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An object initially has kinetic energy K. The object then moves in the opposite direction with 13 times its initial speed. What is the kinetic energy now (in terms of the initial kinetic energy K)?
question a 4.2 kg rectangular air mattress is 2.7 m long 0.653 m wide and 0.167 m thick. what mass can it support in
A 4.90-kg ball, moving to the right at a velocity of +2.14 m/s on a frictionless table, Find the magnitude and direction of the final velocity of the two balls if the collision is completely inelastic
A force of 1250N is needed to move a crateweighing 3270N up a ramp that is 4.55m long. if the elevated end ofthe ramo is 0.750m high, what is the efficiency of theramp?
Most of the asteroids orbit the Sun in a belt between Mars and Jupiter. how long does the average asteroid take to orbit the Sun
The coefficient of static friction between the 3000 lb car's tires and the road is 0.5. Determine the steepest grade the car can drive up at constant speed if car has (a) rear=wheel drive; (b) front-wheel drive; (c) four wheel drive.
A charge of +8.8 micro-coulombs with a mass of 0.56 kg lies on a horizontal surface. What is the amount of the normal force on the charge
The earth orbits the sun once a year (3.16 x 10^7 s) in a nearlycircular orbit of radius 1.50 x 10^11 m. With respect to the sun,determine the magnitude of the earth’s centripetal acceleration.
Chromium is produced by reacting its oxide with aluminium. If 354 g of Cr2O3 and 158 g of Al react to form 204 g of Al2O3, how many grams of Cr are formed.
A point charge of 8.40 mC is surrounded by an equipotential surface with a radius of 0.262 m. What is the electric potential on the surface
A 1550 kg car drives around a flat 200 m diameter circular track at 30 m/s. What is the magnitude and direction of the net force on the car
In a collision between a car of mass 1000 kg and a pickup truck of mass 1600 kg, the truck is initially at rest and the car is moving with a velocity 21 m/s. Immediately after the collision, the car is moving with a velocity 2.0 m/s in the same di..
King Arthur's knights use a catapult to launch a rock from their vantage point on top of the castle wall, 12m above the moat. How far from the castle wall does the launched roch hit the ground
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