When an automobile moves with constant velocity the power developed is used to overcome the frictional forces exerted by the air and the road. If the power developed in an engine is 50.0 hp, what total frictional force acts on the car at 55 mph (24.6 m/s)? One horsepower equals 746 W
1 520 N
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What is the total energy of an electron moving with a speed of 0.950c? (c = 3.0 × 108 m/s, mel = 9.11 × 10-31 kg)
A) 2.6 × 10-13 J B) 8.2 × 10-14 J C) 1.1 × 10-13 J D) 1.2 × 10-14 J
Negative work can be done
a. by friction on the tires while a car is accelerating without skidding. b. by a spring at the bottom of an elevator shaft when it stops a falling elevator. c. by a hand catching a ball. d. by all of the above. e. only by (b) and (c) above.
A 35-mm single lens reflex (SLR) digital camera is using a lens of focal length 35.0 mm to photograph a person who is 1.80 m tall and located 3.60 m from the lens
(a) How far is the CCD sensor from the lens when the person is in focus? (b) How tall is the person's image on the CCD sensor?
As a rock sinks deeper and deeper into water of constant density, what happens to the buoyant force exerted on it by water on it if it started above the surface of the water?
A) The buoyant force keeps increasing steadily. B) The buoyant force remains constant. C) The buoyant force first increases and then remains constant. D) The buoyant force steadily decreases.