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In order to improve sharpness of pictures, photographers sometimes decrease lens's aperture (i.e. cover part of the lens). Explain why this procedure leads to a sharper image.
A blu-ray disc has mass of 20 g and is 12 cm in diameter. The fastest drives can spin the disc at 10000 RPM after uniformly accelerating it for 1 sec. Find the net torque on the disc
A 4.00-kg block rests between the floor and a 3.00-kg block as shown in the figure. the 3.00-kg block is tied to a wall by a horizontal rope. how many forces would we draw acting on the block
A hoop and a disk, both of 0.66- m radius and 4.0- kg mass,are released from the top of an inclined plane 3.1 m high and 8.9 mlong. What is the speed of each when it reaches the bottom? Assume that they both roll without slipping.
A student drops two metallic objects into a 120-g steel container holding 150 g of water at 25°C. What is the mass of the aluminum chunk
forces acting on the arm of a person lifting a dumbbell. the force f is the force pulling on the hand due to the weight
A transverse wave on a string has an amplitude of 0.223 m and a frequency of 194 Hz. How much time passes between the first two instants when this particle has a displacement of y = 0.114 m
particles in a gold ring. you have a pure 24-karat gold ring with mass 15.0 g. gold has an atomic mass of 197 gmol and
A roller-coaster car has a mass of 506 kg when fully loaded with passengers. If the vehicle has a speed of 20.5 m/s at point , what is the force exerted by the track on the car at this point
Calculate the critical angles for the following materials when surrounded by air. Assume that ? = 589 nm
The maximum acceleration of a fast freight elevator is 4.5 m/s2. The maximum load of the elevator is 6,651 kg, and the elevator has a mass of 466 kg. If a steel cable is to be used suspend the elevator, what should the minimum diameter be? The elasti..
Two blocks with masses, 2.5kg and 3.5kg, rest on a frictionless surface and are connected by a light string, What is the magnitude of the force in the string
At one instant a bicyclist is 49m due east of a park's flagpole, going due south with a speed of 14 m/s. Then 40s later, the cyclist is 49m due north of the flagpole, going due east with a speed of 14m/s. For the cyclist in this 40s interval, what..
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