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A block is at rest on an inclined plane whose elevation can be varied. The coefficient of static friction is ms= 0.42, and the coefficient of kinetic friction is mk = 0.15. The angle of elevation q is increased slowly from the horizontal. At what value of q does the block begin to slide (in degrees)? What is the acceleration of the block?
A thundercloud similar to the one described in Example 24.3 produces a lightning bolt that strikes a radio tower. find the effective resistance of the air during the lightning strike
Two identical spaceships are traveling in the same direction. An observer on Earth measures the first to have speed 0.80c, What is the speed of the second spaceship
the trummelbach waterfall in switzerland has a height of approximately 400 m. assuming that all of the available
A 1110 N man stands in the middle of a frozen pond of radius 4.18m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 0.645 kg physics textbook horizontall..
According to the shop manual, when drilling a 12.8-mm-diameter hole in wood, plastic, or aluminum, a drill should have a speed of 1400 rev/min. For a 12.8-mm-diameter drill bit turning at a constant 1400 rev/min , find the maximum linear speed of a..
A sinusoidal electromagnetic wave from a radio station passes perpendicularly through an open window that has area of 0.500m2. How much energy does this wave carry through the window
A magnetic dipole antenna is used to detect an electromagnetic wave. The antenna is a coil of 50 turns with radius 5.1 cm. The EM wave has frequency 870 kHz, electric field amplitude 0.56 V/m, and magnetic field amplitude 1.87 10-9 T.
A proton that has a mass m and is moving at 280 m/s in the + direction undergoes a head-on elastic collision with a stationary oxygen nucleus of mass 16m
A closely wound circular coil with a diameter of 4.00cm has 600 turns and carries a current of 0.500 A. What is the magnetic field at the center of the coil
The fastest pitched baseball was measured at 46 m/s, what force did he produce on the ball during this record-setting pitch
a thin metallic spherical shell of radius 42.1 cm has a total charge of 9.05 oc uniformly distributed on it. at the
Two toy cars resting on a frictionless table top are separated by a spring compressed by tying it with a thread. wht is the mass of the car moving to the left
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