An object starts from rest and undergoes uniform acceleration. During the first second it travels 5.0 m. How far will it travel during the third second?
A) 25 m B) 15 m C) 5.0 m D) 45 m
A
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A sled weighs 100 N. It is held in place on a frictionless 30° slope by a rope attached to a stake at the top; the rope is parallel to the slope. What is the normal force acting on the sled?
a. 94 N c. 50 N b. 87 N d. 34 N
If three vectors add to zero, they must all have equal magnitudes
A) True B) False
A quarterback takes the ball from the line of scrimmage, runs backward for 12 yards, then sideways parallel to the line of scrimmage for 18 yards. He then throws a 47-yard forward pass straight downfield perpendicular to the line of scrimmage. The receiver is tackled immediately. How far is the football displaced from its original position?
a. 39 yards b. 47 yards c. 31 yards d. 62 yards e. 66 yards
What causes the change of the constellations with the seasons?
A. the cycle of lunar phases B. This is merely an illusion caused as the length of the day changes. C. It is caused as the constellations move amongst themselves. D. It is caused by Earth's motion around the Sun.