The speed of sound does NOT depend on:
a. the medium sound travels through.
b. the air pressure.
c. the temperature.
d. the type of gas.
e. the altitude.
b
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Which Terrestrial planet has the lowest density atmosphere (i.e. none)?
a) Venus b) Mercury c) Mars d) Jupiter e) Earth
A 6.00-m length of rope has a mass of 700 g. It is pulled taught with a force of 100 N. What is the speed of waves on the rope?
A) 29.3 m/s B) 11.7 m/s C) 42.0 m/s D) 3.42 m/s E) 4.20 m/s
Which of the following is not an observed characteristic of the cosmic microwave background?
A) It contains prominent spectral lines of hydrogen, the primary chemical ingredient of the universe. B) It has a perfect thermal radiation spectrum. C) Its temperature is a little less than 3 Kelvin (3 degrees above absolute zero). D) Its temperature is the same everywhere, except for small variations at the level of 1 part in 100,000.
A simple circuit has a total resistance of 30 ?. If a 2.0-A current is maintained in this circuit, how much energy is dissipated in this circuit in 4.0 seconds?
A) 24 J B) 4.8 J C) 48 J D) 480 J E) 6.0 J