A fire fighting vehicle of mass 12,000 kg is at rest but free to roll with no resistance. If you push it forward with a force of 500 N, the momentum at the end of 10 s of pushing will be
A. 5000 kg m/s.
B. zero.
C. 20,000 kg N/s.
D. 0.416 m/s.
Answer: A
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Two ways in which the starting conditions in a protogalactic cloud might cause it to become an elliptical (rather than spiral) galaxy are if the cloud begins with either
A) relatively little angular momentum or relatively high density. B) relatively high angular momentum or relatively low density. C) relatively high mass and a relatively low abundance of heavy elements. D) relatively low mass and a relatively high abundance of heavy elements.
A car travels along the perimeter of a vertical circle (radius = 0.25 km) at a constant speed of 30 m/s. What is the magnitude of the resultant force on the 60-kg driver of the car at the lowest point on this circular path?
a. 0.37 kN b. 0.80 kN c. 0.22 kN d. 0.59 kN e. 0.45 kN
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Velocity Addition: A spaceship, traveling at 0.560c towards a stationary space platform, launches a secondary towards the station with a speed of 0.100c relative to the spaceship. What is the speed of the secondary rocket relative to the space platform?
A. 0.460c B. 0.575c C. 0.600c D. 0.625c E. 0.660c