Estimation: Estimate how many pennies would you have to stack to reach from the floor to an average 8-ft ceiling.
A. 2 × 103
B. 2 × 102
C. 2 × 104
D. 2 × 105
E. 2 × 106
Answer: A
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If three primary colors of light shine on a white wall and produce a white spot, the primaries must be
A) additive. B) subtractive. C) multiplicative. D) divisive.
What is the escape speed from a planet of mass m and radius r if m = 3.2 × 1023 kg and r = 2.4 × 106 m?
A. 5.5 km/s B. 4.2 km/s C. 5.2 km/s D. 4.8 km/s E. 3.7 km/s
The Milky Way is moving further away from most other galaxies in the universe
Indicate whether the statement is true or false
Car A rear ends Car B, which has twice the mass of A, on an icy road at a speed low enough so that the collision is essentially elastic. Car B is stopped at a light when it is struck. Car A has mass m and speed v before the collision. After the collision
a. each car has half the momentum. b. car A stops and car B has momentum mv. c. car A stops and car B has momentum 2mv. d. the momentum of car B is four times as great in magnitude as that of car A. e. each car has half of the kinetic energy.