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A commuter train blows its 200-Hz horn as it approaches a crossing. The speed of sound is 335 m/s.
(a) An observer waiting at the crossing receives a frequency of 208 Hz. What is the speed of the train?
(b) What frequency does the observer receive as the train moves away?
find out the current in the loop.Determine the rate at which thermal energy is produced.
Stopping a 747 A 747 jetliner lands and begins to slow to a stop as it moves along the runway. find How far has it traveled in this time
A steel beam that is 5 m long weighs 320N. It rests on two supports, 3.00 m apart, with same amounts of the beam extending from each end. Suki, who weighs 525N, stands on the beam in the center and then walks toward one end. How close to the end c..
A skateboarder, starting from rest, rolls down a 12.5 m ramp. When she arrives at the bottom of the ramp her speed is 6.10 m/s. Determine the magnitude of her acceleration
A 78 kg circus performer jumps from a 4.20 m height onto a trampoline and stretches it downward 0.3m. suppose that the trampoline obeys Hooke's law.
express What is the light intensity on a wall. How far does the ball drop vertically by the time it reaches the plate 18.0 m away.
Three applied forces, F1= 20.0 N, F2= 40.0 N and F3= 10.0 N act on an object with a mass of 2.00 kg which can move along an inclined plane. What is the amount of work done by the gravitational force as the object moves up the inclined plane
A Geiger counter consists of a tube of radius r and legnth L centered around a positively charged filament of equal length. What answer do you get for the linear charge density of the filament if you approximate its length to be infinite
It's possible to estimate the percentage of fat in the body by measuring the resistance of the upper leg rather than the upper arm, What are the fractions of muscle and fat in the leg
A nichrome toaster wire, initially at room temperature, carries 2.72A immediately after it's turned on. After the wire heats, the current drops to 2.44A
a spring contant k=11.75 N/m is hung vertically. What is the displacement of the end of the sprig due to the weight of the 0.500kg mass
Small telescopes are often advertised as "200 power" or "magnifies 200 times." As someone knowledgeable about astronomical telescopes, how would you progress such advertisements.
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