A 16.0-kg mass and a 2.25-kg mass are connected by a light string over a massless, frictionless pulley. If g = 9.8 m/s2, what is the acceleration of the system when released?
a. 13.0 m/s2
b. 7.38 m/s2
c. 179 m/s2
d. 9.80 m/s2
e. 1.86 m/s2
b
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Besides Earth, which terrestrial planet also has seasons?
A. Mercury B. Mars C. Venus D. Seasons are unique to Earth.
A wave that requires a medium through wave which to travel
a) Electromagnetic wave b) Mechanical wave c) Longitudinal wave d) Transverse wave
A heat engine absorbs 2 500 J of heat from a hot reservoir and expels 1 000 J to a cold reservoir. When it is run in reverse, with the same reservoirs, the engine pumps 2 500 J of heat to the hot reservoir, requiring 1 500 J of work to do so. Find the ratio of the work done by the heat engine to the work done by the pump. Is the heat engine reversible?
a. 1.0 (no) b. 1.0 (yes) c. 1.5 (yes) d. 1.5 (no) e. 2.5 (no)
How many basic units does the SI system have?
A) three B) four C) five D) seven E) ten