A block is launched up an inclined plane. After going up the plane, it slides back down to its starting position. The coefficient of friction between the block and the plane is 0.3 . The time for the trip up the plane:
a. is the same as the time for the trip down.
b. is more than the time for the trip down.
c. is less than the time for the trip down.
d. cannot be found compared without knowing the angle of inclination.
C
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The following images show Earth and the four jovian planets of our solar system. Rank these planets from left to right based on their mass, from lowest to highest. (Not to scale.)
How is the presence of space debris accounted for by solar system models?
a. Space debris is left over material from the early solar system that never formed into a planet. b. Space debris was formed by the collision of objects after the planets formed. c. Space debris is material that existed in our region of space before the Sun formed. d. Space debris is left over material from the early solar system that never formed into a planet and was formed by the collision of objects after the planets formed. e. All of the other choices are correct.
An airplane travels 80 m/s as it makes a horizontal circular turn which has a 0.80-km radius. What is the magnitude of the resultant force on the 75-kg pilot of this airplane?
a. 0.69 kN b. 0.63 kN c. 0.66 kN d. 0.60 kN e. 0.57 kN
A 10 kg solid cylinder (I = 1/2 
with a radius of 30.0 cm is rotating about a vertical axis through its center. If the angular momentum is increasing at the rate of 25.0 kg 
then what is the angular acceleration?
A. 75.3 
B. 65.9
C. 55.6
D. 40.5
E. 35.2