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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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 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
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
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