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A 6.0cm tall object is placed 39cm in front of a spherical mirror. It is desired to produce a virtual image that is upright and 4.8cm tall. What is the focal length of the mirror?
Three forces act on a moving object. One force has a magnitude of 82.8 N and is directed due north. What must be the direction of the third force
A cryogenic storage container holds liquid helium, which boils at 4.2 K. Suppose a student painted the outer shell of the container black, Determine the rate of heat loss due to radiation
You and a close friend stand facing each other. You are as close as you can get without actually touching. If a wire is attached to each of you, estimate the capacitance of this "human capacitor
You are pulling a crate across the floor. The block has a mass of 65.0 kg. You exert a horizontal force of 140. find direction of the acceleration of the crate
A narrow tube open at one end has varibale length. When a vibrating tuning fork is held near one end, What is a possible frequency of the tuning fork
A step-down transformer produces a voltage of 6.0V across the secondary coil when the voltage across the primary coil is 140V, What voltage appears across the primary coil of this transformer
A parallel-plate air-filled capacitor having area 50 cm2 and plate spacing 1.3 mm is charged to a potential difference of 710 V, find the energy density between the plates
Zinc has a work function of 4.30eV. What is the longest wavelength of light that will release an electron from a zinc surface, What is the maximum possible speed of the electron
As you think about it, you're not sure he threw the ball exactly horizontally, What is the range of speeds with which the ball might have left his hand, Enter the minimum and the maximum speed of the ball
A 9.0 V battery is connected across two large parallel plates that are separated by 4.5 mm of air, creating a potential difference of 9.0 V between the plates. What is the electric field in the region between the plates
A 240 , 50.0-cm-diameter turntable rotates on frictionless bearings at 57 . A 22 block sits at the center of the turntable. A compressed spring shoots the block radically outward along a frictionless groove in surface of the turntable. What is turn..
A steel rod has a length of exactly 0.2cm at 30degree centigrade. what will be its length at 60degree centigarde?
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