An example of a heat mover is
a. a refrigerator.
b. an air conditioner.
c. a heat pump.
d. all of the above.
e. none of the above.
d
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A reasonable estimate for the mass of an ordinary passenger car is
A) 100 kg B) 1000 kg C) 5000 kg D) 10,000 kg
An eagle, with a wingspread of 2.0 m, flies toward the north at 8.0 m/s in a region where the vertical component of the earth's magnetic field is 0.20 × 10-4 T
What emf would be developed between the eagle's wing tips? (It has been speculated that this phenomenon could play a role in the navigation of birds, but the effect is too small, in all likelihood.)
Radioactive decay was discovered in 1896 by
a. Ernest Rutherford. b. Niels Bohr. c. Henri Becquerel. d. Marie and Pierre Curie.
Buoyancy: A block of metal weighs 40 N in air and 30 N in water. What is the buoyant force on the block due to the water? The density of water is 1000 kg/m3.
A. 10 N B. 30 N C. 40 N D. 70 N