True or False? (a) As described by the definition of capacitance C = Q/?V, it follows that the potential difference across an uncharged capacitor is zero
1.True
2.False
1
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I take 2.0 kg of ice and dump it into 2.3 kg of water and, when equilibrium is reached, I have 4.3 kg of ice at 0°C. The water was originally at 0°C. The specific heat of water = 1.00 kcal/kg/°C, the specific heat of ice = 0.500 kcal/kg/°C, and the latent heat of fusion of water is 80.0 kcal/kg. The original temperature of the ice was
a. one or two degrees below 0°C. b. –46.0°C. c. –184°C. d. 184°C. e. The whole experiment is impossible.
A general rule for estimating the distance in kilometers between an observer and a lightning bolt is to count the number of seconds between seeing the lightning and hearing it, and dividing by
A) 2. B) 3. C) 4. D) 5. E) none of the above
The amount of heat needed to raise the temperature of 1 gram of water by 1°C is
v
The angular velocity of a 755-g wheel 15.0 cm in diameter is given by the equation
?(t) = (2.00 rad/s2 )t + (1.00 rad/s4 )t3. (a) Through how many radians does the wheel turn during the first 2.00 s of its motion? (b) What is the angular acceleration (in rad/s2 ) of the wheel at the end of the first 2.00 s of its motion?