Mineral sample #2 is ________
a. Apatite - Ca5(PO4)3(F,Cl,OH)
b. Corundum - Al2O3
c. Quartz - SiO2
Answer: c. Quartz - SiO2
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If an object has a multiplicity ? that decreases as its thermal energy U increases, its temperature would
A. be always zero. B. be always positive (and nonzero). C. be negative (and nonzero). D. increase as U increases. E. decrease as U increases
A particle is moving the +x direction at speed c/2 . Another particle is moving in the –x direction at speed c/2 toward the first particle. Which of the following best describes the speed of one particle as seen by an observer moving with the other particle?
a. c b. some value less than 3c/4 c. some value more than 3c/4 d. 3c/4
A student pulls a box of books on a smooth horizontal floor with a force of 100 N in a direction of 37.0° above the horizontal. The mass of the box and the books is 40.0 kg
(a) Draw the free-body diagram for the box. (b) Calculate the acceleration of the box. (c) Calculate the normal force acting on the box.
The discovery of ________ at Bell Labs strongly supported the Big Bang
A) pulsars B) the cosmic microwave background radiation C) acoustic waves in the early universe D) the first generation of stars E) the Hubble law