Why is the nightside of Mercury so much colder (relatively speaking) than the dayside?
A. Mercury's slow rotation gives the nightside plenty of time to release its heat.
B. Mercury's magnetic field acts like a blanket on the planet's dayside.
C. Mercury's small size lets it cool quickly.
D. Mercury is in synchronous rotation, so the far side of Mercury never sees the Sun.
Answer: A
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A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular velocity of 25 radians per seconds, then the tangential velocity of a point on the circumference is
A. 1.0 m/s. B. 1.5 m/s. C. 2.0 m/s. D. 2.5 m/s. E. 3.0 m/s.
If the voltage at a point in space is zero, then the electric field must be
A) negative. B) zero. C) uniform. D) positive. E) impossible to determine based on the information given.
A constant force is applied to a body that is already moving. The force is directed at an angle of 60 degrees to the direction of the body's velocity. What is most likely to happen is that
A. the body will stop moving. B. the body will move in the direction of the force. C. the body's velocity will increase in magnitude but not change direction. D. the body will gradually change direction more and more toward that of the force while speeding up. E. the body will first stop moving and then move in the direction of the force.
A boat moves through the water in a river at a speed of 8 m/s relative to the water. The boat makes a trip downstream and then makes a return trip upstream to the original starting place. Which trip takes longer?
a. the downstream trip b. the upstream trip c. Both trips take the same amount of time. d. The answer cannot be figured without knowing the speed of the river flow.