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In a test laboratory, an electric engine is used to accelerate a wheel from rest. The center-of-mass of the wheel remains stationary at all times. The wheel's angular acceleration is in the counter-clockwise direction. It rotates through an angular distance ??, achieves a final angular speed ? and has a constant moment of inertia I. If you assume constant angular acceleration and ignore friction and air resistance, what is the average power output of the engine, expressed in terms of ??, ? and/or I?
A parallel combination of a 1.11-?F capacitor and a 2.89-?F one is connected in series to a 4.65-?F capacitor. compute the charge of each capacitor
Approximately how many atoms make up our planet? For simplicity, suppose the average atomic mass of the atoms is 14 . Avogadro's number gives the number of atoms in a mole.
Two boats start together and race across a 56km wide lake and back. Boat A goes across at 56 km/h and returns at 56km/h. Boat B goes across at 28km/h, and its crew, realize how far behind it is getting.
suppose that E = 50.0V , R = 210? and L = 0.140H . With switch S2 open, switch S1 is left closed until a constant current is established. Which point is at a higher potential
You see lightning strike a mountaintop, and 2.98 s later you hear the accompanying thunder. How far away is the mountaintop
A 12-kg box is free from the top of an incline that is 5.00m long and makes an angle of 40 degrees to the horizontal. A 60-N friction force impedes the motion of the box.
If the coefficient of friction between the block and the floor is 0.40, what is the mass of the block.
Heather and Matthew walk eastward with the speed of 0.99 m/s east. If it takes them 37 minutes to walk to the store, how far have they walked? Reply in units of km.
A ball of mass 0.640 kg moving east (+x direction) with a speed of 3.50 m/s collides head-on with a 0.84 kg ball at rest. If the collision is perfectly elastic, what will be the speed and direction of each ball after the collision?
a supertanker with the mass of 3.34^7 kg is moving with a constant velocity .its engines generate a forword thurst of 5.38x10^5 n. determine the magnitude of the upward buoyant force exerted on the tanker by the water
The resultant displacement has a magnitude of 170 cm and is directed at an angle of 65.0° to the positive x axis. Find out the magnitude and direction of the second displacement.
define the potential difference between the plates.With what force must the player push the puck so that his force just equals the frictional force.
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