Questions from College Physics

Q: A woman’s systolic blood pressure when resting is 160 mmHg. What

A woman’s systolic blood pressure when resting is 160 mmHg. What is this pressure in (a) Pa, (b) lb/in2, and (c) atm?

Q: (a) How much net work does this engine do per

(a) How much net work does this engine do per cycle? (b) Assuming that the efficiency of the engine is 0.444, what is the heat input into the gas per cycle? (c) How much heat is exhausted per cycle?...

Q: A reversible refrigerator has a coefficient of performance of 3.0

A reversible refrigerator has a coefficient of performance of 3.0. How much work must be done to freeze 1.0 kg of liquid water initially at 0°C?

Q: A sample in a centrifuge moves in a circle of radius 8

A sample in a centrifuge moves in a circle of radius 8.0 cm at a constant speed of 500 m/s. (a) How much time does it take for the velocity’s direction to change by 45° (1/8 of a revolution)? (b) Wh...

Q: (a) What is the maximum temperature of the gas?

(a) What is the maximum temperature of the gas? (b) What would be the efficiency of an ideal engine with reservoirs at the maximum and minimum temperatures of this engine? Compare this to the actual...

Q: The main energy expenditure involved in running is the work done by

The main energy expenditure involved in running is the work done by the muscles to accelerate the legs. When a foot strikes the ground, it is momentarily brought to rest while the remainder of the ani...

Q: (a) For a reversible engine, will you obtain a

(a) For a reversible engine, will you obtain a better efficiency by increasing the high-temperature reservoir by an amount ΔT or decreasing the low-temperature reservoir by the same amount ΔT? Explain...

Q: A charge of 63.0 nC is located at a distance

A charge of 63.0 nC is located at a distance of 3.40 cm from a charge of −47.0 nC. What are the x- and y-components of the electric field at a point P that is directly above the 63.0...

Q: An engine operates between temperatures of 650 K and 350 K at

An engine operates between temperatures of 650 K and 350 K at 65.0% of its maximum possible efficiency. (a) What is the efficiency of this engine? (b) If 6.3 × 103 J is exhausted to the low temperat...

Q: In a cathode ray tube, electrons initially at rest are accelerated

In a cathode ray tube, electrons initially at rest are accelerated by a uniform electric field of magnitude 4.0 × 105 N/C during the first 5.0 cm of the tube’s length; then they move at essentially co...