Which statement about the Moon's orbit is true?
A. The Moon is in synchronous rotation as it orbits Earth.
B. The Moon's orbit is aligned with Earth's orbit.
C. The Moon is in a geosynchronous orbit around Earth.
D. The Moon rotates in the opposite direction than it orbits Earth.
Answer: A
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A sharp knife can more easily cut objects than can a dull knife because
A. sharp knives have edges that can fit between the molecules of the object. B. a greater force can be applied with a sharp knife. C. dull knives cannot apply large forces. D. a greater pressure can be applied with a sharp knife.
A billiard ball is moving in the x direction at 30.0 cm/s and strikes another billiard ball moving in the y direction at 40.0 cm/s. As a result of the collision, the second ball moves at 50.0 cm/s, and the first ball stops. In what final direction does the second ball move?
a. in the x direction b. at an angle of 45.0o ccw from the x direction c. at an angle of 53.1o ccw from the x direction d. Such a collision cannot happen.
A race car goes around a curve at 50 m/s. The radius of the curve is 400 m. What is the car's acceleration?
A student uses a thermometer calibrated in Kelvin units. A temperature change of 20 K is equivalent to a change of how many degrees on the Celsius scale? ________.
Fill in the blank(s) with the appropriate word(s).