A jet engine develops 1.50 × 10^5 N of thrust in moving an airplane forward at a speed of 900 km/h. What is the power developed by the engine?
a. 1 350 kW
b. 380 MW
c. 37.5 MW
d. 42.5 MW
e. 32.5 MW
c
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A 1.15-kg grinding wheel 22.0 cm in diameter is spinning counterclockwise at a rate of 20.0 revolutions per second
When the power to the grinder is turned off, the grinding wheel slows with constant angular acceleration and takes 80.0 s to come to a rest. (a) What was the angular acceleration (in rad/s2 ) of the grinding wheel as it came to rest if we take a counterclockwise rotation as positive? (b) How many revolutions did the wheel make during the time it was coming to rest?
LR Circuits: As shown in the figure, a circuit consists of a resistor R = 18 ? in series with an ideal inductor L = 33 H having no resistance. At time t = 0 s, there is a 12-A current in the circuit. When the magnetic energy of the inductor is 1600 J, what is the rate of dissipation of energy in the resistor?
A. 1700 W B. 440 W C. 870 W D. 1300 W E. 2200 W
The specific of ice is 2.10 kJ/kg 
the heat of fusion for ice at 0
is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg
and the heat of vaporization of water at 100
is 2,256 kJ/kg. What is the final equilibrium temperature when 10.0 grams of ice at -15
is mixed with 40.0 grams of water at 
?
A. 59.5
B. 57.2
C. 53.6
D. 48.9
E. 42.6
A roentgen (R) is
A) 10-2 J/kg. B) 3.70 × 1010 decays/s in radium. C) the SI unit of radioactivity ( = 1 decay/s). D) the SI unit of absorbed dose = 1 J/kg = 100 rad. E) a dosage of 2.58 × 10-4 C/kg.