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Two circular disks spaced 0.50 mm apart form a parallel-plate capacitor. Transferring 1.50 ×109electrons from one disk to the other causes the electric field strength to be 2.90 ×105N/C. What are diameters of disks?
A 25 kg child on a 2.0 m swing is released from rest when the swing supports make the angle of 30.0 degrees with the vertical.
A 80 g, 37 cm long rod hangs vertically on a frictionless, horizontal axle passing by its center. A 15 g ball of clay traveling horizontally at 2.7 hits and sticks to the very bottom tip of rod.
What is the period of the motion.
The masses of the particles are m1 = m3 = 5.0 kg and m2 = m4 = 8.0 kg. Find out the moment of inertia of the system about the z axis.
The immediate environment of a reactor contains a large flux of 10 MeV gamma rays. Resolve the thickness of lead required to reduce the intensity by a factor of 1012. Assume the mass absorption coefficient of Pb for 10 MeV photons is m/r = 0.06 cm..
What is corresponding free energy change
A baseball (m = 155 g) approaches a bat horizontally at the speed of 40.5 m/s (91 mi/h) and is hit straight back at a speed of 45.5 m/s (102 mi/h).
A 12.0 kg box resting on the horizontal, frictionless surface is attached to a 5.00 kg weight by a thin, light wire that passes without slippage over the frictionless pulley. The pulley has the shape of the uniform solid disk of mass 2.10kg and diame..
A piece of balsa wood with density 0.50g/cm^3 is released under water. What is the initial acceleration?? Repeat for a piece of maple with density 0.760 g/cm^3? Repeat for a ping-pong ball with the average density of 0.127 g/cm^3.
The rotational inertia of a collapsing spinning star changes to 1/4 its initial value. What is the ratio of the new rotational kinetic energy to the initial rotational kinetic energy.
Racing drivers like to warm up the tyres of their car as soon as possible. One reason is that warm tyres grip the road better but the temperature also affects the pressure of the air into he tyres.
Then, calculate the exact number of protons and express the answer in scientific notation with the correct number of significant digits.
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