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.

force problem

Three blocks are configured as in the attachment. A string is attached from block #1 to block #2 (looped over a pulley), and the angle between the string going from mass #2 to the pulley, with respect to straight downward, is θ (block #2 is hanging there, not touching block #3). An external force F is pushing on block #3. ...continues

Test prep questions

These are questions to prep for a test tommorow. No answers were provided. Please help with question 3.

newtons law i need help with number 65 on the attached jpeg file

Find the frictional force exerted on Block A given that the mass of block A is 8.50kg, the mass of block b is 2.25 kg and the coefficient of static friction between block a and the the surface on which it rests is 0.320 (b) if the mass of block a is doubled does the frictional force exerted on it increase, decrease, or stay the ...continues

Acceleration,distance,and velocity

Car A accelerates from rest with 2m/sec^2 and Car B is moving with a constant velocity of 25 m/s. at the instant t=0. Determine (a) distance between the two cars at t=5 sec. (b) time for the cars to arrive at the same location. (c) distance of car A from the origin when they arrive at the same location. (d) speed of car A at ...continues

Pphysics word problem

A child sits on a rotating merry-go-round, 2.1 meters from its center. If the speed of the child is 1.0 m/s, what is the minimum coefficient of static friction between the child and the merry go round that will prevent the child from slipping.