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A 2.9-kg cart is rolling along a frictionless, horizontal track towards a 1.0-kg cart that is held initially at rest. The carts are loaded with strong magnets that cause them to attract one another. Thus, the speed of each cart increases. At a certain instant before the carts collide, the first cart's velocity is +4.4 m/s, and the second cart's velocity is -1.7 m/s. (a) What is the total momentum of the system of the two carts at this instant? (b) What was the velocity of the first cart when the second cart was still at rest?
It has been found that, on average, galaxies are moving away from Earth at a speed that is proportional to their distance from Earth. What is the expected recessional speed of a galaxy 4.80 1022 m from Earth
At the upper atmosphere, the Earth receives approximately 1 KW/m^2 of energy from the sun. If the sun emits energy uniformly into space, what will be the sun's total mass loss
q1. a 73 trampoline artist jumps vertically upward from the top of a platform with a speed of 4.0. if the trampoline
A piano string is under a tension of T = 778N. When struck the wave has a period of t = 0.6ms and a wavelength of 0.77m. What is the linear density of the string
suppose that a particle accelerator is used to move two beams of particles in opposite directions. in a particular
A dockworker applies a constant horizontal force of 85.0 N to a block of ice on a smooth horizontal floor. The frictional force is negligible. What is the mass of the block of ice
When an ion accelerates through a potential difference of 2180V , its electric potential energy decreases by 1.40×10-15J What is the charge on the ion
A 7.50-nC charge is located 1.80m from a 4.20-nC charge, find the magnitude of the electrostatic force that one particle exerts on the other
Which of the following is NOT true about the movement of electrons in a simple circuit?
a steam power plant receives heat from a furnace at a rate of 280 gjh. heat losses to the surrounding air from the
The supersonic aircraft Concorde has a length of 63.0 m when sitting on the ground on a typical day when the temperature is 15.0 C . The Concorde is primarily made of aluminum. In flight at twice the speed of sound, friction with the air warms the Co..
A horizontal beam of electrons initially moving at 4.1 107 m/s is deflected vertically by the vertical electric field between oppositely charged parallel plates.
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