The water behind Grand Coulee Dam is 1200 m wide and 160 m deep. Find the hydrostatic force on the back of the dam. (Hint: the total force = average pressure × area)
a. 5.2 × 10^9 N
c. 13.2 × 10^10 N
b. 8.8 × 10^10 N
d. 15.1 × 10^10 N
D
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If a spherical convex mirror has a radius of curvature R, the magnitude of its focal length is
A) R/2. B) R/4. C) R. D) 2R. E) 4R.
Why does a golf ball hit on the Moon travel farther than one hit on Earth? (Neglect air resistance and bad golfers.)
A. The Moon is physically smaller than Earth, so the golf ball only looks like it travels farther. B. The mass of the ball is lower on the Moon, so it is accelerated more easily there. C. The surface gravity is lower on the Moon, so the golf club can be accelerated more easily there. D. The surface gravity is lower on the Moon, so the acceleration of gravity is lower.
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Answer the following statement true (T) or false (F)
If the stars at the turnoff point of a cluster have a mass of 3 M?, what is the age of the cluster?
a. 3.0 x 1010 years b. 3.3 x 109 years c. 6.4 x 108 years d. 1.6 x 1011 years e. The age of a star cluster can not be determined from the mass of stars at the turnoff point.