Physics Waves And Oscillations Level: Misc Level
A person standing 4 m from a wall shouts that the sound strikes the wall with an intesity of 2.5 x 10 -4 W/m squared. Assuming that the wall absorbs 20% of the incident energy and reflects the rest, what is the sound intesity level just before and after the sound is reflected.
Physics Waves And Oscillations Level: Misc Level
Sound propagating through air at 30 degrees Celcius passes through a vertical cold front into air that is 4.0 degrees celcius. If the sound has a frequency of 2400 Hz, by what percentage does its wavelength change in the crossing of the boundry.
Physics Waves And Oscillations Level: Misc Level
Particles approximately 3.0 x 10 -2 cm in diameter are to scrubbed lose from machine parts in a aqueous ulta sonic cleaning bath. Above what frequency should the bath be operated to produce wavelengths of this size or smaller.
Physics Work,Power & Energy Level: Misc Level
A 60 kg women runs up a staircase 15 m high ( vertically ) in 20 sec. a ) How much power does she expend. b) What is her horsepower rating.
Physics Kinematics Level: Misc Level
A skier coasts down a a very smooth, 10 m high slope. If the speed of the skier on the top of the slope is 5.0 m/s, what is his speed at the bottom of the slope.
Physics Force & Laws Of Motion Level: Misc Level
A 3.0 g bullet traveling at 350 m/s hits a tree and slows down unifomly to a stop while penetrating a distance of 12 cm into the trees trunk. What was the force exerted on the bullet in bringing it to rest.
Physics Force & Laws Of Motion Level: Misc Level
A student could either pull or push, at an angle of 30 degrees from the horizontal, a 50 kg crate on a horizontal surface, where the coefficiant of kinetic friction between the crate and the surface is 0.20. The crates to be moved a horizontal distance of 15 meters. a) compared with pushing, pulling requires the student to do -1) Less 2) the same 3) more work. b) Calculate the minimum work required for both pulling and pushing.
Physics Waves And Oscillations Level: Misc Level
If a wave is started up a long rope hanging from the ceiling, it will not climb at constant velocity. Why? Will the wave be traveling faster or slower at the top than the bottom? Is the tension of the rope a factor?
Physics Waves And Oscillations Level: Misc Level
What happens to the period of a simple pendulum if the length is doubled? What happens if the suspended mass is doubled?
Physics Heat & Thermodynamics Level: Misc Level
Why must a room air conditioner be set partially out of a window? Why can t it just be set in the center of a room and plugged in ? Note that we are talking about an air conditioner, not a water evaporative cooler ( swamp cooler)
Physics Heat & Thermodynamics Level: Misc Level
When an automobile engine overheats and the radiator water begins to boil, the car can still be driven some distance before catastrophic engine damage occurs. Why? What determines the onset of really disastrous overheating?
Physics Properties Of Matter Level: Misc Level
Why don't the sizes of different molecules present in a gas enter into the equations for the gas laws?
Physics Properties Of Matter Level: Misc Level
If your property must be measured with a metal tape in order to determine the amount of your property taxes, would you rather have it measured in the summer or the winter? Remember that your property will not significantly expand or contract with the change in season.
Physics Properties Of Matter Level: Misc Level
Explain why a wind blowing past the window of a building causes the window to be blown outward rather than inward.
Physics Properties Of Matter Level: Misc Level
A person sitting in a boat floating in a small pond throws a heavy anchor overboard. Does the level of the pond rise, fall, or remain the same? Explain. What if the anchor rope is too short to allow the anchor to reach the bottom?
