Using Newton's first law, describe the motion of a body is moving in the absence of any net external force
What will be an ideal response?
in a straight line at constant speed forever
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A spacecraft (mass = m1) orbits a planet (mass = m2) in a circular orbit (radius = r). What is the minimum energy required to send this spacecraft to a distant point in space where the gravitational force on the spacecraft by the planet is negligible?
a. Gm1m2/(4r) b. Gm1m2/R c. Gm1m2/(2R) d. Gm1m2/(3R) e. 2Gm1m2/(5R)
A 70-kg swimmer dives horizontally off a 500-kg raft. The diver's speed immediately after leaving the raft is 6.0 m/s. A micro-sensor system attached to the edge of the raft measures the time interval during which the diver applies an impulse to the raft just prior to leaving the raft surface. If the time interval is read as 0.25 s, what is the magnitude of the average horizontal force by diver
on the raft? a. 110 N b. 420 N c. 2 000 N d. 1 700 N e. 24 N
An automobile travels due north with a speed of 68 km/h and an acceleration of 1.5 m/s2 . All forces considered, the unbalanced force acting on the auto is
a. zero. b. southward. c. northward. d. downward. e. upward.
The trade wind belts are regions of generally
A) little rainfall. B) heavy rainfall. C) low temperatures. D) westerly winds.