A force of 715 n is applied to a roller-coaster car to push, Ask an Expert

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Q1. A rectangular container measuring 25 × 39 × 63 is filled with water. What is the mass of this volume of water?
An iron cube floats in a bowl of liquid mercury at 0 C.

a) if the temperature is raised to 28 C; will cube float higher or lower in the mercury?

b) By what percent would the fraction of volume submerged change?

Q2. Solve problems correctly.

1. If 2.13 X 10^6 of work must be completed on a roller-coaster car to move it 3.00 X 10^2 m, how large is the net force acting on car?

2. A force of 715 N is applied to a roller-coaster car to push it horizontally. If 2.72 X 10^4 J of work is done on car, how far has it been pushed?

3. In 0.181s, during a distance of 8.05m, a test pilot's speed decreases from 88.9m/s to 0 m/s. If the pilot's mass is 70kg, how much work is done against his body?

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