When a constant and sustained upward force acts on a rocket, its acceleration increases mainly because
A) gravity becomes weaker with increased distance.
B) the mass of the rocket decreases as fuel is burned.
C) No way, for acceleration would be constant.
Answer: B
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Coulomb's Law: Three equal charges +Q are at three of the corners of a square of side d. A fourth charge +Q of equal magnitude is at the center of the square as shown in the figure Which one of the arrows shown represents the net force acting on the charge at the center of the square?
A. A B. B C. C D. D
What fundamental fact underlies the operation of essentially all electric motors?
A) Iron is the only element that is magnetic. B) A current-carrying conductor placed perpendicular to a magnetic field will experience a force. C) Opposite electric charges attract and like charges repel. D) A magnetic North pole carries a positive electric charge, and a magnetic South pole carries a negative electric charge. E) Alternating current and direct current are both capable of doing work.
Someone on the far side of the Moon would observe Earth rise once every
a. 24 hours. b. 24 hours and 50 minutes. c. 29.5 Earth days. d. None of these, the observer would never see Earth rise.
Can you think of any refinements to the model for PCM thermal storage as shown schematically in Figure 10-27?
What will be an ideal response?