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1. Your nephew swings a rock around his head on a massless string. If the string is 1.5 m long and is 12?degrees from the vertical, what is the period of the rock?
2. A van drives at a steady speed in a circle. Inside the van, your nephew has hung a rock from a massless string attached to the ceiling of the van. Explain why the string hangs at an angle, and work out a formula for this angle.
A positron is an antimatter particle identical in mass to an electron but with a positive charge, Calculate the energies of the three lowest states of positronium
A gas in an engine undergoes a reversible cycle in which 152 Joules of work are done and 419 Joules of heat are supplied by the fuel. what would the high temperature be
A mass of 0.25 kg is attached to a horizontal spring with a spring constant of 4.0 N/m. Write an expression for the position of the mass as a function of time
A scaffold of mass 60 kg and length 5.5 m is supported in a horizontal position by a vertical cable at each end. find the tension in the cable closer to the painter
0.75mol of argon gas is admitted to an evacuated 70cm3 container at 40 degrees C. estimate the final pressure of the gas
A skier (m=63.0 kg) starts sliding down from the top of a ski jump with negligible friction and takes off horizontally. If h = 6.10 m and D = 12.2 m, find H.
A steel wire strung between two supports is initially horizontal when there is no tension on it. When a 9.5 kg painting is hung on the wire, the wire makes a 25° angle to the horizontal, as shown. Illustrate what is the diameter of the wire?
suppose the memebers of an orchestra are tuning up their instruments, whats's the speed of the wave along the violin string
A 1000 kg aircraft going 25 m/s collides with a 1500 kg aircraft that is parked and they stick together after the collision and are going 10 m/s after the collision
The largest fusion bomb ever detonated (called the Tsar Bomba) was tested by the Soviet Union in 1961. If this bomb used the deuterium-deuterium fusion reaction, how many kilograms of deuterium were required
A rectangular barge, 4.0 m long and 1.5 m wide, floats in fresh water. (a) Find out how much deeper it floats when its load is a 380-kg horse. (b) If the barge can only be pushed 15 cm deeper into the water before water overflows to sink it, how m..
Electrons are accelerated through a voltage difference of 145 kV inside a high voltage accelerator tube. What is the final kinetic energy of the electrons
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