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A 77.1 kg man is riding an escalator in a shopping mall. The escalator moves the man at a constant velocity from ground level to the floor above, a vertical height of 4.43 m. What is the work done on the man by the gravitational force?
A bird stands on an electric transmission line carrying 3100 A. of current. The line has 4.0E-05 ohm resistance per meter, What voltage does the bird feel
questiona common misconception is that current is used up and steadily declines as it progresses through a series of
A galvanometer whose full scale current is 150amps and coal resistance is 75ohms is used with a 1.50 ohms shunt resistor to make an ammeter. what is the largest current that can be measured by the ammeter.
An electron enters a magnetic field with a speed of 1.41x 10^6 m/s heading north and undergoes a semicircular path towards the east with a diameter of 10cm. find the time required to complete this semicircle
a 55 kg swimmer is standing on a stationary 175 kg floating raft. the swimmer then runs off the raft horizontally with a velocity of + 3.7 m/s realtive to the shore. Find the recoil velocity that the raft would have
While running, a person dissipates about 0.524 J of mechanical energy per step per kilogram of body mass. If a 65.5 kg person dissipates a power of 76.6 W during a race, explain how fast is the person running?
Two cylindrical metal rods-one copper, the other lead-are connected in parallel with a temperature of 22.0 C at one end, what is the diameter of the copper rod
Is the momentum change identical? If not, the ball would have the larger momentum change throughout the collision with the wall?
Consider the Earth and a cloud layer 900 m above the planet to be the plates of a parallel-plate capacitor. (a) If the cloud layer has an area of 1.0 km2 = 1000000 m2, what is the capacitance?
A current of 7.37 A in a solenoid of length 14.8 cm creates a 0.369-T magnetic field at the center of the solenoid. How many turns does this solenoid contain
You heat a 585 cm3 sample of a substance from 129°C to 283°C, Calculate the coefficient of volume expansion of this substance
Compare the magnitudes of the gravitational force of attraction and the electric force of attraction between the electron, Find the ratio of the electric force to the gravitational force
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