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1-A swimmer wants to swim straight across a river with current flowing at a speed of v1 = 0.27 km/h. If the swimmer swims in still water with speed v2 = 0.81 km/h, at what angle should the swimmer point upstream from the shore and at what speed v will the swimmer swim across the river?
2-In the 1887 experiment by Michelson and Morley, the length of each arm was 11 m. The experimental limit for the fringe shift was 0.005 fringes. If sodium light was used with the interferometer ( λ = 589 nm), what upper limit did the null experiment place on the speed of the Earth through the expected ether?
3-Astronomers discover a planet orbiting around a star similar to our sun that is 15 light years away. How fast must a rocket ship go if the round trip is to take no longer than 30 years in time for the astronauts aboard? How long will the trip take as measured on Earth?
4-A spaceship is moving at a speed ot 0.7c away from an observer at rest. A boy in the spaceship shoots a proton gun with protons having a speed of 0.8c.
(a) What is the speed of the protons measured by the observer at rest when the gun is shot away from the observer? (b) What is the speed of the protons measured by the observer at rest when the gun is shot toward the observer?
question1the index of refraction for red light in water is 1.331 and that for blue light is 1.340. if a ray of white
The wheelbase on a truck is 2.4 m wide and the truck's center of mass is located along the vertical centerline of the truck and 2.0 m above the bottom of the tires
an object at rest explodes into three pieces of equal mass. one moves east at 20.0 ms while a second moves northwest at
Point charges of -8.20 micro Coulombs are placed at each corner of a square that is 0.250m on a side. Find the electric potential at the center of a square
A transformer is to be used to provide power for a computer disk drive that needs 6.4 V (rms) instead of the 120 V (rms) from the wall outlet. Find the number of turns in the secondary
At an open-air concert a person sits at a location that is 7m and 9.10m, respectively, from speakers at each side of the stage. A musician plays a single 494 Hz tone, explain what the listener hears.
a blow-dryer and a vacuum cleaner each operate with a voltage of 120 v. the current rating of the blow-dryer is 11 a
Suzanne observes two light pulses to be emitted from the same location, but separated in time by 2.70 µs. How fast is Mark moving relative to Suzanne
A (smooth) rope of length L and mass m is placed above a hole in a table. One end of the rope falls through the hole, Find the mechanical energy lost from the rope as the end of the rope leaves the table
The area enclosed with the wire loop in the figure below is reduced from 27 cm2 to 9 cm2 in a time interval of 0.09 s. The magnitude of the magnetic field is 0.46 T. Discover the emf induced in the wire.
Suppose that a binary star system consists of two stars of equal mass. They are observed to be separated by 400 million kilometers and to take 3.0 Earth years to orbit about a point midway between them. What is the mass of each?
The magnetic field perpendicular to a single13.2 cm diametercircular loop of copper wire decreases uniformly from .750 T tozero. how much charge moves past a point in the coil during this operation
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