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A 38.0-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 426 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 person who weighs 620 N stands at x = 5m, right on the end of a long horizontal diving board that weighs 350 N. The diving board is held up by two supports, one at its left end at x = 0, and one at the point x = 2.00 m.
A compact car has a mass of 1170kg. What will be the car's oscillation frequency while carrying four 84.0kg passengers
A Mercedes-Benz 300SL (m = 1750 kg) is parked on a road that rises 10° above the horizontal, What is the static frictional force that the ground exerts on the tires
An electric current of 200 mA is maintained for 3 sec in a 20-ohm resistor. The temperature of the resistor remains constant at 25 C. What is the change in the entropy of the resistor?
Tarzan spies a 40kg chimpanzee in severe danger, so he swings to the rescue. He adjusts his strong, but very light, vine so that he will first come to rest 4.4s after beginning his swing,
An electron moves in a circular path perpendicular to a magnetic field of magnitude 0.225 T, find the radius of the circular path
A 45.7-g golf ball is driven from the tee with an initial speed of 50.1 m/s and rises to a height of 23.3 m. determine the kinetic energy of the ball at its highest point
A single-turn rectangular coil with a width of 0.3m and a height of 0.2m is in the yz plane. Find the change in flux across the rectangular loop
You are shining ultraviolet light on a gas of an unknown element. You know that an electron starts in a ground state with an energy of -17.30 eV. What is the energy of the first photon emitted
a gas at p=40kpa and T= 310K hass a mass density of 8.44*10^-2kg/m3, what is the rms speed of the atoms in the gas
What is the distance Delta y_max-min between the second maximum of laser 1 and the third minimum of laser 2, on the same side of central maximum.
For a particular scientific experiment, it is important to be completely isolated from any magnetic field, including the earth's field. What is the current in the current loop
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