A wooden block contains some nails so that its density is exactly equal to that of water. If it is placed in a tank of water and released from rest when it is completely submerged, it will
A) rise to the surface.
B) sink to the bottom.
C) remain where it is released.
C
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A 2000 kg car is traveling at 20.0 m/s and then puts on the brakes and comes to a complete stop. The heat generated at the brakes due to stopping heats up the brakes. The mass of the brake system is 20.0 kg and it has a specific heat of 0.200 kcal/kg 
What is the increase in the temperature of the brakes?
A. 75.3
B. 53.1
C. 23.9
D. 18.9
E. 12.4
In the context of this chapter, what is an orphan planet?
A) a planet-size object that does not orbit a star B) a planet orbiting a star that is not a member of a galaxy C) a planet that has microbial life but no larger organisms D) a planet with no moons, such as Mercury or Venus
A ball is dropped from somewhere above a window that is 2.00 m in height. As it falls, it is visible to a person looking through the window for 200 ms as it passes by the 2.00 m height of the window
From what height above the top of the window was the ball dropped? A) 8.32 m B) 1.87 m C) 4.15 m D) 4.76 m E) 6.78 m
What is happening at the anodic region?
Rust has a tendency to form when iron in contact with water reacts according to the following reaction: 4 Fe + 3 O2 ? 2 Fe2O3 A) Iron is being oxidized. B) Oxygen is being oxidized. C) Oxygen is being reduced. D) Iron is being reduced. E) none of the above