An asteroid, of mass
kg is observed to have an escape speed equal to a typical person’s speed attained by jumping off, 3.0m/s. What is its radius?
A. 6.3 km
B. 2.1 km
C. 1.0 km
D. 0.5 km
B. 2.1 km
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Dimensional Analysis: Newton's second law, F = ma, relates force F, mass m, and acceleration a. Use this equation to deduce the SI units of force.
A. kg ? m/s B. s2 / (kg ? m) C. m/s2 D. kg ? m/s2 E. m2/s2
A 20.0 cm wrench is used to generate a torque at a bolt. A force of 50 N is applied perpendicularly at the end of the wrench. The torque generated at the bolt is
A. 8.0 N•m. B. 10 N•m. C. 14 N•m. D. 22 N•m. E. 37 N•m.
The planet with a hexagonally shaped storm at its pole is
a. Jupiter. b. Neptune. c. Uranus. d. Saturn. e. Mars.
You are standing in a moving bus, facing forward, and you suddenly move forward as the bus comes to an immediate stop. What force caused you to move forward?
A) force of gravity B) normal force due to your contact with the floor of the bus C) force due to static friction between you and the floor of the bus D) force due to kinetic friction between you and the floor of the bus E) no forces were responsible for your fall.