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An alert physics learner stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 475 Hertz when the train is approaching him and 460 Hertz when the train is receding from him. Using these frequencies, obtain the speed of the train.
__________m/s
A cell membrane has a surface area of 1.00 x 10-7 m2, a dielectric constant of 5.17 and a thickness of 8.17 nm. How many positive ions are there on the outside of the membrane
A 9.5 kg mess kit sliding on a frictionless surface explodes into two 4.75 kg parts, one moving at 1.5 m/s, What was the original speed of the mess kit
can two monochromatic sources of significant frequency difference produce an observable interference pattern?in a
If the coefficient of static friction is 0.500, what minimum force magnitude is required from the rope to start the crate moving
The Earth's radius is 6370 km . There is a downward-pointing electric field in the atmosphere above the Earth's surface, What is the flux of the electric field out of the Earth, What is the charge on the Earth
For the infinite square well problem an electron spends 40% of its time in the n=3 state and 60% of its time in the n=5 state. What is the average energy of the electron
a bullet 2.00 cm long is fired straight through a board 10 cm thick. the bullet strikes the board at speed of 420ms and
In order to pass a physical fitness test, Marcella must run 1000 m at an average speed of 3.90 m/s. How much time does she have to run the last 750 m
Kathy tests her new sports car by racing with Stan, an experienced racer. Both start from rest, Find the distance she travels before she catches him
An ice chest at a beach party contains 12 cans of soda at 4.93 °C. Each can of soda has a mass of 0.35 kg, determine the final temperature T of the soda and watermelon in degrees Celsius
kathy places one end of a copper rod in heat reservoir and the other end in a heat sink. by what factor is the rate of
A violin string, fixed at both ends, is made to oscillate and a standing wave, with three antinodes, is created. Discover the wavelength of this wave if the length of the string is L. If the tension in the string is increased by a factor of four, wha..
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