are

30.4 N; 15.2 N.

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39.2 N; 19.6 N.

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45.6 N; 15.2 N.

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48.0 N; 24.0 N.

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72.0 N; 24.0 N.

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The coefficient of kinetic friction between the surface and the larger block is 0.25, and the coefficient of kinetic friction between the surface and the smaller block is 0.40. If F = 22N and M = 1.0 kg in the figure, what is the magnitude of the acceleration of either block?

1.8 m/s²

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2.6 m/s²

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1.4 m/s²

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2.2 m/s²

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3.7 m/s²

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If F = 5.0 N, what is the magnitude of the force exerted by block 2 on block 1?

17 N

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19 N

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21 N

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23 N

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5.0 N

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A 1.5-kg object has a velocity of 5 m/s at t = 0. It is accelerated at a constant rate for five seconds after which it has a velocity of (6+ 12) m/s. What is the magnitude of the resultant force acting on the object during this time interval?

3.8 N

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3.2 N

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2.8 N

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4.3 N

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4.6 N

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