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You try to pound a nail into a piece of wood by holding the piece of wood in your hand. It is hard, so then you get a heavy piece of iron and put the wood on top of that. You hold the iron and start pounding. Why is it easier now to get the nail into the wood?
Your friend is not wearing a seat belt and slams into the windshield when you abruptly stop. Why?
A 1 kg water bottle is thrown up. Ignoring friction what is the net force on the water bottle in Newtons?
The magnetic force isalways perpendicular to both the magnetic field and the velocity ofthe charge. Magnetic fields don't doany work on charges. Magnetic fields arecreated by moving charges. Magnetic fields deflectmoving charges.
Aspace traveller has landed on the sruface of an unknown planet. He drops a small lead all from the top of his space ship and finds that is takes 3 seconds to reach the ground, 18m below. if the weight of the astronaut is 710N on earth, how much will..
A 100-g ball collides elastically with a 300-g ball that is at rest. what are the velocities of the two balls after the collision
A 75.0 kg stunt man jumps from a balcony and falls 24.0 mbefore colliding with a pile of mattresses. what is the averageforce exerted by the mattresses on thestuntman
A girl of m1=60 kg springs from a trampoline with an initial upward velocity of Vi=8.0 m/s. what is the speed of the girl immediately before she grabs the box
In a 45° - 90° - 45° prism with a ray of light entering and exiting on the long side of the prism after undergoing two total internal reflections. Determine the minimum index of refraction of the prism in order for this to occur
A 5-kg fish swimming 1 m/s swallows an absentminded 1-kg fish swimming toward it at a speed that brings both fish to a halt immediately after lunch. What was the speed of the smaller fish
A 2Kg wood block is attached to a .3 g bucket by a massless string rests on the durface of and inclined plan of 20 degrees. the coefficient of friction between the block and the inclined plane are static friction is equal to .4 and kinetic frictio..
consider a uranium nucleus to be a sphere of radius r 7.4 x 10-15 m with a charge of 92e distributed uniformly
an undiscovered planet many light-years from earth has one moon which has a nearly circular periodic orbit. if the
A 1.25 meter long wire has a mass of 150 grams. The wire is stretched with a force of 2 Newtons. What is the velocity of a wave over the wire
A series circuit has a 50-Hz AC source, a 60-ohm resistor, a 0.50-H inductor, and a 10 uF capacitor. The RMS current in the circuit is 2.2 A. Find the power factor of the circuit
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