#1a 1.5m wire carries a 7 a current when a potential difference of 99 v is applied. what is the resistance of the wire? your answer units#2a clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use? your answer            units

What is tan(61)? а. 1.80 b. 0.49 c. 0.61 d. 0.87

Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?

John throws .4 kg ball with velocity of 18 m/s. hits .2 kg bottle and bottle flies 25 m/s. how fast is ball traveling after hitting the bottle?