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A football of mass0.420 kg is thrown 60 m by a quarterback who imparts to it an initial velocity at an angle of 45 degrees above the horizontal. If the quarterback moves his hand along an approximately linear path of length 40 cm while accelerating the football, what force does his hand exert on the ball, assuming the force to be constant?
A long wire is known to have a radius greater than 5.2 mm and to carry a current that is uniformly distributed over its cross section, What is the radius (in mm) of the wire
A particle moves along the x axis unset the influence of a stationary object. The force exerted on the particle is given bu F=8x^3, where f is in newton's and x is in meters. if x=0 is taken to be the zero of potential energy, then the potential e..
A standard 100 W (120 V) lightbulb contains a 9.90cm -long tungsten filament. The high-temperature resistivity of tungsten, What is the diameter of the filament
Assume that the cell is floating on the surface of water, and that the water surface has a coefficient of friction of u=0.300. You now want to use a laser to move cell horizontally, along the surface of the water.
As part of a safety investigation, two 1900 cars traveling at 25 are crashed into different barriers. Find out the average forces exerted on (a) car that hits a line of water barrels and takes 1.8 to stop, and (b) car that hits a concrete barrier an..
A guitar string is 90.0 cm long and has a mass of 3.27g . From the bridge to the support post (=?) is 60.0 cm and the string is under a tension of 514 N
A cement block accidentally falls from rest from the ledge of a 74.8-m-high building. When the block is 18.4 m above the ground, a man, 2.10 m tall, looks up and notices that the block is directly above him. How much time, at most, does the man have ..
A ray of sunlight is passing from diamond into crown glass; the angle of incidence is 28.10°. Determine the angle between the refracted blue and red rays in the crown glass
If the skier is moving at 13 m/s at the bottom of the trail, calculate the total work done by friction and air resistance during the run
how long one electron to travel the full length of the cable.
State Newton's three laws of Motion and What is the difference between elastic collision and inelastic collision
A projectile is launched from a cannon at ground level at an angle of 62.0 degrees elevation and has a muzzle velocity of 481 m/s. Explain how many seconds after it is fired does it reach max height?
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