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A 41.0-kg child swings in a swing supported by two chains, each 3.08 m long. The tension in each chain at the lowest point is 346 N.
(a) Find the child's speed at the lowest point.
________________m/s
(b) Find the force exerted by the seat on the child at the lowest point. (Ignore the mass of the seat.)
_________________N (upward)
Two slits separated by 0.0530 mm and located 1.60 m from a viewing screen are illuminated with monochromatic light. Find the separation between adjacent bright fringes
A microwave oven is powered by an electron tube called a magnetron, which generates electromagnetic waves of frequency 3.46 GHz. determine the speed of the microwaves
Some European trucks run on energy stored in a rotating flywheel, with an electric motor getting the flywheel up to its top speed of 110 π rad/s. What is the kinetic energy of the flywheel after charging
A 2 kg book is lying on a 0.75 m high table. You pick it up and place it on a bookshelf 2.25 m above the floor. How much work does your hand do on the book
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An object with a height of 4.0 cm is placed 30.0 cm from a lens. The resulting inverted image has a height of 1.5 cm. What is the focal length of the lens
The emissivity of tungsten is 0.350. A tungsten sphere with a radius of 1.19 is suspended within a large evacuated enclosure whose walls are at a temperature of 285.0 . What power input is needed to maintain the sphere at a temperature of 2500.0 i..
A traffic light weighing 120 N hangs from a cable tied to two other cables fastened to a support. Find the tension in each of the three cables
You may have noticed a type of track lighting in museums or stores with modern decor called "cable track lighting." Bare power supply wires, What is the force between the long wires
Two blocks of masses m1=1 kg and m2 =2 kg are connected by a massless cord passing over a massless, frictionless pulley. what are the accelerations of the two masses with respect to the ground
A 1.0-kg ball has a velocity of 12 m/s downward just before it strikes the ground and bounces up with a velocity of 12 m/s upward. What is the change in momentum of the ball
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