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a stel cable is used to keep a 2 m long 10 kg bar horizontal. one end of the bar is mounted to a wall. the other is connected to the cable, which makes a 30 degree angle with the bar. a 20 kg sign, 25 cm wide is then hung from the end of the bar. what tensional force now acts on the bar through the cable?
Unpolarized light travels throughout 2 linear polarizers. What (minimum) angle should the second polarizer be relative to the first polarizer (the difference between q1 and q2) so that the final intensity of light is 1/3 original value.
A spherical mirror has a focal length of -14 cm. Where is the mirror's image for an object which is at a distance of 30 cm? Draw the ray diagram for this set up
A scaffold of mass 44 kg and length 6.0 m is supported in a horizontal position by a vertical cable at each end. What is the tension in the cable closer to the painter
Write down the expression that shows the pressure
An object that hangs form the ceiling of a staionary elevator by an ideal spring scilliates with a period T. If the elevator accelerates upward 2g , what will the period of oscillation of the object ?
A potential difference of 13 V is found to produce a current of 0.45 A in a 2.7 m length of wire, Find the resistance and resistivity of the wire
A spring is initially compressed by 17.5 cm. If it takes 7.166 J of work to compress the spring an additional 3.5 cm, what is the spring constant of the spring
Determined to test the law of gravity for himself, a student walks off a skyscraper 180 m high, stopwatch in hand, and starts his free fall (zero initial velocity).
You work for a moving company and are given the job of moving two crates (masses are 130kg and 280kg) held together by a rope attached between the two. You pull on a rope attached to the larger crate giving the system the acceleration of 0.29m/s2. Wh..
A sign for the local cheese shop is hung by two strings of length 0.25 meters at either end from a 4 meter long pole with a mass of 200 kg. what is the coefficient of static friction between the wall and the pole
A "swing" ride at a carnival consists of chairs that are swung in a circle by 12.0 m cables attached to a vertical rotating pole, Find the speed of the chair
A square room has 3 mirrored walls of length L with one side missing. A laser is fired from the center of the open side of the room with an angle of incidence, I, what must the angle of incidence be
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