You walk 55 m to the north, then turn 60° to your right and walk another 45 m. How far are you from where you originally started?
A) 87 m
B) 50 m
C) 94 m
D) 46 m
A
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A 2,000 kg car traveling at 30.0 mi/h skids to a stop in 60.0 meters. The force of friction during the skid is (1.0 mi/h = 0.447 m/s)
A. 4,500 N. B. 4,200 N. C. 3,750 N. D. 3,000 N. E. 2,400 N.
Three identical bar magnets, each 2 cm long, are placed in a straight line on a frictionless surface with their ends equally spaced with 2 cm between ends. They are constrained so they cannot rotate, but they can slide along the straight line. The left magnet has its north pole nearest the north pole of the middle magnet, and the right magnet has its south pole toward the middle magnet’s south pole. Once they are in place and released from rest, which of the following best describes the motion of the magnets?
a. The end magnets will move away from the center magnet.
b. The magnets will not move since they are equally spaced.
c. The magnets will snap together.
d. None of the above would happen.
An iron-80 atom %
A warm dust cloud in which stars are forming would be best observed with a(n) ________ telescope.
A. gamma-ray B. infrared C. optical (visible light) D. radio