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(a) You're using a 20-cm-focal-length convex lens to image a small light bulb. Where should you place the bulb to get a half-size real image? (b) A movie projector uses a single lens to project a real image on a screen 6 m from the lens. Each frame of the movie film is 3 cm tall, and the image is 1.2 m tall. How far should the film be from the lens?
an astronomical telescope has an objective lens with a focal length of 102 cm and an eyepiece with a focal length of
A metal wire has a resistance of 10.0 ohms at a temperature of 20 degrees C. If the same wire has a resistance of 10.55 ohms at 90 degrees C, what is the resistance of the wire when its temperature is -20 degrees C?
a solid insulating sphere of radius a 3.1 cm is fixed at the origin of a co-ordinate system as shown. the sphere is
A stone is thrown upwards from the edge of a clif 20m high. It just misses the cliff on the way down and hits the ground below with a speed of 30m/s. a. With what velocity was it released?b. What is its maximum height above the cliff?
How fast in rpm must a centrifuge rotate if a particle 7.0 cm from the axis of rotation is to experience an acceleration of 125,000 G's
Given two vectors A=-2i+4j+6k and B = 2i+2j-3k. Write an expression for the vector difference
a hoop, a disk, and a solid sphere each have a mass 1.4kg and a diameter 16cm. find the speed of each at the bottom
A capacitor is constructed with plates of area A and separation s. The area between the plates is ?lled with a weakly ionized gas — a very poor conductive medium with resistivity = 10^8 ohms * cm. The density of the gas is so low that it has no e?e..
A sphere of radius R carries a polarization P(r)=kr, where k is a constant and r is the vector from the center, Calculate the field inside and outside the sphere
A block-spring system oscillates with amplitude of 3.40 cm. The spring constant is 250 N/m and the mass of the block is 0.500 kg. Decide the mechanical energy of the system. Decide the maximum speed of the block.
A long, straight wire carries a current of 2.70 A. An electron is traveling in the vicinityof the wire. At the instant when the electron is 4.44 cm from the wire and traveling with a speedof 7.00 104 m/s parallel to the wire inthe direction opposit..
A canister containing 150 kilogram of an ideal gas has a volume of 8.0 m x 103. If the gas exerts a pressure of 5.0 x 105 Pa, estimate what is the average speed of the molecules
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