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A major league pitcher of mass 100kg is standing on a skateboard of mass 2.00kg, holding a baseball. The skateboard is initially motionless. What is the speed of the skateboard after he throws a fastball? (Hint: A baseball has a mass of 150 grams. A major league fastball is 105 mph.)
Moving a charge from point A, where the potential is 380V, to point B, where the potential is 190 V, takes 4.1×10-4 J of work. What is the value of the charge
Protons are projected with an initial velocity v0 = 10360 m/s into a region where a uniform electric field E = 670 N/C is present. The protons are to hit a target that lies a horizontal distance of 1.27 mm from the point where protons are launched..
A 20.0-kg box rests on a horizontal surface. The coefficient of static and kinetic friction between the box and the surface are 0.30 and 0.10 respectively. what is the friction force between the box and the surface
A loop of wire in the shape of a rectangle of width 8 cm and length 90 cm and a long, straight wire carrying acurrent I= 5t^1.4-3t^1.8 downward lie on a tabletop; What is the direction of the induced current
A block of mass m=1.40kg slides along a horizontal table with speed Vo=2.50m/s. How far did the spring compress when the block first momentarily come to rest
A carbon resistor is made of a cylinder of carbon, of diameter 7.4 mm. what is the length of the cylinder
The coefficient of performance of a refrigerator is 3.4. The compressor uses 20 J of energy per cycle. How much heat energy is exhausted per cycle
What does halving the frequency of a wave do to the other properties of a wave, like speed, amplitude, wavelength, period, etc.) Describe what happens to the wavelength, frequency, and spped of a wave as it moves from glass to air.
A very massive object -almost innitely massive - moving with velocity v1 = 100m/s hits a very light object - "massless" - at rest. What is the final velocity of the very light object
You place 106 moles of hydrogen gas in a balloon of volume 2.4 m3, and find the pressure to be 1.3 times atmospheric pressure. What is the typical speed of a hydrogen molecule
A uniform density cube of mass m, side 2b, and center at C is placed on a fixed horizontal cylinder of radius r and center O in Earth's gravitational field. The cube is originally put so that C is centered above O, but it can roll from side to side w..
A copper pot with a mass of 0.485kg contains 0.175kg of water, and both are at a temperature of 20.0?C. Find the final temperature of the system
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