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6. In a film projection apparatus it is desired to produce pictures12 feet wide on a screen 50 feet from the lens; the size of the picture on the film is 1 inch wide. What must be the focal length of the projection lens used?
After having collected samples along the shore all day long, a marine biologist walks back to her campsite, 1.69 km away. Her dog runs ahead, at twice the speed, reaches the campground and turns around until it meets her again. Then, the dog proce..
A 32.5-g glass thermometer reads 24.1?C before it is placed in 131mL of water. What was the original temperature of the water
A light bulb is placed 22.3 cm in front of a concave mirror. Calculate the focal length of the concave mirror
You are running toward an approaching marching band. You are moving at 9.3 m/s and the band is moving at 2.7 m/s
A car is driving 22.7m/s flat ground drives off 42.3 m high cliff. How much time does it take to reach the ground.
What is magnitude of the Coulomb force
A person weighing 119 pounds can run up 500 steps, How much power did the person expend running up the steps
A father racing his son has 1/2 the kinetic energy of the son, who has 1/3 the mass of the father, What are the original speeds of (b) the son
A production line inspector wants a mirror that produces an upright image within magnification of 7.4 when it is located 15 mm from a machine part.
A barbell spins around a pivot at its center at A. The barbell consists of two small balls, each with mass 400 grams (0.4 kg), at ends of a very low mass rod of length d = .6 m. The barbell spins clockwise with angular speed 20 radians/s.
A fully loaded station wagon has a mass of 1690 kg. If each of its four tires is inflated to a gauge pressure of 211 kPa, what is the total tire area in contact with road.
A bucket filled with dirt of mass 20 kg is suspended by a rope that hangs over a pulley of mass 30 kg and radius 0.25 m. Everything is initially at rest.
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