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A positron is a particle with the same mass and magnitude charge as an electron, but a positron has a positive charge. If a positron and electron are held a distance of 0.900 pm apart and then both are released from rest, when they are 0.324 pm away from each other... (a) what is the system's total kinetic energy (i.e. what is the sum of the kinetic energies of both particles)? (b) how fast is the electron moving? m/s (c) how fast is the positron moving? m/s
A perfectly insulated system has work done by it at a rate of 13 W. At what rate is the internal energy of the system changing?
A brick of mass 1.05 kg is attached to a thin (massless) cable and whirled around in a circle in a vertical plane. The circle has a radius of 1.46 m. The cable will break if the tension exceeds 49.0 Newtons. What is the maximum speed the brick can ha..
A driver in a car travelling at a speed of 58.0 mi/h sees a deer 126 m away on the road. Calculate the minimum constant acceleration that is necessary for the car to stop without hitting the deer (assume that the deer does not move in the meantime).
On a cold night the temperatures of the two surfaces of a glass windowpane in a house are 7.8° C on the outer surface, Find the rate at which heat is conducted through the glass per square meter of window area
A certain cable car in San Francisco can stop in 10s while travelling at maximum speed. On one occasion, driver sees a dog a distance d m in front of the car and slams on the brakes instantly.
A 17.5 kilogram block is at rest on a frictionless incline that makes an angle of 25.0 degress with respect to the horizontal. What is the magnitude of the horizontal force
This time, William Tell is shooting at an apple that hangs on a tree . The apple is a horizontal distance of 20.0m away and at a height of 4.00m above the ground, what is the arrow's initial velocity
A 0.15 kg ball is placed in a shallow wedge with an opening angle of 150.For each contact point between the wedge and ball, find out the force exerted on the ball. Assume the system is frictionless.
A light string that does not stretch changes from horizontal to vertical as it passes over the edge of a table. The string connects m1, a 3.4 kg block, originally at rest on the horizontal table at a height 1.27m above the floor, to m2, a hanging ..
What is the total work W_fric completed on the block by the force of friction as the block moves a distance 8 rm m up the incline.
A volume of 2000 cm^3 of carbon dioxide gas at normal pressure and 20 C is compressed isothermally into a 2 cm^3 container, what is the final pressure inside the container
When Albert turns on his small desk lamp, the light falling on his book has intensity Io. When this is not quite enough he turns the small lamp off, What is the intensity of light falling on the book
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