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You are taking a photograph of a poster on the wall of your dorm room, therefore you can't back away any farther than 2.0 meter to take the shot. The poster is 0.80 meter wide and 1.2 meter tall, and you want the image to fit in the 24 × 36 mm frame of the film in your camera. Find the longest focal length lens that will work?
What plate separation is required for a parallel plate.
A loudspeaker of mass 22.0 {rm kg} is suspended a distance of h = 1.60 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.90 {rm m}.
There are four charges, each with a magnitude of 1.6 µC. Two are positive and two arenegative. Find the magnitude of the net electrostatic force experienced by any charge
Two spacecraft carrying identical pendulum gravity meters have landed on Mars, one at the equator and one at the North pole. Over a fixed period of time the pendulum at the equator is observed to oscillate 250 times compared with 251 times at the ..
A 3.0-V battery with an internal resistance of 2.5 Ω is connected to a lightbulb of a resistance of 6.0 Ω. How much electric power is wasted in the internal resistance
assume a construction worker bangs his hammer on average 1100 times a day. how many stress cycles would this produce in
Suppose you have to move a heavy crate of weight 875 N by sliding it along a horizontal concrete floor. What is the magnitude Fp of the minimum force you need to exert on the crate to make it start sliding along the floor
Neglect air resistance during the descent. She comes to rest 3.00 m under the surface of the water. Identify the average force that the water exerts on the diver. This force is nonconservative.
As shown in the figure below, a light string that does not stretch changes from horizontal to vertical as it passes over the edge of a table. The string connects m1, a 3.60 kg block, originally at rest on the horizontal table at a height 1.30 m ab..
In a closed subway car, a girl holds a helium-filled balloon by a string. While the car is travelling at constant velocity, the string of the balloon in exactly vertical.
An aluminum cup of mass 210 g contains 800 g of water in thermal equilibrium at 80.0°C. find At what rate is energy being removed by heat
A "diving bell" is a tube or pipe that is closed at the top and open at the bottom. It is lowered into a body of water with the open end down so that air is trapped inside, Find the absolute pressure of the air in the bell
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