Its more difficult to start moving a heavy carton from rest than it is to keep pushing it with constant velocity, because
A) The normal force is greater when the carton is at rest.
B) ?s < ?k.
C) Initially, the normal force is not perpendicular to the applied force.
D) ?k < ?s.
E) ?s = ?k.
D
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Einstein's theory of relativity tells us that travelers who make a high-speed trip to a distant star and back will ________
A) never be able to make the trip within their lifetimes B) age less than people who stay behind on Earth C) age more than people who stay behind on Earth D) have more fun than people who stay behind on Earth
As entropy in a system increases, energy within the system
A) becomes more ordered. B) becomes less ordered. C) reaches equilibrium. D) moves toward destruction.
Explain why the spring and neap tides occur periodically
What will be an ideal response?
Several charges in the neighborhood of point P produce an electric potential of 6.0 kV (relative to zero at infinity) and an electric field of 36 N/C at point P. Determine the work required of an external agent to move a 3.0-?C charge along the x axis from infinity to point P without any net change in the kinetic energy of the particle
a. 21 mJ b. 18 mJ c. 24 mJ d. 27 mJ e. 12 mJ