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A 20.0 kg floodlight in a park is supported at the end of a horizontal beam of negligible mass that is hinged to a pole. A cable at an angle of 30.0 degrees with the beam helps support the light. Find (A) the vertical component of the force exerted by the pole on the beam. (B) the horizontal component of the force exerted by the pole on the beam. (C) the tension in the cable. Compute these values by computing torques around the junction between the cable and the beam at the right hand of the beam. I know that this can be done using newtons laws (by drawing a force diagram) but how do I solve this with torque?
An ideal gas expands isothermally, performing 4.30×103J of work in the process. Calculate the heat absorbed during this expansion
An unknown nucleus has twice the volume of a nucleus with 62 nucleons. What is the atomic mass number of the unknown nucleus
Two identical diverging lenses are separated by 15 cm. The focal length of each lens is -8.0 cm. Determine the final image distance relative to the lens on the right
You are designing a diving bell to withstand the pressure of seawater at a depth of 220 m. What is the gauge pressure at this depth? (You can ignore changes in the density of the water with depth.)
A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 21.0 m/s. How long after being released does the stone strike the beach below the cliff
Suppose a proton accelerator is 3.99 m long and must accelerate protons from rest to a speed of 1.15 x 107 m/s. Ignore any relativistic effects and determine the magnitude of the average electric field
Find out the minimum sound intensity
Two hockey players strike a puck of mass 0.169 kg with their sticks simultaneously, exerting forces of 1.25 103 N, directed west, and 9.80 102 N, Find the instantaneous acceleration of the puck
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. find the tension in the tightrope
A 5-kg cart moving to the right ( ALONG POSITIVE X AXIS) with a speed of 6 m/s collides with a concrete wall and rebounds with a speed of 2 m/s
Two insulated wires, each 2.50 m long, are taped together to form a two-wire unit that is 2.50 m long. One wire carries a current of 7A; the other carries a smaller current I in the opposite direction. The two wire unit is placed at an angle of 78..
An automobile starter motor has an equivalent resistance of 0.0470 and is supplied by a 12.0 V battery with a 0.0120 internal resistance. What is the current to the motor
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