When a solid is changed to a liquid, the solid
A) releases energy.
B) absorbs energy.
C) both of these
D) neither of these
Answer: B
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Evolutionary hypotheses suggest that planets form by natural and gradual processes
a. True b. False Indicate whether the statement is true or false
Slanting Surfaces With Friction: The figure shows a block of mass m resting on a 20° slope. The block has coefficients of friction ?s = 0.64 and ?k = 0.54 with the surface of the slope. It is connected using a very light string over an ideal pulley to a hanging block of mass 2.0 kg. The string above the slope pulls parallel to the surface. What is the minimum mass m so the system will remain at rest when it is released from rest?
A. 2.1 kg B. 3.3 kg C. 1.3 kg D. 3.6 kg
Multiple-Object Accelerating Systems: In the figure, block A has a mass of 3.00 kg. It rests on a smooth horizontal table and is connected by a very light horizontal string over an ideal pulley to block B, which has a mass of 2.00 kg. When block B is gently released from rest, how long does it take block B to travel 80.0 cm?
A. 0.404 s B. 0.494 s C. 0.639 s D. 0.785 s E. 0.935 s
Describe the impact the discovery of extrasolar planets h as had on the question of life on other worlds
What will be an ideal response?