When a pulse of white light is incident on a piece of glass, the first color to emerge is
A) red.
B) orange.
C) green.
D) violet.
E) all the same
Answer: A
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What is the proper abbreviation for ‘kilohertz?'
a. kh b. khz c. Khz d. KHz e. kHz
A supersonic plane passes overhead at a speed of 500 m/s. If you hear the sonic boom (shock wave) 4.00 s after the plane is directly overhead, at what altitude is the altitude the plane flying? Assume the speed of sound in air is 340 m/s
A) 1.36 km B) 2.16 km C) 1.85 km D) 2.45 km E) The plane is not flying fast enough to produce a shock wave.
Suppose there are 2 moles of a gas in a container of fixed size and the average spacing of molecules in the container is 4.0 nm. If an additional 14 moles of the gas are added to the container and thermal equilibrium is established, what is the new average spacing of the molecules?
a. 2.0 nm c. 1.4 nm b. 0.50 nm d. 2.8 nm
When you toss a ball upward, after the ball leaves your hand
A) the force of your hand moves it up and gradually changes direction. B) the upward force changes direction at the top of the path. C) we see that force and velocity are essentially the same thing. D) none of the above