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A 6-kg bowling ball with a radius of 14 cm is spinning about a vertical axis (with its center of mass motionless) at an initial rate of 3 turns per second. Friction with the floor, however, causes the bowling ball to rotate more and more slowly until it stops after about 22s. What was the average torque that the friction interation applied to the bowling ball.
In the Bohr theory of the hydrogen atom, an electron moves with constant speed in a circular orbit about a proton, where the radius of the orbit is 0.53 x 10-10 m, Determine the electrostatic force exerted by the proton on the electron
An astronaut at rest on Earth has a heartbeat rate of 70 beats/min. What will this rate be when she is traveling in a spaceship at 0.90c as measured (a) by an observer also in the ship and (b) by an observer at rest on the Earth?
The concept of thermionic emission is the basis of modern X-ray tubes, which are the workhorse of a medical X-ray image. How many electrons, ne, has the filament lost
Four rays of light are incident on a surface of water. Their angles of incidence are 20, 30, 45, y 60 degrees. Calculate the angle of refraction for each ray
The earth orbits the sun once per year at the distance of 1.50 x 1011 m. How long (in earth days) does it take for Venus to make one orbit
a base for a building column measures 18.0 in. by 18.0 in. on a side and 12 in. high. compute the cross-sectional area
A source of electromagnetic waves radiates power uniformly in all directions at a single frequency. At a distance of 6.50 km from the source, What is the average power radiated by the source
When laser light of wavelength 632.8nm passes through a diffraction grating, the first bright spots occur at +/- 17.8 degrees from the central maximum. At what angles do the third bright spots occur
The frequency doubled output of a Nd3+ YAG laser has a wavelength of 532nm. If each pulse of light has a total energy of 0.550J and the repetition rate of the laser is 30Hz, how many photons does the laser emit at 532nm in 3 minutes.
A car driving directly north on the freeway at a speed of 110 km/h and a truck is leaving the freeway driving 85 km/h in a direction 35 west of north
A quarter circle of electric charge with a radius of 2.5 m has a uniform charge density of +0.7x10^-6 C/m. At the center of the circle is located a +0.3C charge
The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.53 m and 1.03 m, respectively. The respective rotational speeds are 449 rev/min and 4147 rev/min. Compute the speeds of the tips of both rotors.
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