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A student sits on a swivel seat. Initially the student is at rest, holding a spinning bicycle wheel that has an angular velocity of 12.6 rad/s (see figure below). The student turns the spinning wheel upside down, reversing the direction of its angular velocity. This causes the student to begin to rotate. Find the student's final angular velocity. The moments of inertia of the wheel and of the student are 0.345 kg · m2 and 2.41 kg · m2 respectively
a 60.0 n force is applied at an angle of 35 degrees to a 7.00 kg block pressed against a rough vertical wall, What is the coeffiant of kinetic friction in the vertical direction
A 5.29-kg ball hangs from the top of a vertical pole by a 2.09-m-long string. Calculate the angle, between 0° and 90°, that the string makes with the pole
A positron emission tomography (PET) scanner examines the gamma rays emitted when positrons and electrons annihilate each other. What is the wavelength of the photons
A 3.60 {rm m}-long, 430 {rm kg} steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 66 {rm kg} construction worker stands at the far end of the beam.
A uniform 2.95- kg spinning disk with a radius of 0.243 m is brought to rest by a brake-pad pressed against the side 0.165 m from the rotation axis. What frictional force was applied by the brake pad
The damage caused by electric shock depends on the current flowing through the body; 1 mA can be felt and 5 mA is painful. What is the minimum voltage placed across the arms that would produce a current that could be felt by a person with dry skin
What is the ratio of the amplitude
Puffy cumulus clouds, which are made of water droplets, occur at lower altitudes in the atmosphere. Find the altitude y (measured from sea level) above which wispy cirrus clouds can occur.
The mass of a discus is 2 kg. The average net torque exerted on the discus was 100 Nm, What was the angular impulse applied to the discus during the throw
Calculate the rest energy of an electron in joules and Calculate the rest energy of an electron in MeV (1MeV=1.60×10?13J)
You notice a group of children beside the ramp. One has a 2 kg rock tied to the end of a string that is 3 m long, What will happen if the string breaks? why?
Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest
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