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A student on a piano stool rotates freely with an angular speed of 2.91 rev/s. The student holds a 1.45-kg mass in each outstretched arm, 0.791 m from the axis of rotation. The combined moment of inertia of the student and the stool, ignoring the two masses, is 5.50 kg m2, a value that remains constant. As the student pulls his arms inward, his angular speed increases to 3.47 rev/s.
a) How far are the masses from the axis of rotation at this time, considering the masses to be points?
b) Calculate the initial kinetic energy of the system.
c) Calculate the final kinetic energy of the system.
It is a damp, chilly day in a New England seacoast town suffering from a power failure. how much heat must flow into the water
A car moving at 10.0 m/s encounters a bump that has a circular cross-section with a radius of 30.0 m. What is the normal force exerted by the seat of the car on a 60.0-kg passenger
two stationary positive point charges charge 1 of magnitude 3.45 nc and charge 2 of magnitude 2.00 nc are separated by
suppose that the position vector fot a particle is given as a function of time by r(t) =x(t)i + y(t)j, with x(t) = at+b and y(t) = ct^2 + d, where a= 1.50m/s, b =1.25m, c= 0.123m/s^2, and d =1.02m
What is responsible for the rainbow-colored fringe commonly seen at the edges of a spot of white light from a slide or overhead projector?
How many transitions involving the hydrogen energy levels (solid lines) shown in the diagram correspond to photons of visible light? How many transitions involving the hydrogen energy levels shown correspond to photons of infrared light?
Why does the procedure of gently vibrating the force table allow the ring to discover its true equilibrium position (and thus indicate if the system is truly balanced)? Suppose that there is no problem with the ring getting hooked on the center post.
An electric dipole consists of 0.8 g spheres charged to 2.0 nC at the ends of a 8-cm-long mass less rod. What is the dipole's angular velocity at the instant it is aligned with the electric field
Two identical containers are adjacent to each other. They both have Volume =3.5 L and Pressure = 1atm. One contains O2, a diatomic gas, (molar mass 32g/mol) at initial temperature 250K. The other contains argon, a monoatomic gas, (molar mass 40g/mol)..
q1. a beam of 6 mev electrons passes through a 400 micro-meter thick silicon detector. estimate the energy lost by the
A storage tank contains 21.6 kg of nitrogen (N_2) at an absolute pressure of 3.54 atm. What will the pressure be if the nitrogen is replaced by an equal mass of CO_2 ?
A 1.7kg book is lying on a 0.80m -high table. You pick it up and place it on a bookshelf 2.3m above the floor. how much work does gravity do on the book
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