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A sound wave travels in air toward the surface of a freshwater lake and enters into the water. The frequency of the sound does npt change when the sound enters the water. The wavelength of the sound is 2.49 m in the air, and the temperature of both the air and the water is 20 oC. What is the wavelength in the water?
Calculate the final equilibrium temperature assumning no heat loss after mixing occurs.
a car traveling due east at 20 m/s reverses its direction over a period of 10 seconds so that it is traveling due west at 20 m/s. What is the direction of the car's average acceleration over this period?
A 1 kg ball is attached to a 2 m long piece of very light string and suspended in such a way that it can freely swing and it passes just above the ground. completely describe the motion of the two masses after the 1 kg ball is released
A train car with mass m1 = 527 kg is moving to the right with a speed of v1 = 8 m/s and collides with a second train car, What is the mass of the second train car
A rifle with a barrel length of 62 cm fires a 12 g bullet with a horizontal speed of 460 m/s/s. The bullet strikes a block of wood and penetrates to a depth of 15 cm.
Consider a constant net force of 15.0 N acting on 22 degrees below the x-axis, find the work done by the net force.
a red car and a green car move toward each other in adjacent lanes and parallel to an x axis. At time t = 0, the red car is at xr = 0 and the green car is at xg = 211 m.
A 250 g block of wood hangs from a light string 0.78 m long. The block is shot with a bullet of mass 4.2 g, what was the velocity of the bullet just before it hit the block
Shaving/makeup mirrors typically have one flat and one concave (magnifying) surface. compute the focal length of the mirror
Treating our rigid legged friend as a particle, what is the average force his feet exert on the ground as he slows down.
Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115.°F. How much space now exists between each rail
Hair dryer draws a current of 9.2a. How long does it take 1.9*10^3 C of charge pass through? How many electrons does this represent.
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