Bumpers on cars are not of much use in a collision. To see why, calculate the average force a bumper would have to exert if it brought a 1200-kg car
(a so-called compact model) to a rest in 15 cm when the car had an initial speed of 2.0 m/s (about 4.5 mph). (Bumpers are built with springs that compress to provide a stopping force without, hopefully, denting the metal.)
A) 1.8 × 104 N
B) 1.6 × 104 N
C) 5.4 × 104 N
D) 6.5 × 105 N
E) 3.2 × 104 N
B
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An refrigerator keeps food in the freezer portion at 
and dumps excess heat into the kitchen, whose temperature is 
If the refrigerator has half the coefficient of performance of an ideal reversible refrigerator, and if its motor can supply 250W of power, what is the rate of heat flow into the kitchen?
A. 950W B. 910W C. 625W D. 150W
Every second at Niagara Falls, some 5000 m3 of water falls a distance of 50 m. What is the increase in entropy per second due to the falling water? (Assume a 20°C environment)
A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up and down motion. A heavy truck hits a small car. At any given time during the impact,
a. the force the truck exerts on the car is larger than the force the car exerts on the truck b. the force the truck exerts on the car is smaller than the force the car exerts on the truck c. the force the truck exerts on the car is equal to the force the car exerts on the truck d. the only force present is the force of the truck on the car