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A person on a swing moves so that the chain is horizontal at the turning points. Show that the centripetal acceleration of the person at the low point of the arc is exactly 2 g, regardless of the length of the chain. This means that the force on the chains at the low point is equal to three times the person's weight.(Hint: The vertical distance between the turning point and the low point equals the length of the chain.)
a parachutist with mass 86.0 kg jumps from an airplane traveling at a speed vi112 kmhr at a height h2570 m. he lands
A boy and girl are balanced on a massless seesaw. The boy has amass of 75kg and the girl has a mass of 50kg. If the boy sits 2metres from the pivot on one side of the seesaw where must the girlsit on the oppsite side.
two parrel,very long straight wires separated by 10 cm are carrying 2.0 A and 4.0 A in opposite direction. where the magnetic field is Zero
Calculate the necessary torque of a primary machine and the maximum rated power.- Calculate the distribution transformer ratings if the subtransmission voltage is 69 kV.
The motor of a ski boat generates an average power of 7.20 x 104 W when the boat is moving at a constant speed of 11 m/s. What is the tension in the tow rope
A photon of wavelength 0.72462 nm strikes a free electron that is at first at rest. The photon is scattered straight backward. What is the speed of the recoil electron after the collision?
conducting objects can be chrome-plated by immersing them in an electrolytic bath having positive chromium ions in
an object moving with uniform acceleration has a velocity of 10.0 cms in the positive x-direction when its x-coordinate
question a crate is sliding down an inclined plane. the coefficient of kinetic friction between the crate and the plane
A uniform rod of mass 4.2 kg and a length of 1.0 m is hinged to a wall at the left end and held in a horizontal position by a taut string. find the resulting angular acceleration of the rod
A potential difference is applied between the electrodes in a gas discharge tube. What is the current in the tube
Explain the difference between a fluorescence emission spectrum and a fluorescence excitation spectrum and Which more closely resembles an absorption spectrum? Why do some absorbing compounds fluoresce but others do not?
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