The temperature inside a Carnot refrigerator placed in a kitchen at 22.0°C is 2.0°C. The heat extracted from the refrigerator is 89 MJ/h. What power is needed to operate this refrigerator?
A) 1.7 kW
B) 1.8 kW
C) 1.5 kW
D) 1.9 kW
E) 1.6 kW
B
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Most of the energy during the collapse of the iron core of a supergiant star is released in the form of neutrinos—nearly massless subatomic particles that rarely interact with matter. So how is it they can blow away a stars outer shells?
A) Although they rarely interact with matter, the sheer number released during the collapse is enough to move most of the star's mass into surrounding space at incredibly high rates of speed. B) By creating a massive magnetic field that convulses in on itself, ripping away the stars outer shells C) When neutrinos exceed a certain speed, 22,300 km/s, they interact with matter quite effectively. D) By developing a temporary, but relatively strong positive charge
Earth is farthest from the Sun in July and closest to the Sun in January. During which Northern Hemisphere season is Earth moving fastest in its orbit?
A) Spring B) Summer C) Fall D) Winter
When you drag a toy teddy bear along the floor by a force that is parallel to the floor, the magnitude of the force of friction
A. is independent of velocity or acceleration. B. increases when the velocity increases. C. is proportional to the acceleration. D. decreases when the force parallel to the floor increases. E. increases when the force parallel to the floor increases.
What is (are) the location(s) of the low tide(s) on Earth caused by the gravitation of the Moon? Give the location(s) relative to the line through the Earth's and Moon's centers, line EM
a. the point on EM on the Earth's surface nearest to the Moon b. the point on EM on the Earth's surface farthest from the Moon c. the points on the Earth's surface perpendicular to EM at the Earth's center d. the points on EM on the Earth's surface nearest to and farthest from the Moon