An 8000-kg aluminum flagpole 100-m long is heated by the Sun from a temperature of 10°C to 20°C. Find the heat transferred (in J) to the aluminum if the specific heat of aluminum is 0.215 cal/g/°C
a. 7.2 × 10^5
b. 7.2 × 10^7
c. 7.2 × 10^3
d. 7.2 × 10^1
e. 7.2 × 10^2
b
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A heat engine has an efficiency of 35.0% and its power output is 600 W. What is the rate of heat input?
A. 1.8 kW. B. 2.0 kW. C. 2.4 kW. D. 3.0 kW.
A solid cylinder is rolling without slipping. What fraction of its kinetic energy is rotational?
A) 1/3 B) 2/3 C) 1/2 D) 1/4 E) 3/4
A 0.50-m long solenoid consists of 1 000 turns of copper wire wound with a 4.0 cm radius. When the current in the solenoid is 18 A, the magnetic field at a point 1.0 cm from the central axis of the solenoid is
a. 0.090 mT. b. 0.36 mT. c. 23 mT. d. 36 mT. e. 45 mT.
A child pulls a 3.00-kg sled across level ground at constant velocity with a light rope that makes an angle 34.0° above horizontal
The tension in the rope is 5.00 N. Assuming the acceleration of gravity is 9.81 m/s2, what is the coefficient of friction between the sled and the ground? A) 0.156 B) 0.188 C) 0.0441 D) 0.0851 E) 0.103