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A child slides down a snowcovered slope that makes an angle of 20 degrees with thehorizontal. If the coefficient of kinetic friction is .085, what is the child's acceleration? At what angle would the child slidewith constant speed?
A spring-loaded pellet gun is designed to fire 2.50 g projectiles horizontally at a speed of 50.7 m/s. What maximum force is required to load the gun
An object thrown straight up falls back and is caught at the sameplace it is launched from. Its time of flight is T;its maximum height is H. Neglect air resistance. What is its average velocity for the second half of the trip?
A golfer tees off on level ground, giving the ball an initial speed of 38.5 m/s and an initial direction of 36.0° above the horizontal. (a) How far from the golfer does the ball land? (Neglect air resistance.)
A swing is made from a rope that will tolerate a maximum tension of 1.0 * 10^3 N without breaking. What is the mass of the heaviest person who can ride the swing
q. a motorcycle is traveling up one side of a hill and down the other side. the crest of the hill is a circular arc
A penny is in an external electric field of magnitude 1.7 kN/C directed perpendicular to its faces. Find the charge density on each face of the penny
A 1 kg stone is thrown upward from a 20 m building with a vertical velocity of 15 m/s. Compute The velocity at impact with the ground
The recovery time of a hot water heater is the time required to heat all the water in the unit to the desired temperature. determine the recovery time (in hours) of the unit
A 100-W lightbulb has a resistance of about 12 ?when cold (20 ?C) and 156? when on (hot). Estimate the temperature of the filament
The electrons in the beam of a television tube have a kinetic energy of 3.26 × 10-15 J. What is the acceleration of an electron due to this field component
An alpha particle (the nucleus of helium nucleus with charge+2e and mass 4.0u (1 u = 1.66E-27) moves in a circular orbit ofradius R=12 cm in a uniform magnetic field of 0.25 T, where the magnetic field is perpendicular to the orbit plane.
An astronomical telescope is designed with an overall magnification of 80x. The objective has a focal length of 98.0 cm. What should be the focal length of the eyepiece
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