Which star has the largest proper motion? Why?
What will be an ideal response?
Barnard's Star lies only about 6 light-years away, and the direction of its motion has a large component perpendicular to our line of sight.
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Why does the Milky Way appear as a band of light in the sky?
What will be an ideal response?
Jake pulls on a 25-kg cart with a constant force of 50 N. What is the wagon's acceleration?
A) 0.2 m/s2 B) 2.0 m/s2 C) 5 m/s2 D) 20 m/s2 E) 200 m/s2
During a hockey game, a puck is given an initial speed of 10 m/s. It slides 50 m on the horizontal ice before it stops due to friction. What is the coefficient of kinetic friction between the puck and the ice?
A) 0.090 B) 0.10 C) 0.11 D) 0.12
A 5.0-m long, 12-kg, ladder rests against a smooth vertical wall with the bottom of the ladder 3.0 m from the wall. The coefficient of static friction between the floor and the ladder is 0.28
What distance, measured along the ladder from the bottom, can a 60-kg person climb before the ladder starts to slip? A) 4.0 m B) 3.7 m C) 1.7 m D) 1.3 m E) 3.3 m