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1. A sound wave with a sound level (Beta) of 80.0 dB is incident on an eardrum of area 0.600 x10 ^-4 m^2. how much ebergy is absorbed by the eardrum in 3 minutes?
2. At point A, 3,00 m from a small source of sound that is emitting uniformly in all directions, the sound level is 53.0 dB.
a) what is the intensity of the sound at point A?
b) How far from the source would the intensity of the sound be 1/4 the intensity at point A?
c) How far from the source would the sound level be 1/4 of the sound level at point A?
The minimum distance required to stop a car moving at 34 mi/h is 42 ft. What is the minimum stopping distance for the same car moving at 64.0 mi/h, assuming the same rate of acceleration.
Show that the force between parallel wires carrying currents I1 and I2, both in the same direction, find the magnetic force on segment dI2 of wire 2.
A child looks at his reflection in a spherical Christmas tree ornament 8cm in diameter, and sees his image reduced by half. How long is his face from the ornament.
A sample of ideal gas occupies a volume of one litre at atmospheric pressure and temperature, 20 C. What pressure is required to squeeze the gas into one-half litre at 40 C?
A subway train is traveling at 83 km/h when it approaches a slower train 46m ahead traveling in the similar direction at 23 km/h.If the faster train begins decelerating at 2.1 meter per second square while the slower train continues at constant s..
Light in a transparent material (index of refraction 1.333) strikes the boundary with another transparent material (n = 1.010). What is the critical angle for total internal reflection
if a 2.5 kg ball puts 118 joules of energy in a spring with a 614 n/m constant, how far is the spring compressed.
You can launch the proton from the surface of a sphere of with charge Q and radius R, from the center of a ring of charge Q and radius R, or from the center of a disk of charge Q and radius R. Which is the best choice.
On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a golf club improvised from a tool, How long was the ball flight
A grandfather's clock is calibrated at a temperature of 20 C. The pendulum is a thin brass rod with a heavy mass attached to the end. On a hot day, when the temperature is 30 C, does the clock run fast or slow? How much time does it gain or lose i..
The work done by an external force to move a -8.90charge from point a to point b is 1.80×10?3 . If the charge was started from rest and had 4.87×10^4 of kinetic energy when it reached point b, what must be the potential difference between a and b?
What is this value? In this state, the interference pattern still appears showing that each individual electron can interfere with itself.
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