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Police lieutenants, examining the scene of an accident involvingtwo cars, measure the skid marks of one of the cars, which nearlycame to a stop before colliding, to be 76m long. The coefficient of kinetic friction between rubber and the pavement is about 0.60. Estimate the initial speed of that car assuming a level road.
a spacecraft engine creates 55.1 mn of thrust with a propellant velocity of 4.88 kms. a find the rate dmdt at which the
A balloon is filled with 4.75 liters of helium at a pressure of 1.05 atm and a temperature of 28.0° C. Find the acceleration of the balloon if the rubber has a mass of 4.00 g
A cat dozes on a stationary merry-go-round, at a radius of 6.0 m from the center of the ride. What is the least coefficient of static friction between the cat and the merry-go-round
A skater of mass 81.5 kg initially moves in a straight line at a speed of 4.70 m/s. what is the skater's final velocity
An electron is accelerated from rest through through a potential difference of 35,000 V. What is the electron's kinetic energy in Joules
A ball is shot from the ground into the air. At a height of 9.60 m, the velocity is observed to be v = (7.70 m/s) i + (7.00 m/s) j. What is the maximum height that the ball will rise
a light ray is incident upon a plane interface between two materials. the ray makes an incident angle with the normal
When a 58 g tennis ball is served it accelerates from rest to a constant speed of 42 m/s the impact with the racket gives the ball a constant acceleration over a distance of 37 cm illustrate what is the magnitude of the net force acting on the ball..
in conventional television signals are broadcast from towers to home receivers. even when a receiver is not in direct
A magnifying glass uses a converging lens with a focal length of 14.5 cm. It produces a virtual, How far is the object from the lens
A satellite of mass 310 kg is launched from a site on the Equator into a circular orbit at 8000 km above Earth's surface. DATA: Rearth=6.38×106 m. a) What is the acceleration of gravity at this altitude? b) What is the speed of the satellite? c) What..
A sprinter of mass 69.3 kg runs at a constant speed of 10.9 m/s in a straight line. Find the extra force the sprinter must exert on the ground
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