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A large turntable rotates about a fixed vertical axis, making one revolution in 7.00 s . The moment of inertia of the turntable about this axis is 1300 kg·m2. A child of mass 40.0 kg , initially standing at the center of the turntable, runs out along a radius. What is the angular speed of the turntable when the child is 2.50 m from the center, assuming that you can treat the child as a particle?
A person is standing on a level floor. His head, upper torso, arms, and hands together weigh 401 N and have a center of gravity that is 1.39 m above the floor. find the location of the center of gravity for the entire body
Calculate the energy, in MeV, released in this reaction. (4.032 MeV) The abundance of deuterium relative to ordinary hydrogen is 0.016%. This means that in one kg of water, there is 0.0089 mol (or 0.0178 gram) of deuterium. Calculate the energy av..
The rocket speeds up until the fuel is gone, then air resistance causes the rocket to slow back down. Find the times when the rocket is travelling at half of its maximum velocity. Note that there are two such times, one when the rocket is speeding..
What are the first, second, and third frequencies audible from a 20cm long organ pipe when (1) only one end is open and when (2) both ends are open. The speed of sound through the air inside the organ pipe is 343 m/s. (Hint: if a harmonic does not..
Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 13 m/s at an angle 54 degrees
A compound microscope has a barrel whose length is 19.7 cm and an eyepiece whose focal length is 1.7 cm. What focal length must the objective have so the angular magnification of the microscope is -330
A microwave oven with microwaves 12.2 cm long has a power output of 760 Watts. Find the number of photons emitted per second
What is the direction of the net force on q3? where along the x axis can q3 be placed and the net force on the zero, other than the trivial answers of x= +infinity and x= -infinity.
A satellite of mass 6000 kg orbits the Earth in a circular orbit of radius of 9.0*10^6 m (this is above the Earth's atmosphere). Using the momentum principle, find the speed of the satellite in orbit
A very long, straight cylindrical conductor with radius R and length L carries a uniformly distributed net charge Q. What are the bound surface charge densities at r = 2R and at r = 4R
A Martian leaves Mars in a spaceship that is heading to Venus. On the way, the spaceship passes earth by a speed v = 0.86c relative to it. Suppose that the three planets do not move relative to each other through the trip. The distance among Mars and..
At a county fair, two children ram each other head-on while riding on the bumper cars. Jill and her car, traveling left at 3.20m/s, determine the speed of Jill and her car after the collision
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