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A softball pitcher can exert a force of F = 80 Newton on a softball. If the mass of the ball is 0.19 kilogram and the pitcher has it in her hand over a distance of d = 1.2 meter, obtain the speed of the ball when it leaves her hand?
Every year, there is a foot race to the top of the Empire State Building. The vertical distance traveled (using the stairs!) is about 440 m. what was his average power output during the race
you want the current amplitude through a inductor with an inductance of 4.10mh part of the circuitry for a radio
There is a curling disc of mass m =20dkg at rest on the ice.Another disc of the same kind collides head-on (b=0) into it at aspeed of v =20m/s. what is the speed of the two discs after the collision
The capacitance of a capacitor depends on
A 16.0-m uniform ladder weighing 480 N rests against a frictionless wall. Find the horizontal and vertical forces the ground exerts on the base of the ladder when an 820-N firefighter has climbed 3.90 m along the ladder from the bottom
A cat walks 8.0 m north, 5.0 m east and then 6.0 m south. What is the magnitude of the cats displacement from the starting point
A particle moves along the x axis. It is initially at the position 0.180 m, moving with velocity 0.210 m/s and acceleration -0.210 m/s2. Suppose it moves with constant acceleration for 4.50 s.
two submarines are underwater and approaching each other head-on. sub a has a speed of 18 ms and sub b has a speed of
A laser used in eye surgery emits a 3.08 mJ pulse in 1.04 ns, focused to a spot 32.4 um in diameter on the retina. Calculate (in SI units) the power per unit area at the retina
Two protons are located on the x-axis at 1.0m and on the y-axis at 1.5m. Determine the electric potential energy of a third proton located at the origin
An electron is accelerated from rest through a uniform electric field of 4000 V/m. How much is the change of potential energy of this electron
a large fake cookie sliding on a horizontal surface is attached to one end of a horizontal spring with spring constant
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