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A tennis ball traveling with velocity v=15m/s strikes a vertical wall and bounces back at v2=-20m/s. If the change in the kinetic energy of the ball is 8.7 J, find the change in momentum.
A system of 1219 particles, each of which is either an electron or a proton, has a net charge of -6.640×10-17 C. How many protons are in this system (exactly)
Sound with a frequency 730 Hz from a distant source passes through a doorway 1.05 m wide in a sound-absorbing wall. Find the number of the diffraction minima at listening positions along a line parallel to the wall
A permanent dipole is at rest at origin of a coordinate system with a random orientation. What is the equilibrium orientation of the dipole
A bicycle is turned upside down while its owner repairs a flat tire on the rear wheel. A friend spins the front wheel, of radius 0.386 m, and observes that drops of water fly off tangentially in an upward direction, find the magnitude of the averag..
A bat strikes 0.150 kg baseball. Just before impact, the ball is traveling horizontally to the right at 50.5 m/s , find the vertical component of the average force on the ball
A playground merry-go-round has a radius of 4.20m and a moment of Inertia 240 kgm^2 and turns with negligible friction about a vertical axis through its center. What is the average power supplied by the child
How many half-lives are required for the number of radioactive nuclei to decrease to 1/1010 of the initial number
The bugle and the Bach - Trumpet have no keys and thus play only the natural scale (open pipes). If the lowest note you can play on a bugle is D2 (73.42 Hz), what other notes can you play
A light bulb marked "100 W [at] 120 V" is screwed into a socket at one end of a long extension cord in which each of the two conductors has resistance of 0.600 Ω
A cyclist intends to cycle up a hill whose vertical height is 170m. Assuming the mass of bicycle plus cyclist is 75kg , calculate how much work must be done against gravity
A solid Cylinder with a mass of 10 kg is attached to an inclined plane.A 2kg block is attached to a string that is wrapped around the cylinder. Find the angular acceleration of the cylinder
A certain orthodontist uses a wire brace to align a patient's crooked tooth as in the figure below. The tension in the wire is adjusted to have a magnitude of 21.1 N. Find the magnitude of the net force exerted by the wire on the crooked tooth.
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