A mass of 100kg attached to a massless rope is causing a pulley with disk radius

Question

A mass of 100kg attached to a massless rope is causing a pulley with
disk radius of 40cm to accelerate. The mass accelerates downward
with 8.6m/s2. What is the mass of the disk (? = 48 Nm) ?

1. 100 kg
2. 70 kg
3. 28 kg
4. 12 kg

A balloon of volume 0.5m3 filled with air is pulled under
water subjected to a pressure change of 105N/m2
(~10 meters) What is the final volume of that balloon?

1. 0.35 m3
2. 0.45 m3
3. 0.15 m3
4. 0.01 m3

A garden hose w/ inner diameter 2 cm, carries water at 2.0 m/s. To
spray your friend, you place your thumb over the nozzle giving an
effective opening diameter of 0.5 cm. What is the speed of the
water exiting the hose?

1. 25 m/s
2. 2 m/s
3. 32 m/s
4. 8 m/

Explanation / Answer

3

4

1

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