Kinetic Energy: A 1000-kg car is moving at 15 km/h. If a 2000-kg truck has 23 times the kinetic energy of the car, how fast is the truck moving?
A. 51 km/h
B. 72 km/h
C. 61 km/h
D. 41 km/h
Answer: A
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a. 2,100 b. 46 c. 4,300,000 d. 230 e. 684
The focal lengths of the objective and the eyepiece in a microscope are 0.290 cm and 2.50 cm, respectively
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A 0.40-kg particle moves under the influence of a single conservative force. At point A where the particle has a speed of 10 m/s, the potential energy associated with the conservative force is +40 J. As the particle moves from A to B, the force does +25 J of work on the particle. What is the value of the potential energy at point B?
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Which formula is dimensionally consistent with an expression yielding a value for velocity? (a is acceleration, x is distance, and t is time)
a. v/t2 b. vx2 c. v2/t d. at