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The first car has twice the mass of a second car, but only half as much kinetic energy. When both cars increase their speed by 12m/s , they then have the same kinetic energy. What were the original speeds of the two cars?
A major motor company displays a die-cast model of its first automobile, made from 6.60 kg of iron. What mass of gold is needed to make the new model
The catapult on an aircraft carrier can take an aircraft from 0 to 83.1 m/s in 14.5 seconds, at which time the aircraft launches. What is the acceleration of the aircraft when it launches
A stone takes 0.28s to travel past a window 2.2m tall. From what height above top of the window did the stone fall?
A string 2.0m in length is fixed a both ends and tigthened until the wave speed is 78m/s. what is the frequency of the standing wave
A wire of radius 0.5 cm carries a current of 150 A that is uniformly distributed over its cross-sectional area. find the magnetic field at the surface of the wire
A 40g ball of clay traveling east at 2.0m/s collides and sticks together with a 60g ball of clay traveling north at 1.0m/s
One cubic meter of water flowing over Niagara Falls in New York drops 96.6 meters. how much heat energy would the water have
a transformer has N^1 =350 turns and N^2 =2000 turns. If the input voltage is 170V, what voltage is developed across the secondary coil?
The plate seperation of a parallel plate capacitor is 1 cm. The potential on the negatively charged plate of the capacitor is zero. find the strength of the electric field in the capacitor
What is the maximum height the rocket reaches. How long is the rocket in the air.
You are a space traveller and you land on the surface of a new planet. You decide to drill a tunnel through the center of the planet to the opposite side of the planet. How long will it take to make it to the other side of the planet
A box slides down a 36° ramp with an acceleration of 1.26 m/s2. find the coefficient of kinetic friction between the box and the ramp.
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