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A 21.0 kg child on a 1.00 m long swing is released from rest when theropes of the swing make an angle of 33.0° with thevertical.
a) Neglecting friction, find the child's speedat the lowest position.b) If the speed of the child at the lowest position is1.60 m/s, what is the mechanical energy lost due to friction?
A professor's office door is 0.95 wide, 2.2 high, 4 thick; has a mass of 22 , and pivots on frictionless hinges. A "door closer" is attached to door and the top of door frame. When the door is open and at rest, the door closer exerts a torque of 5..
A current of 1.00 Amperes is maintained in a simple circuit with a total resistance of 3.00 ohms. How much heat is generated in 4.00 s
question1a parachutist relies on air resistance mainly on her parachute to reduce her downward velocity. she and her
A 1.53 kg ball is attached to a ceiling by a 3.06 m longstring. The height of the room is 5.12 m. Theacceleration of gravity is 9.8 m/s2. What is the gravitational potential energy associated with theball relative to the ceiling? What is the gravita..
A car drives straight off the edge of a cliff that is 58 m high. The police at scene of the accident observed that the point of impact is 121m from the base of cliff. How fast was the car traveling when it went over the cliff.
A load of bricks is being lifted by a crane at the steady velocity of Vo (= 5 m/s) when one brick falls of H (= 5m) above the ground. What is the greatest height above the ground that the brick reaches
A cooking vessel on a slow burner contains 11.2 kg of water and an unknown mass of ice in equilibrium at 0°C at time t = 0. The temperature of the mixture is measured at various times, and the result is plotted. During the first 50.0 min, the mixt..
You exert a force as shown in the diagram to push a large crate of books (about 1 m high, m = 45.0 kg) across a rough floor at constant speed v = 0.650 m/s. Find the rate at which work is done by you
The magnetic field at the center of a 0.900-cm-diameter loop is 2.70mT . A. What is the current in the loop? B. A long straight wire carries the same current you found in part a. At what distance from the wire is the magnetic field 2.70mT ?
A power plant produces 1064.8 MWt. If 771.5 MWt is rejected to the environment, what is the thermal efficiency of the plant
An alpha particle travels at a velocity of magnitude 420 m/s through a uniform magnetic field of magnitude 0.061 T. compute the magnitude of the acceleration of the particle
A skier is gliding along at 3.0 m/s on horizontal, frictionless snow. He suddenly starts down a 13 degree incline. His speed at the bottom is 13 m/s. What is the length of the incline
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