As a supersonic aircraft increases in speed, the angle of its V-shaped shock wave becomes
A) wider.
B) narrower.
C) both of these
D) neither of these
Answer: B
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Energy Conservation With Conservative Forces: A heavy stone and a light stone are released from rest in such away that they both have the same amount of gravitational potential energy just as they are released. Air resistance is negligibly small. Which of the following statements about these stones are correct? (There could be more than one correct choice.)
A. The initial height of the light stone is greater than the initial height of the heavy stone. B. The stones must have been released from the same height. C. The stones both have the same speed just as they reach the ground. D. Just as it reaches the ground, the light stone is traveling faster than the heavy stone. E. The stones both have the same kinetic energy just as they reach the ground.
What happens to a sample of water when it is heated between 0°C and 4°C?
a. Its volume increases. b. Its volume is reduced. c. It vaporizes. d. Nothing changes except its temperature.
Coal power plants release particulates as well as other materials
What will be an ideal response?
In planetology, the heat of formation is:
A) the energy released by infalling matter. B) the heat released because of differentiation. C) the energy released from basin formation. D) the heat released from condensation.