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During liftoff, a hot-air balloon accelerates upward at a rate of 3.4 . The balloonist drops an object over the side of the gondola when the speed is 17 . What is the magnitude of the object's acceleration after it is released (relative to the ground)? How long does it take to hit the ground? Express your answer using two significant figures.
A disk drive plugged into a 120V outlet operates on a voltage of 12V. Find the number of turns on the secondary coil
A ball is thrown straight up from the ground with speed v 0 . At the same instant, a second ball is dropped from rest from a height H , Find the time at which the two balls collide
You are a professional frontier re-enactor who specializes in making lead shot. To do this you put 1.3 kg of ice into 1.3 kg of water, both at 0 C, into an insulated bucket.
how much work must be done to raise a 1100 kg car 1.5 m above the ground? what is the cars potntial energy afterward
A 60kg bicyclist rides his 7.8kg bicycle with a speed of 16m/s. How much work must be done by the brakes to bring the bike and rider to a stop.
Two steel juggling balls each carry a charge of 2.75 ?C. determine the distance between the centers of the two balls
A car is traveling 23 m/s when the driver sees a child standing in the road. He takes 0.8 s to react, then steps on the brakes and slows at 6.0 m/s2. Explain how far does the car go before it stops?
The 60kg cradle A is carrying the 12 kg pipe B at the speed of 8 m/s when it hits the rigid wall. suppose all the impacts are plastic, determine the speed of the pipe immediately after the impacts. Neglect friction.
In a supernova, a red giant of mass 1.19*1031 kg collapses into a neutron star of mass 5.97*1030 kg
A wooden raft has a mass of 45 kg. When empty it floats in water (density 1000 kg/m3) with 68% of its volume submerged. What mass of sand could be put on the raft without it sinking.
Just by the impact, the clay has speed v0 = 9 m/s, and the disk is rotating clockwise with angular speed w0 = 0.4 rad/s. Just following the impact, what is an angular speed of the combined system of wheel plus clay.
An ideal transformer has 255 loops in its primary coil and 125 loops in its secondary coil. what is the current in the secondary loop
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