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Q. A 2 kg ball of putty moving to the right has a head-on inelastic collision with a 1 kg putty ball moving to the left. If the combined blob doesn't move just after the collision, what can you close about the relative speeds of the balls before they collided?
Q. A roller coaster, travelling with an initial speed of 15 meters per second, decelerates uniformly at -7 meters per second per second to a full stop. How far does the roller coaster travel throughout its deceleration?
The stairs are 83 long and inclined at the angle of 31. If a player has a mass of 87, estimate his average power output on the way up. Overlook friction and air resistance.
A 115 granite cube slides down a 35 frictionless ramp. At the bottom, just as it exits onto a horizontal table, it collides with a 235 steel cube at rest.
A boy coasts down a hill on a sled, reaching a level surface at the bottom with the speed of 8.4 m/s. If the coefficient of friction between sled's runners and snow is 0.040.
The K-shell ionization energy of copper is 8979 eV. The L-shell ionization energy is 951 eV. Determine the wavelength of the Kα emission line of copper. What should be the minimum voltage be on an x-ray tube with a copper target in order to see the K..
Boxes are transported from one location to another in the ware-house by means of a conveyor belt that moves with a constant speed of 0.50m/s. At a certain location the conveyor belt moves for 2.00 m up an incline that makes an angle of 10° with the h..
A certain car battery with a 14.0 V emf has an initial charge of 195 A•h. Assuming that the potential across the terminals stays constant until the battery is completely discharged, for how long in hours can it deliver energy at the rate of 184 W.
A 69N box of clothes is pulled 8.9 m up a 30° ramp by a force of 100 N that points along the ramp. If the coefficient of kinetic friction between the box and ramp is 0.22, compute the change in the box's kinetic energy.
An infinite line of charge has linear charge density 5.50x 10-12 C/m. A proton (mass 1.67x 10-27 kg, charge +1.60 10-19 C) is 18.0 cm from line and moving directly toward the line at 1.20 x10^3 m/s. How close does the proton get to the line of char..
An athlete starts at point A and runs at a constant speed of 6m/s around a round track 100 m in diameter, what is x component of this runner's average velocity between points A and B.
If, instead, the gold is drawn out into a cylindrical fiber of radius 1.5µm, what is the length of fiber.
How far ahead of the film should the lens be if the object to be photographed is 13 m away.
A 60kg boy and a 45 kg girl use an elastic rope while engaged in a tug-of-war on a frictionless icy surface. If the acceleration of the girl toward the boy is 2.3 m/s2, find the magnitude of the acceleration of the boy toward the girl.
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