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1) A man stands on a frictionless platform that is rotating with an angular speed of 3.3 rad/s; his arms are outstretched and he holds a weight in each hand. With his hands in this position the rotational inertial of the system of man, weights, and platform is 4.3 kg*m2. If by moving the weights the man decreases the rotational inertial of the system to 1.8 kg*m2, what is the resulting angular speed of the platform?
2) What is the change of the kinetic energy when the man moves his arms?
A radio station broadcasts at a frequency of 92.0 MHz with a power output of 51.8 kW. what is the energy of each emitted photon
A sphere consists of a solid wooden ball of uniform density 800 and radius 0.20 and is covered with a thin coating of lead foil with area density 20.
What minimum force is necessary to start the block moving up the wall? (Hint: The static frictional force is now directed down the wall.)
q1. a mass-spring system oscillates on a horizontal frictionless surface with amplitude of 3.89 cm. if the spring
The catapults on the USS George H.W. Bush can launch aircraft from rest to a speed of 150 mph over a distance of 270 feet. Find the acceleration of the aircraft
A sound wave with intensity 4 mW/m2 interferes destructively with a sound wave that has an intensity of 13 mW/m2
A gas undergoes two processes. In the first, the volume remains constant at 0.200 m3 and the pressure increases from 2.00 105 Pa to 5.10 105 Pa. Find the total work done by the gas during both processes
Use the binomial expansion to find an approximate expression
The bottom of a swimming pool looks to be 1.5 m below the surface. Find the pool's actual depth
Sketch a graph of maximum kinetic energy, KE max against visible light frequency, v for this experiment Label threshold frequency Vc.
Suppose you are planning a trip in which a spacecraft is to travel at a constant velocity for exactly ten months, how fast must you travel
A thin 12 cm long solenoid has a total of 490 turns of wire and carries a current of 1.9 A. find the magnitude of the field inside near the center.
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