heat production

What is the amount of heat produced in 3 seconds by a circuit that has a voltage of 5 and the resistance is 10?

Electrons in a filament

How many electrons each second flow through the filament of a bulb with a resistance of 100 when this bulb is connected to a voltage source of 110V?

resistor of a wire

what happens to the resistor of a wire if the length of this wire is increased six times and its cross-sectional area is increased two times?

kematics

A hockey puck just clears the 2.00-m high boards on its way out of the rink. The base of the boards is 20.2 m from the point where the puck is launched. a. given the launch angle of the puck (-), outline a strategy that you can use to find its initial speed Vo. b. use your strategy to find Vo for (-) = 15.0 degrees.

circular velocity

You detect a star that appears to be moving in a circle wth a velocity of 20m/s and a period of 70 days. It is assumed this motion is due to the gravitational forve by a planet orbiting the star. The mass of the star is 2*10^30kg. Determine the mass of the planet and its orbital radius.