A 160 lb person has a mass of 160/32 = 5 slugs. A 160 lb person steps into an elevator and stands on a bathroom scale. Determine the scale reading for the given scenarios. After moving upwards at constant speed, the elevator is slowing down at 2 m/s2 as it is coming to rest
a. 150 lb c. 170 lb
b. 160 lb d. none of the above
A
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Thermodynamic Devices: If the efficiency of a reversible engine is 28%, what is its COP (performance coefficient) operated (a) as a refrigerator, and (b) as a heat pump?
Fill in the blank(s) with the appropriate word(s).
Free Fall: A ball is thrown straight up with a speed of 30 m/s, and air resistance is negligible.(a) How long does it take the ball to reach the maximum height?(b) What is the maximum height reached by the ball?(c) What is its speed after 4.2 s?
What will be an ideal response?
The gas motions within granules on the solar surface are
a. upward in the centers of some cells and downward in others; the gas cools as it passes between individual granules. b. actually motionless. The dark regions are absorption features from gases in the photosphere. c. upward in the bright cell centers and downward around the darker edges. d. downward in the bright cell centers and upward around the darker edges.
A 10-kg object is dropped from rest. After falling a distance of 50 m, it has a speed of 26 m/s. What is the change in mechanical energy caused by the dissipative (air) resistive force on the object during this descent?
a. -1.3 kJ b. -1.5 kJ c. -1.8 kJ d. -2.0 kJ e. -2.3 kJ