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Jack and Jim are resting on an offshore raft after a swim. They estimate that the horizontal distance between a trough and an adjacent crest of surface waves on the lake is 3.0m. They count that 13 waves pass by the raft in 18.0s. Calculate how fast the waves are moving.
A 250g , 25-cm-diameter plastic disk is spun on an axle through its center by an electric motor. What torque must the motor supply
A man pushes a lawn mower on a level lawn with a force of 186 N. If 35 percent of this force is directed downward, how much work is completed by the man in pushing the mower 6.5 m.
A vertical tube 1.9cm in diameter and open at the top contains 4.0g of oil (density 0.82 g/cm^3) floating on 4.0g of water. Find the gauge pressure at the oil-water interface
The unpolarized light of intensity I(not) is passed through two polarizers with axes oriented at 30degrees from each other. What intensity of light emerges
Although both stars probably formed from the same clump of gas, more massive one must have had its birth slowed so that it became a key -sequence star millions of years later than its less massive companion.
A photon with energy E collides with a stationary mass m. What is the mass and speed of this particle
A triangle has its corners located at the points (x,y) = (12.00,15.00), (x,y) = (9.00,8.00) and (x,y) = (0,0). Calculate the area of the triangle
According to the law of universal gravitation, what will happen to Earth if the Sun were somehow replaced by the black hole of same mass.
What is the peak emf of the generator when its coil rotates at a frequency of 50 Hz? Find out the frequency of the coil's rotation when the peak emf of the generator is 163 V.
At a factory, a noon whistle is sounding with a frequency of 497 Hz. As a car traveling at 84km/h approaches the factory, driver hears the whistle at frequency fi. After driving past the factory, the driver hears frequency ff. What is the change i..
ocean waves with wavelength 1.2 m and period 1.5s are moving past a pier. a boy runs along the pier, how many wave crests pass the boy each second
A parallel-plate capacitor has a capacitance of c1 = 3.5 uF when filled with air and c2 = 23 uF when filled with a dielectric oil at potential difference of 12 V. What is the permittivity of this oil
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