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An empty freight car of mass 8000 kg rolls at 5 m/sec along a level track and collides with a loaded car of mass 16,000 kg, standing at rest with its brakes released. If the cars couple together, find their speed after the collision. Also, find the decrease in kinetic energy as a result of the collision. Is the collision elastic or inelastic?
What is the resistance of a 1.7m -long copper wire that is 0.50mm in diameter? (Answer should be in ohms)
A beam of electrons is first accelerated (from rest) through a region of electric potential difference V=10 keV and then made to go through a slit of width a. What is the value of the momentum (px) of each electron
A cylinder of length L is resting at the base of a surface inclined at an angle alpha above the horizontal. The cylinder, with mass Mc and radius Rc, is free to rotate about an axis through its center. The coefficient of kinetic friction between t..
A cafeteria tray dispenser supports a stack of trays on a shelf hangs from four identical spiral springs under tension, one near each corner of the shelf. Each tray is rectangular, 45.3 cm by 35.6cm, 0.450 cm thick, and with mass 580g. Demonstrate..
Let's say that you have a mass of 45.0 kg, and that you run up a staircase as fast as you can, taking a time of 2.40 s to you raise yourself through a height of 3.00 meters. What is your power output during this process
A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 18.0 cm, Find the electric field just outside the paint layer
The ball rebounds straight upward to a height of 0.660 m. illustrate hat are the magnitude and direction of the impulse of the net force applied to the ball during the collision with the floor.
A horizontal rod 0.200 m long carries a current through a uniform horizontal magnetic field of magnitude 0.067 T that points perpendicular to the rod. what is the current flowing through the rod
a 55 kg swimmer is standing on a stationary 175 kg floating raft. the swimmer then runs off the raft horizontally with a velocity of + 3.7 m/s realtive to the shore. Find the recoil velocity that the raft would have
An individual is nearsighted; his near point is 16.0 cm and his far point is 47.0 cm. What lens power is needed to correct his nearsightedness
An aluminum plate has a length of 0.12 m and a width of 0.10 m at 25 °C. what is the change in the area of the plate as a result of the increase in temperature
A nichrome toaster wire, initially at room temperature, carries 2.72A immediately after it's turned on. What's the temperature of the nichrome then
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