Two stereo speakers mounted 4.52 m apart on a wall emit identical sound waves. You are standing at the opposite wall of the room at a point directly between the two speakers
You walk 2.11 m parallel to the wall, to a location where you first notice that the sound intensity is essentially zero. If the wall along which you are walking is from the wall with the speakers, what is the wavelength of the sound waves? The walls are cushioned to absorb sound reflections.
A) 2.05 m B) 2.57 m C) 2.91 m D) 1.71 m
D
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True or False? (a) As described by the definition of capacitance C = Q/?V, it follows that the potential difference across an uncharged capacitor is zero
1.True 2.False
What would happen to the planets in a solar system where the central star did not have a strong wind?
A) Nothing, the star does not affect the process of planet formation. B) One planet would grow to dominate all the others and gravitationally eject them out of the system. C) All planets would continue to grow to large sizes but their orbits would be unchanged. D) The gas in the solar nebula would create a drag on the planets and their orbits would migrate inwards. E) The gas in the solar nebula would create a drag on the planets and their orbits would migrate outwards.
While the gondola is rising at a speed of 5.0 m/s, a passenger in a balloon-supported gondola throws a small ball up at a speed of 2.0 m/s relative to his body. A person who measures the ball's velocity at the instant of release will find that the ball's velocity relative to the ground at that instant is
a. 2.0 m/s, up. b. 2.8 m/s, down. c. 3.0 m/s, up. d. 5.0 m/s, up. e. 7.0 m/s, up.
Consider a light bulb, in empty space, radiating 200. watts with its filament heated to 2800.°C. Assuming it is a good approximation to a black body
(a) What is the area of the filament? (b) If placed in an oven, with walls at 800.°C, what is its net power radiated now?