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Question1
A long solenoid has 100 turns/cm and carries a current i. An electron moves within the solenoid in a circle of radius 0.021 cm perpendicular to the axis of the solenoid. The speed of electron is 0.042c (c is the speed of light).What is the current i?
Question2
Assume a crate of mass 8.8 kg is placed on the plank at a distance x = 4.5 m from the left end. If the plank has a mass of 12 kg, find the forces exerted by the two supports on the plank.
Question3
A ball is thrown straight down with an initial velocity of 15 m/s. At accurately the same time, a second ball is thrown straight down from a position 5 m straight below the first ball. The initial velocity of the second ball is 2 m/s. How long after being thrown will the balls collide?
The unpolarized light of intensity I(not) is passed through two polarizers with axes oriented at 30degrees from each other. What intensity of light emerges
On a clear day at a certain location, a 100 V/m vertical electric field exists near the Earth's surface. Compute the energy density of the electric field
After the right string is cut, the meterstick swings down to where it is vertical for an instant before it swings back up in the other direction. What is the angular speed when the meterstick is vertical
A beam of light shoots from air into a piece of glass. If the refracted angle is half of the incident angle, what is the incident angle
A particle of charge q = e moves in a circle of radius = 0.52 m with speed v = 1.550×107 m/s. find the maximum torque exerted on the loop by a uniform magnetic field of magnitude B = 0.50 T
Then find the force between them as a function of distance h. describe why the sign of the force does (or does not) make sense to you.
If an object is moving with constant momentum ‹ 8, ?14, ?4 › kg · m/s, What is the net force acting on the object
What would be the minimum width of the mirror if you are willing to accept that you must use two eyes to see the full width of your face
you're helping with an experiment in which a vertical cylinder will rotate about its axis by a very small angle. you need to devise a way to measure this angle. you decide to use what is called an optical lever. How many degrees has the cylinder ro..
A camera is supplied with two interchangeable lenses, whose focal lengths are 42.0 and 180.0 mm. What is the height (including sign) of her image on the image sensor
The projection lens in a certain slide projector is a single thin lens. A slide 23.6 mm high is to be projected so that its image fills a screen 1.87 m high. Determine the focal length of the projection lens
What is the smallest distance between the speakers for which the interference of the sound waves is destructive
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