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(a) The electric field just above the surface of the charged drum of a photocopying machine has a magnitude E of 3.00×105 N/C. What is the surface charge density of the drum, assuming that the drum is a conductor?
(b) The drum of the photocopying machine in the problem above has a length of 48 cm and a diameter of 9 cm. What is the total charge on the drum?
(c) The manufacturer wishes to produce a desktop version of the machine. This requires reducing the size of the drum to a length of 29 cm and a diameter of 7 cm. The electric field at the drum surface must remain unchanged. What must be the charge on this new drum?
The position of an air-track cart that is oscillating on a spring is given by the equation x = 12.4 cos[(6.35 s-1)t] . At what value of t after t= 0.00s in the cart first located at x = 8.47 cm ?
A wheel 45.0 cm in diameter accelerates uniformly from 206rpm to 340 rpm in 7.0 s. How far will a point on edge of the wheel have travelled in this time.
A car drives north at 48 for 10 and then turns east and goes 5 at 62 . Finally, it goes southwest at 24 for 6. Determine the cars displacement.
Suppose a car starts from rest and completes a straight line, 1/4 mile (402 meter) race in 12.3 seconds. Assume the acceleration to be constant.
What was the velocity of the bullet just before it struck the wooden block? The length of the string is 2 meters.
A ramp is 25 meters long and is inclined at 30 degrees with the horizontal. A block of mass 25 is pulled up at a constant acceleration of 1 m/s2. The coefficient of kinetic friction is 0.15. If the box starts at rest from the bottom, what would be..
Fred and Barney are two electric charges that are to begin with held 1 meter apart and experience an electric repulsion of 10 pounds of force. What would be the force of repulsion between them be if the two were moved closer together so that they ..
A circular loop in the plane of the screen lies in a 0.60 T magnetic field pointing into the screen. The loop's diameter changes from 18.5 cm to 6.0 cm in 0.50 s.
A copper-bottomed kettle, its bottom 24 cm in diameter and 3.0 mm thick, sits on a burner. The kettle holds boiling water, and energy flows into the water from the kettle bottom at 800 W.
How high a tree would a 79.0 kg person have to climb to increase his gravitational potential energy relative to the ground by that amount.
Even as exploring a sunken ocean liner, principal researcher found the absolute pressure on the robot observation submarine at the level of the ship to be about 413 atmospheres. The density of seawater is 1025kg/m^3.
A baloon 1.2 g when empty has volume 800 cm ^3 and is filled with helium. density of air is 1.29 kg/m^3 while that of helium is .179 kg/m, calculate acceleration of balloon
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