When a ball rises vertically to a height h and returns to its original point of projection, the work done by the gravitational force is
a. 0.
b. -mgh.
c. +mgh.
d. -2mgh.
e. +2mgh.
A
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A. 0.0030 J B. 0.30 J C. 60 J D. 600 J
For a first-quarter Moon, approximately what is the angle eastward from the Sun to the Moon?
a. 30° b. 90° c. 180° d. 360° e. 0°
The spherical distribution of the globular clusters in the Halo reminds us of the similar distribution of cometary nuclei in the ________ cloud
A) Hubble B) Kepler C) Kuiper D) Oort E) Shapley
Propped cantilever beam AB has moment M1 applied at joint B. Framework ABC has moment M2 applied at C. Both structures have constant flexural rigidity EI. If the ratio of the applied moments M1/M2 5 3/2, the ratio of the reactive moments MA1/MA2 at clamped support A is approximately:
(A) 1
(B) 3/2
(C) 2
(D) 5/2
