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the giant swing at the county fair consists of a vertical central shaft with a number of horizontal arms attached at its upper end. each arm supports a seat suspended from a cable d1=4.75 m long, the upper end of the cable being fastened to the arm at a point d2= 3.05 m from the central shaft.
find the time of one revolution of the swing if the cable supporting a seat makes an angle of theta = 30.5 degrees with the vertical.
A 100 kg running back is moving with a speed of 4.0m/s. What average force must be applied to stop him in 0.25 s
an ac power generator produces 60 a (rms) at 4000 v. the voltage is stepped up by an ideal transformer, what is the turn ratio of the transformer
The membrane that surrounds a certain type of living cell has a surface area of 4.4 x 10-9 m2, The potential on the outer surface of the membrane is +52.2 mV greater than that on the inside surface. How much charge resides on the outer surface
A 57-kg pole vaulter running at 1.1 m/s vaults over the bar. Her speed while she is above the bar is 1.0 m/s. Avoid air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.
A cubic metal box with sides of 18 cm contains air at a pressure of 1 atm and a temperature of 311 K. Find the force due to the internal air pressure on each wall
The temperature near the top of Saturn's cloud layer is about 110K. The temperature at the top of earth's troposphere, at an altitude of about 20km, is about 220K. Calculate the rms speed of hydrogen molecules in both these environments
Logan is given an initial speed of 4.00 m/s down a 20 %u030A incline. when he reaches the bottom of the incline
The atomic planes in a crysral are spaced d = 0.50 nm apart. These planes are used in a diffraction experiment with X-rays with ? = 0.05 nm. What are the diffraction angles for the first three bright fringes
A telephoto lens can focus on objects located between infinity and closer. To focus, How far away is the closest object that it can capture
A circular armature coil is used in a motor with a uniform magnetic field of 4.10 T. The coil has a diameter 60 cm, a resistance of 50 ?, how much current is flowing throught the motor
What is the smallest distance required to stop the plane
A car goes 13 miles east, then due North ending up 25 deg North of East from its initial position. How far due North did it travel
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