When Earth overtakes Mars, the outer planet retrogrades near ________
Fill in the blank(s) with correct word
opposition
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A depression on the land surface caused by the collapse of a cavern is called
a. a sinkhole. b. a shrink pit. c. a culvert. d. none of the above.
The cosmic background radiation comes from a time
a. when protons and neutrons were first formed. b. when the big bang first began to expand. c. during the inflationary period. d. when gamma rays had enough energy to destroy nuclei. e. when electrons began to recombine with nuclei to form atoms.
Two identical pith balls supported by insulating threads hang side by side and close together, as shown below.
One is positively charged; the other is neutral. We can conclude that
A. all field lines leaving the positively charged pith ball end on the neutral pith ball. B. some of the field lines leaving the positively charged pith ball end on the neutral pith ball. C. none of the field lines leaving the positively charged pith ball end on the neutral pith ball. D. positive charge is transferred along the field lines until both balls have equal charges. E. positive charge is transferred along the field lines until both balls hang along vertical lines.
A 3.0-kg mass sliding on a frictionless surface has a velocity of 5.0 m/s east when it undergoes a one-dimensional inelastic collision with a 2.0-kg mass that has an initial velocity of 2.0 m/s west. After the collision the 3.0-kg mass has a velocity of 1.0 m/s east. How much kinetic energy does the two-mass system lose during the collision?
A. 22 J B. 24 J C. 26 J D. 20 J E. 28 J