Electric Circuits Answers

Suppose the skateboarder shown in the drawing reaches a height of 2.20 m above the right side of the semicircular ramp. He then makes an incomplete midair turn and ends up sliding down the right side of the ramp on his back. When the skateboarder reaches the bottom of the ramp, his speed is 6.20 m/s. The skateboarder's mass is 53.0 kg, and the radius of the semicircular ramp is 2.60 m. What is the average frictional force exerted on the skateboarder by the ramp?

When a 10 ohm resistor is connected across the terminals of cell of EMF E and internal resistance r,a current of .10A flows through the resistor.If 10Ohm is replaced with 3ohm resistor the current increases to .24A. Find values of E and r.

the energy stored in a 12v battery is 3Mj. What is the charge transfer from one terminal to the other.

4 identical 1.5 volt cells were connected in series along with 3 ammeters,a lamp and a diode.The diode was forwardly biased.The lamp had a voltmeter connected across it which showed a reading of 2.6 V.The current in the circuit was 50 mA. A student expected the volmeter reading to be 6 V.The voltmeter was working correctly.Give 2 reasons why the reading on the voltmeter is less than 6.0 V.

normal modes of coupled oscillator .?if a coupled system had many modes,Do all the normal modes have the same frequency..??

An astronomical object has its mass 4 times the mass of earth and radius half of the radius of earth.If acceleration due to gravity at earth is g, find its value at the surface of the astronomical object.

An object is thrown horizontally from a height of 20 m with velocity 10m s-1.Find its velocity after 1 s(g=10m s-2)

A force does +180 J of work when it acts on a moving object and its direction is in the same direction as the object’s displacement. How much work does this force do when the angle between it and the object’s displacement is 56°?