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A camera is equipped with a lens with a focal length of 23 cm. When an object 2.2 m (220 cm) away is being photographed, how far from the film should the lens be placed?
______cm
To store the energy produced in 1hour by a 110 electric power plant, how many cubic meters of water will have to be pumped from the lower to the upper reservoir? Suppose the upper reservoir is 510 meters above the lower one, and we can neglect the sm..
Blocks A and B are connected across a frictionless pulley by a cord of negligible weight. If block B lies on a horizontal, frictionless surface and block A hangs vertically, what can be said about the acceelration of block B?
A 45.0kg girl is standing on a 170 kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.53m/s relative to the plank.
You drive your 1,345-kg car at a constant speed of 23 mph a distance of 71 m down a ramp that has a grade of 14 %. Define positive direction in the forward direction
A weather balloon filled with helium gas has a volume of 279 m3, What is the new volume of the balloon
A certain organ pipe, open at both ends, produces a fundamental frequency of 256 in air.If the pipe is filled with helium at the same temperature, what fundamental frequency will it generate ? Take the molar mass of air to be 28.8 and the molar ma..
Consider two parallel wires placed 0.0430 m apart. One wire carries a current of 6.16 A and the other wire carries a current of 7.88 A. Find the force per length
If she is served 200 of coffee at 85 in a well-insulated container, how much ice at 0 must she add to obtain a final temperature of 33.
A 0.140-kg baseball is dropped and reaches a speed of 1.20 m/s just before it hits the ground and bounces. What is the change of the ball's momentum during the bounce
Vector A has a magnitude of 10m and makes an angle of 78o with the positive x axis. Vector B also has a magnitude of 13m and is directed along the negative x axis. Enter your answers in distance then angle (in degrees).
Two 2.50-cm-diameter disks spaced 1.70mm apart form a parallel-plate capacitor. The electric field between the disks is 5.00×105V/m. What is the voltage across the capacitor
Sam, whose mass is 76.0 , takes off down a 52.0 high, 10.0 slope on his jet-powered skis. The skis have a thrust of 200 . Sam's speed at the bottom is 40.0. Illustrate what is the coefficient of kinetic friction of his skis on snow?
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