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Q. An FM radio station transmits at a frequency of 120 MHz and a total power of 60 kW. How many photons does this station emit each second?
Q. when combing your hair, you transfer electrons from your hair onto the comp. is your hair then positively or negatively charged? how about the comb?
What is the linear speed of the phonograph needle
Find out the tension in the strap; given that the suitcase moves with constant speed and that the coefficient of kinetic friction between the suitcase and the floor is 0.40.
A car drives north at 42 mi/h for 10 {rm min} and then turns east and goes 5.0 {rm mi} at 62 mi/h. at last, it goes southwest at 30 mi/h for 6.0 {rm min}.
A 100 kg crate is being pushed across the horizontal floor by a force that makes an angle of 30.0° below the horizontal. The coefficient of kinetic friction is 0.230. What must be the magnitude of, so that the net work completed by it and the kinetic..
A hotel elevator ascends 110 {rm m} with a maximum speed of 4 {rm m/s}. Its acceleration and deceleration both have a magnitude of 1.20 {rm m/s^2}.
A particle undergoes a displacement Δr of magnitude 57 m in a direction 25° below the x axis. Express Δr in terms of the unit vectors x and y.
How long would it take you to cover the 83 length of the walkway if, once you get on the walkway, you at once turns around and start walking in the opposite direction with a speed of 1.7 relative to the walkway.
What is an acceleration of two falling sky divers (mass 100.0 kg including parachute) when the upward force of air resistance is equivalent to one-fourth of their weight. How fast would the father be moving.
An airplane maintains a speed of 567 km/h relative to the air it is flying through as it makes a trip to a city 745 km away to the north.
At one instant a bicyclist is 28 m due east of a park's flagpole, going due south with a speed of 8 m/s. after that, 11 s later, the cyclist is 65 m due north of flagpole, going due east with a speed of 10 m/s.
What is current temperature and peak wavelength What is the proper description of their situation
A number of people are riding in a hot-air balloon. The combined mass of the people and balloon is 281 kg. The balloon is motionless in the air, since the downward-acting weight of the people and balloon is balanced by an upward-acting 'buoyant' f..
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