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A 38.0-kg child swings in a swing supported by two chains, each 2.96 m long. The tension in each chain at the lowest point is 438 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)
A 1200 kg car is pulling a 500 kg triler along level ground. Friction is negligible. What is the magnitude of the force exerted by the car on the trailer
Two large equipotent surfaces are flat and parallel and separated by a relatively small distance compared to their size. One surface is at 25 V and the other is at 33 V. The surfaces are 1.25 cm apart. What is the direction of the electric field m..
You push with a horizontal force of 50.0N against a 24.0N box, pressing it against a rough wall to hold it in place. what is the friction force of the box
A visible disturbance propagates around a crowded soccer stadium when fans, section by section, jump up and then sit back down
A circular coil, with radius of 10 cm, and 25 turns, rotates in a constant magnetic field of strength 2.4 T, If the magnetic field that the coil is in points down the page, which direction does the coil rotate
What intensity level of the horn's sound is observed by somebody waiting at an intersection 58m from the train.
A boy tosses a ball in the vertical direction off the side of a cliff. if the initial velcoity of the ball is 15 m/s upward, determine the maximum height sb reached by the ball
A uniform electric field of 2000 N/C is in a direction 600 from the x-axis. A charge of -1.20 mC starts from the origin O, calculate the potential at B and at the origin
Body A in the figure weighs 122 N, and body B weighs 33.5 N. The coefficients of friction between A and the incline are, What is the acceleration of A if A is initially at rest
Coherent light from a sodium-vapor lamp is passed through a filter that blocks everything except for light of a single wavelength. find the wavelength of the light that falls on the slits
What is the minimum coefficient of friction between tires and road that will allow cars to take turn without sliding off the road.
a Hollow sphere of mass M=1000kg and radius R=25cm is rolling down of an incline plans making an angle with horizontal. calculate the angular acceleration of hollow sphere
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