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Say the electrical company needs to step down the voltage from 7200V RMS in the power line behind your house to the required 120V RMS. If they have a transformer with 1000 coil loops on the primary side, how many loops must be on the secondary side?
A cannonball (20kg) is shot from a cannon(200kg) with a velocity of 20m/s. what is the backwards velocity of the cannon
assuming each galaxy contains the mass of 200 billion suns and there are 200 billion such galaxies, what is the schwarzschild radius of the universe
A structural I beam is made of iron. A view of its cross-section and its dimensions is shown in the figure, where d = 2 cm, w = 29 cm, h = 30 cm, How many atoms are there in this section
A girl whirls a stone attached to a string 1.0m long in a circle with uniform speed. calculate the force provided by the rope to maintain the circular motion of the stone if the mass of the stone is 30.0g
The angular speed can be represented as ? = (rad/s)(1 rev/2p rad) = 2.53e7 rev/s. The electrons travel around a circle of radius .07m, 25 million times per second. What is the period of revolution of the electrons
A 47% efficient device uses chemical energy to generate 550J of electric energy. How much chemical energy is used
It compresses the spring, and then is pushed back in the opposite direction by the spring, eventually losing contact with the spring.
under controlled darened conditions in the laboratory, a light receptor cell on the retina of a person's eye can detect a single photon of light of wavelength 506nm, What is the intensity in W/m^2 deleivered to a rod
A 116-rad dose of radiation is administered to a cancer patient (mass = 76) kg). how much energy is absorbed
A neutron turns into a proton and an electron. The electron goes in one direction and the proton goes in the opposite direction. find the maximum separation distance of the two particles
A horizontal circular platform rotates counterclockwise about its axis at the rate of 0.887 rad/s. Calculate the total angular momentum of the system
An isolated hollow spherical conducting shell has a charge of 10^-6 C. In some manner, a point charge of 3*10^-6 C is placed inside the cavity of the shell,find the charge on the inner surface of the shell
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