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A 129-kg horizontal platform is a uniform disk of radius 1.57 m and can rotate about the vertical axis through its center. A 69.5-kg person stands on the platform at a distance of 1.01 m from the center and a 25.9-kg dog sits on the platform near the person, 1.39 m from the center. Find the moment of inertia of this system, consisting of the platform and its population, with respect to the axis.
When yellow light from a sodium lamp shines on a certain photocell, What potential would be needed to stop the electrons if light with 4000 A is used
A boat crosses a river with a width w=160m in which thecurrent has a uniform speed of 1.50m/s. What is the speed of the boat relative to a stationary shore observer
A highway is to be built between two towns, one of which lies 37.0 km south and 49.0 km west of the other. What is the shortest length of highway that can be built between the two towns
A particle is acted on by two torques about the origin: τ1 has magnitude 10 N m and pointsin the direction of increasing x, and τ2 has a magnitude of 12N m and points in the direction of decreasing y.
An archer shoots a 100 g arrow straight up in the air. The bow was drawn back 50 centimeter by a 150 Newton force. Find how high does the arrow rise assuming friction is negligible
a total of 3.02 x 106 electrons are placed on an initially uncharged wire of length 1.45 m.a what is the magnitude of
A sprinter runs 100.0 m. If he travels at constant acceleration of 1.95 m/s2 for the first 6.00 s, and then at constant velocity for the remaining time, What was his average speed
A machine gun fires 25-g bullets at the rate of 4 bullets per second. What is the average recoil force experienced by the machine gun
As the lander is descending, if the pilot decides to shut down the engine when the lander is at a height of 1.8 m, (this may not be a safe height to shut down the engine) and the velocity of the lander (relative to the surface of the planet) is 1...
A closed box is filled with dry ice at a temperature of -94.2 oC, while the outside temperature is 21.0 oC. Find the thermal conductivity of the material from which the box is made
A 1.09-µF capacitor is charged by a 31.0-V power supply. The fully charged capacitor is then discharged through a 9.8-mH inductor. Find the maximum current in the resulting oscillations.
Two speakers face each other and radiate coherently and in phase. The speakers are separated by a distance of 5.50 m, What is the wavelength of the sound
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