Starting from rest, a 2-kg body acquires a speed of 8 m/s in 2 seconds. The net force acting on the body is
a. 2 N.
b. 4 N.
c. 8 N.
d. 16 N.
e. 6 N.
c
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Suppose you are inside a smooth-flying [no bumps] jet plane moving at constant speed in a straight line across the Atlantic Ocean. Can you detect this motion [i.e
, can you tell that you are moving] without directly or indirectly making use of anything outside of your own reference frame? If so, how could you detect this; and if not, why not? A) Yes. For example, if you dropped a coin you would find that it lands to the rear of the drop point. B) Yes. For example, if you dropped a coin you would find that it lands to the front of the drop point. C) No, because of the principle of relativity. D) No, because of the principle of the constancy of lightspeed. E) No, because jet planes move far too slowly for such an effect to actually be observed.
Why is the southern hemisphere of Mars believed to be older than the northern?
A) The southern hemisphere is darker much like the lunar mare. B) The southern hemisphere is more heavily cratered. C) The northern hemisphere is higher, due to the Tharsis Bulge. D) The northern hemisphere leans more away from the Sun in winter. E) The south polar cap is much thicker than the north one.
If you run a complete loop around an outdoor track of length 400 m in 100 s, find your
(a) average velocity and (b) average speed. What will be an ideal response?
No magnetic force acts on a current carrying wire when it
A) carries a very small current. B) is perpendicular to the magnetic field. C) either or both of these D) none of the above