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.
d
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A sprinter moving at 10 m/s slows down at a rate of 1.4 m/s2. How fast is the runner moving after 4 seconds?
A. 5.8 m/s B. 15.6 m/s C. 0 m/s D. 4.4 m/s
A 10.0-kg picture is held in place by two wires, the first one hanging at 50.0° to the left of the vertical and the second one at 45.0° to the right of the vertical. What is the tension force that the first wire exerts on the picture?
A) 69.6 N B) 50.8 N C) 98.1 N D) 69.4 N E) 23.8 N
The most unreliable (variable) diagnostic property of minerals such as quartz is ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following best represents the energy transformations in a coal-fired electric power plant?
A) chemical ? thermal ? kinetic ? electromagnetic B) radiant ? kinetic ? electromagnetic ? thermal C) electromagnetic ? thermal ? kinetic D) gravitational ? kinetic ? electromagnetic E) chemical ? kinetic ? thermal ? electromagnetic