A 2-kg car moving towards the right at 4 m/s collides head on with an 8 kg car moving towards the left at 2 m/s, and they stick together. After the collision, the velocity of the combined bodies is
a. 0.
b. 0.8 m/s towards the right.
c. 0.8 m/s towards the left.
d. 2.4 m/s towards the right.
e. 2.4 m/s towards the left.
c
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The Roche limit is the point at which:
A) the mass of an object classifies it as a moon. B) a moon orbiting a planet experiences synchronous rotation. C) the external tidal forces on an object are strong enough to be felt by the object. D) the external tidal forces on an object become greater than the internal forces that hold it together. E) the internal forces that hold an object together weaken so that the object falls apart.
What color does the planet Mars appear to the naked eye in the sky?
A) yellow B) white C) blue D) red
We define the total mechanical energy of an object as
a. potential energy plus kinetic energy. b. inertial energy plus kinetic energy. c. gravitational energy plus potential energy. d. mental energy plus physical energy.
According to the sign conventions in the book, which objects have a negative focal length?
A. Nothing has a negative focal length B. Diverging lens and converging mirror C. Diverging lens and diverging mirror D. Converging lens and diverging mirror