The reason that you would use a ramp to carry a weight to the top of a platform, rather than lifting it up a ladder, is because the
a. force exerted would be less
b. work done would be less
c. power expended would be less
d. gain in potential energy would be more
a
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Thermodynamic Devices: A heat pump with a performance coefficient (COP) of 4.9 absorbs heat from the atmosphere at a rate of 29 kW. At what rate is work being done to run this heat pump?
A. 6 kW B. 142 kW C. 113 kW D. 35 kW
A rock dropped from a 5-m height accelerates at 10 m/s2 and strikes the ground 1 s later. If the rock is dropped from a height of 2.5 m, its acceleration of fall is
A) half. B) the same. C) twice. D) four times as much.
How many joules of energy are used by a 1.0-hp motor that runs for 1.0 hour? (1 hp = 746 W)
A) 3.6 kJ B) 2.7 MJ C) 45 kJ D) 4.8 J
Sound of frequency 600 Hz is emitted by a point source. The sound can travel along two different paths to reach an observer
What is the minimum non-zero path length difference that results in constructive interference? Assume the speed of sound in air is 340 m/s. A) 28.3 cm B) 1.13 m C) 1.76 m D) 88.2 cm E) 56.7 cm