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A. You have a candle and a screen, separated by a distance D. One of your lens' can project an image of that candle on that screen when it is a distance D/4 from the screen. When the two lens' are put together, they can project an image of the candle on the screen when the combination is halfway between the two. What is the focal length of the first lens?
B. What is the focal length of the combined lens?
C. What is their combined focal length?
A 4.35 kilogram ball is dropped from the roof of a building 170.2 m high. Obtain how far from the building does the ball hit the ground
A nonreflective coating (n = 1.35) covers the glass (n = 1.52) of a camera lens. determine the minimum nonzero thickness that the coating can have
A child throws a ball with an initial speed of 8.00 m/s at an angle of 40.0° above the horizontal. The ball leaves her hand 1.00 m above the ground and experience negligible air resistance. I know how to calculate the velocity before the ball hits th..
The drawing below shows an inverted "A" that is suspended from the ceiling by two vertical ropes. Each leg of the "A" has alengh of 2L and a weight of 120.0 N. The horizantal crossbar has a negligible weight. Find the force that the crossbar applies ..
Newton's equation for force.
In some places, insect "zappers", with their blue lights, are a familiar sight on a summer's night. These devices use a high voltage to electrocute insects.
A point charge -Q is at the center of a spherical conducting shell of inner radius R1 and outer radius R2, What is the charge on the inner surface of the shell
Ground beef may be irradiated with high-energy electrons from a linear accelerator to kill pathogens. Estimate the temperature increase of the beef due to this procedure
a golf ball rolls off a horizontal cliff with an initial speed of 13.9 ms. the ball falls a vertical distance of 15.0 m
A battery with an emf of 12.0 V shows a terminal voltage of 11.4V when operating in a circuit with two lightbulbs, What is the battery's internal resistance
A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 17.0° below the horizontal. Find the length of time the car is in the air
You are standing at rest with respect to the earth holding a lance which you measure as 10 meters long. Which lance hits the other person first
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