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A 23.0 {\rm kg} child plays on a swinghaving support ropes that are 2.20 {\rm m} long. A friend pulls herback until the ropes are 43.0^\circ from the vertical andreleases her from rest.
What is the potential energy for the child just as she is released,compared with the potential energy at the bottom of the swing?
How fast will she be moving at the bottom of the swing?
How much work does the tension in the ropes do as the child swingsfrom the initial position to the bottom?
A slug of mass 0.100 kg moving straight upward at 50.0 m/s collides with a 0.400 kg wooden block that is 20.0 cm long on a side, What is the loss of kinetic energy immediately before/after the hit
A vertical tube 1.9cm in diameter and open at the top contains 4.0g of oil (density 0.82 g/cm^3) floating on 4.0g of water. Find the gauge pressure at the oil-water interface
four identical charged particles q 11.0 microc are located on the corners of a rectangle as shown in the figure below.
A battery is connected in series with a R = 0.31 ? resistor and an inductor, as shown in the figure below. The switch is closed at t = 0. The time constant of the circuit is ? = 0.20 s, and the maximum current in the circuit is I = 7.9 A.
A helicopter stays aloft by pushing large quantities of air downward every second. What mass of air must be pushed downward at 40.0 m/s every second to keep a 1,000 kg helicopter aloft
a 1500 kg car drives around a flat 200 m diameter circular track at a constant speed of 25 ms. a what is the magnitude
A computer to be used in a satellite must be able to withstand accelerations of up to 23 times the acceleration due to gravity. What is the minimum amplitude of vibration that must be used in this test
A reactor contains a neutron source that produces 95,000 neutrons per second. The reactor has a keff of 0.991. Calculate the stable total neutron production rate in the reactor.
A -10.0 nC point charge and a +20.0 nC point charge are 15.0 cm apart on the x-axis. What is the direction of the electric field at the point on the x-axis, between the charges, where the electric potential is zero
An AC generator supplies an rms voltage of 230 V at 50.0 Hz. It is connected in series with a 0.600 H inductor, a 5.40 ?F capacitor and a 401 ? resistor. What is the peak voltage across the capacitor
a roller-coaster car has a mass of 1170 kg when fully loaded with passengers. as the car passes over the top of a
If the ball is free from rest at a height of 0.67 above the bottom of the track on the no-slip side, what is its angular speed when it is on the frictionless side of the track? Suppose the ball is a solid sphere of radius 2.2 and mass 0.14.
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