Two guitar strings are under the same tension and have the same length. If their fundamental frequencies are in a ratio of 3:2, what is the ratio of their masses?
A. 3/2
B. 2/3
C. 9/4
D. 4/9
D. 4/9
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For an isotope with a half-life of one day, at the end of three days the amount that remains is
A) none. B) one-half. C) one-quarter. D) one-eighth. E) none of the above
A 2.0-kg block slides down a fixed, rough curved track. The block has a speed of 5.0 m/s after its height above a horizontal surface has decreased by 1.8 m. Assume the block starts from rest. What is the change in mechanical energy of the block caused by the force of friction during this descent?
a. ?14 J b. ?12 J c. ?10 J d. ?16 J e. ?25 J
Which of the following best describes what would happen if a 1.5 solar mass neutron star, with a diameter of a few kilometers, were suddenly to appear in your hometown?
A) It would rapidly sink to the center of the Earth. B) It would crash into the Earth, throwing vast amounts of dust into the atmosphere which in turn would cool the Earth. Such a scenario is probably what caused the extinction of the dinosaurs. C) The combined mass of the Earth and the neutron star would cause the neutron star to collapse into a black hole. D) The entire mass of the Earth would end up as a thin layer, about 1 cm thick, over the surface of the neutron star. E) It would crash through the Earth, creating a large crater, and exit the Earth on the other side.
A circular hole is drilled into an aluminum sheet. When the sheet is heated, the diameter of the hole will
a. become smaller. b. become larger. c. depend on the thickness of the sheet. d. not be affected.