Velocity: When is the average velocity of an object equal to the instantaneous velocity?
A. only when the velocity is increasing at a constant rate
B. only when the velocity is decreasing at a constant rate
C. when the velocity is constant
D. always
E. never
Answer: C
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At the yield stress in a metal,
(a) Dislocation motion starts. (b) The plastic strain is equal to 0.002. (c) Plastic strain begins. (d) The specimen starts to neck.
Which of the following statements is true:
A. If the electric potential is zero at a point, then the electric field is zero at that point also. B. If the electric field is zero throughout a region of space, then the electric potential is necessarily also zero there C. If the electric field is zero at a point, then the electric potential is zero at that point also. D. If the electric potential is zero throughout a region of space, then the electric field is necessarily also zero there E. The electric field is large where the potential is large, and vice versa.
Where did the cosmic microwave background (CMB) come from?
a. photons emitted from the first stars b. photons released from hydrogen in our galaxy c. light scattered by dust in our Solar System d. photons released when electrons and nuclei combined for the first time
The most detailed look we've had of an asteroid comes from:
A) spacecraft sent to an asteroid. B) ground based optical images. C) Earth orbital X-ray images. D) ground based radar images. E) high-altitude UV spectroscopy.