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A commuter train blows its horn as it passes a passenger platformat a constant speed of 30.0 m/s. The trainhorn sounds at a frequency of 330 Hz whenthe train is at rest.
a) What is the frequency observed by a personon the platform as the train approaches?b) What is the frequency observed by a person on the platform asthe train recedes from him?c) What wavelength does the observer find in each case?
If John Glenn weighed 640 N on Earth's surface, a) how much would he have weighed if his Mercury spacecraft had (hypothetically) remained at twice the distance from centre of Earth? b) Why is it said that an astronaut is never truly "weightles".
A little boy drops a rock off a bridge which is 58.6 meters above the river below. What is the CHANGE in speed of the falling rock between the times t=1.28 seconds and t=2.73 seconds after the boy drops the rock
A scintillator absorbs an incident flux of 5 MeV alpha particles that totals 10^6 particles/s, estimate the expected signal from the photodiode
A railroad car containing explosive material is initially traveling south at a speed of 4.5 m/s on level ground. The total mass of the car plus explosives is 2.5 104 kg. what is the final speed of the other piece
A tank circuit in a radio transmitter is a series RCL circuit connected to an antenna. compute maximum inductance of the tank circuit
How much horizontal force should a sprinter of mass 57.0 exert on the starting blocks to produce this acceleration.
A battery has an emf of 15.0 V. The terminal voltage of the battery is 11.0 V when it is delivering 22.0 W of power to an external load resistor R.
A coil has an inductance of 0.45 H and a resistance of 42 ohms. The coil is connected to a 5.6 V ideal battery. What is the total power that the battery supplies
An astronaut at rest on Earth has a heartbeat rate of 73 beats/min. When the astronaut is traveling in a spaceship at 0.87c, what will this rate be as measured by the following: (a) an observer also in the ship beats/min (b) an observer at rest on Ea..
Figure the y-component of the magnetic force acting on a segment of wire of length L = 21.0 cm
Two charged spheres are 8.45 cm apart. They are moved and the force on each of them is found to have been tripled. How far apart are they now.
Two small plastic spheres are given positive electrical charges. When they are 15 cm apart, the repulsive force between them has magnitude of 0.220N. what is the charge on each sphere
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