Although perpetual motion is the natural order of things in the universe
A) it follows that machines can operate and do work by perpetual motion.
B) no perpetual-motion device that multiplies energy exists.
C) both of these are false statements
Answer: B
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In order, from top to bottom, in the activity series come Li, K, Ba, Na, Al, Zn, Sn, and Pb. Therefore,
a. tin is more active than lead. b. zinc is more active than aluminum. c. potassium is more active than lithium. d. sodium is more active than barium.
A car is going around a racetrack at constant speed. The curves around the track have different radii. In which turn is the magnitude of the car's acceleration the greatest?
a. It is the greatest in the turn with the greatest radius. b. It is the greatest in the turn with the smallest radius. c. The acceleration is zero everywhere because of the constant speed. d. More information is needed to determine the answer.
A 2 500-kg car is moving at 2.30 m/s. How fast must a 1.5-kg toy car be moving so that the two have the same kinetic energy?
a. 61.9 m/s b. 3.97 m/s c. 93.9 m/s d. 6 610 m/s
A sample of water has a mass of 10.0 grams. What is the number of molecules of water in the 10.0 gram sample (H = 1u, O = 16u)?
a. 
b. 
c. 
d. 
e. 