A swimming pool heater has to be able to raise the temperature of the 50 000 gallons of water in the pool by 12.0 C°. How many kilowatt-hours of energy are required? (One gallon of water has a mass of approximately 3.8 kg and the specific heat of water is 4,186 J/kg/°C.)
a. 6.98E+2 kWh
b. 2.65E+3 kWh
c. 2.21E+2 kWh
d. 2.65E+4 kWh
e. 2.65E+2 kWh
b
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If the temperature of 2.000 moles of an ideal gas is increased by 50
C then what is the increase in the total internal energy?
A. 1,247 J B. 1,980 J C. 2,250 J D. 2,750 J E. 3,030 J
A stone is thrown from the top of a building with an initial velocity of 20 m/s downward. The top of the building is 60 m above the ground. How much time elapses between the instant of release and the instant of impact with the ground?
a. 2.0 s b. 6.1 s c. 3.5 s d. 1.6 s e. 1.0 s
A ________ lens is used to compensate for hyperopia
Fill in the blank(s) with correct word
Two loops of wire are arranged so that a changing current in one, the primary, will induce a current in the other, the secondary. The secondary loop has twice as many turns as the primary loop. The current in the primary at this moment is 3 A and increasing. The current in the secondary must be
a. 3 A. b. 6 A. c. zero. d. There is insufficient information to work this problem.