Description of motion of a test particle in the non-null electromagnetic field.

General Theory of Relativity. Description of motion of a test particle in the non-null electromagnetic field.

Semiconductor Light Detectors

A p-n photodiode acts as a photocell, the circuit is shown in this document. Outline the band profile of the diode for infinitely large RL for different levels of illumination.

Power

A.) A car with a mass of 1.50 x 10^3kg starts from rest and accelerates to a speed of 18.0 m/s in 12.0s. Assume that the force of resistance remains constant at 400.0 N during this time. What is the average power developed by the car's engine? B.) How long does it take a 19kW steam engine to do 6.8 x 10^7 J of work? C.) A motor-driven winch pulls the student in item 2 5.00m up the rope at a constant speed of 1.25m/s. How much power does the motor use in raising the student? How much work does the motor do on the student? Please show the answers, formulas used and work. Thanks you!

Power output and work

A 50.0 kg student climbs 5.00 m up a rope at a constant speed. If the student's power output is 200.0 W, how long does it take the student to climb the rope? How much work does the student do? Please answer the question, show the formula used and the work. Thank you!

Rotational equilibrium

I am trying to help my brother (in high school) understand how to solve rotational equilibrium problems. What he needs is a explanation on how to approach these problems. I understand each problem is different, but I imagine there must be a general method for solving them. I have put a problem below so that hopefully you could apply the explanation/method to an example to clarify things. Thank you. Problem: 1)A uniform bridge 20.0 m long and weighing 4.00x10^5 N is supported by two pillars located 3.00 m from each end. If a 1.96x10^4 N car is parked 8.00 m from one end of the bridge, how much force does each pillar exert?