Reply to Thread

Please answer Physics question?

1.The requirement that a heat engine must give up some energy at a lower temperature in order to do work corresponds to which law of thermodynamics?

a.Firstc. third
b.Secondd. no law of thermodynamics


2.What occurs when a system’s disorder is increased?

a.No work is donec. less energy is available to do work
b.No energy is available to do workd. more energy is available to do work


3.Which of the following is not an example of approximate simple harmonic motion (SHM)?


a.A ball bouncing on the floorc. a piano wire that has been struck
b.A child swinging on a swingd. a Harley’s radio antenna waving back and fourth


4.A simple pendulum swings in simple harmonic motion (SHM). A t maximum displacement,

a.The acceleration reaches its maximumc. the acceleration is zero
b.The velocity reaches maximumd. the restoring force reaches zero


5.For a mass hanging from a spring, the maximum displacement the spring is stretched or compressed from its equilibrium position is the system’s;

a.Amplitudec. frequency
b.Periodd. acceleration6.


6.A steam engine takes in 2.06 x 105J of energy added as heat and exhaust 1.53 x 105 J of energy removed as heat per cycle. What is its efficiency?






7.A wave on a guitar string has a velocity of 684 m/s. The guitar string is 62.5 cm long. What is the fundamental frequency of the vibrating string?