The SI units for k, the spring constant, are equivalent to:
a. J
c. kg / s2
b. J / N
d. none of the above
C
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Astronauts are weightless inside the International Space Station because
A) the station and the astronauts are constantly falling toward Earth. B) the station has rockets that fire to counteract Earth's gravity. C) there is no gravity in space. D) the station is too far from Earth for gravity to be noticeable. Answer: A
Where is it low tide?
A) point 1 only B) point 2 only C) points 1 and 3 D) points 2 and 4
Light of wavelength 575 nm falls on a double-slit and the third order bright fringe is seen at an angle of 6.5°. What is the separation between the double slits?
A) 5.0 ?m B) 10 ?m C) 15 ?m D) 20 ?m E) 25 ?m
The cooling efficiency of an average new heat pump (in Btu/(Wh)) is 8.70 . The most efficient unit has a cooling efficiency of 16.4 . A heat pump typically lasts 14 yr
How much more energy will the less efficient heat pump use over its lifetime? Describe the assumptions you must make to answer this question.