From the energy that is input into an engine on each cycle, 500 kJ of mechanical work are produced and 600 kJ of heat are exhausted into the environment. What is the efficiency of the engine?

A)

45.5%

B)

28.6%

C)

90.0%

D)

75.0%

E)

83.3%


A

Physics & Space Science

You might also like to view...

Which is NOT true about neutron stars?

A. They have radii much larger than the Sun. B. They sometimes are observed as pulsars. C. They sometimes remain after a supernova. D. They are rapidly rotating. E. They have strong magnetic fields.

Physics & Space Science

A skydiver of 75-kg mass has a terminal velocity of 60 m/s. At what speed is the resistive force on the skydiver half that when at terminal speed?

a. 15 m/s b. 49 m/s c. 30 m/s d. 42 m/s e. 36 m/s

Physics & Space Science

Light of wavelength 687 nm passes through a single slit that is 0.75 mm wide. At what distance from the slit should a screen be placed so that the second dark fringe in the diffraction pattern is to be 1.7 mm from the center of the pattern?

A) 1.9 m B) 1.5 m C) 0.93 m D) 1.1 m E) 0.39 m

Physics & Space Science

An ac signal is applied across a 40-mH inductor and a 100-? resistor. If the power factor of this circuit is 0.40, what is the frequency of the ac signal?

A) 160 Hz B) 910 Hz C) 410 Hz D) 600 Hz E) 200 Hz

Physics & Space Science