What is the Asteroid belt?
A. a line of craters on the Moon caused by an asteroidal impact about 50 million years ago
B. the place in the Solar System where most of the asteroids are found
C. a line of craters on Earth caused by an asteroidal impact about 50 million years ago
D. a term used to describe the impact of a very large asteroid with a planet
E. None of these choices is correct.
Answer: B
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Consider a point on a bicycle wheel as the wheel turns about a fixed axis, neither speeding up nor slowing down. Compare the linear and angular accelerations of the point
a. Both are zero. b. Only the angular acceleration is zero. c. Only the linear acceleration is zero. d. Neither is zero.
The free-body diagram below represents a 1500-kg car sitting on a 3000-kg bridge supported at its far ends. The car's position is three quarters of the length L from the left end of the bridge. Identify the one error in the torque equation below:
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What value of B should be used in a velocity selector to separate out 2.0-keV protons if E is fixed at 80 kV/m?
a. 0.18 T b. 0.11 T c. 0.15 T d. 0.13 T e. 0.23 T
Two pipe columns are required to have the same Euler buckling load Pcr. Column 1 has flexural rigidity EI and height L1; column 2 has flexural rigidity (4/3)EI and height L2. The ratio (L2/L1) at which both columns will buckle under the same load is approximately:
(A) 0.55
(B) 0.72
(C) 0.81
(D) 1.10