A rock held above the ground has potential energy. As the rock falls, this potential energy is converted to kinetic energy. Finally, the rock hits the ground and stays there. What has happened to the energy?
A) It is transformed back into gravitational potential energy.
B) The energy goes into the ground, and as a result, the orbit of the Earth about the Sun is slightly changed.
C) The energy goes to producing sound and to heating the ground, rock, and surrounding air.
D) The rock keeps the energy inside it in the form of mass-energy.
C
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Water flows through a pipe. The diameter of the pipe at point B is larger than at point A. Where is the water pressure greatest?
A) at point A B) at point B C) It is the same at both A and B.
A converging lens with the same curvature on both sides and focal length 25. cm is to be made from crown glass (n = 1.52). What radius of curvature is required for each face?
What will be an ideal response?
Science, art, and religion normally need not contradict one another because
A) all three involve different domains. B) choosing the right one means no need to heed the other two. C) choosing religion and art means no need to heed science. D) choosing science means no need to heed religion and art.
A thin ribbon of a silver alloy 2.00-cm wide and 0.015 0-mm thick carries a current of 6.98 A perpendicular to a magnetic field. The Hall voltage is found to be 1.24 × 10^?4 V when the magnetic field is 2.50 T. Calculate n, the number of charge carriers per cubic meter