A stone is lifted and released so that it falls to the ground. According to Galileo, it fell because
A) of its inertia.
B) of electrical attraction.
C) its natural motion is to fall.
D) of friction.
E) of gravity.
E
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A steel bracket ABC (EI 5 4.2 3 106 N # m2) with span length L 5 4.5 m and height H 5 2 m is subjected to load P 5 15 kN at C. The maximum rotation of joint B is approximately:
(A) 0.18
(B) 0.38
(C) 0.68
(D) 0.98
A motorcycle daredevil wants to ride up a 50.0 m ramp set at a 30.0° incline to the ground. It will launch him in the air and he wants to come down so he just misses the last of a number of 1.00 m diameter barrels. If the speed at the instant when he leaves the ramp is 60.0 m/s, how many barrels can be used?
A. 79 B. 318 C. 332 D. 355 E. 402
Centripetal means
a. center seeking b. pulls outward c. constant d. fast e. none of these
Where is the center of mass of the Earth-Moon system?
a. Near the Moon. b. In Australia. c. Not very far above the surface of the Earth. d. Halfway between the Earth and the Moon. e. Under the surface of the Earth.