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To ensure a tight fit, cylindrical metal elements are sometimes made the same size (or even slightly larger) than the holes they will be placed into, and are cooled significantly just before being inserted into them. Suppose that on the UNR Zebra z-pinch, at 20 degrees Celsius, a cylindrical aluminum alloy cathode of diameter 7 cm needs to be cooled to fit into a hole in a holder. Suppose that the cathode needs to made 68 microns smaller (a micron, or micrometer, is 0.001 mm), in order to be inserted. To what temperature (in degrees Celsius) must the aluminum alloy cathode be cooled? The expansion coefficient of the aluminum alloy is 2.4E-5.
A 7 kg sled is initially at rest on a horizontal road. The sled is pulled a distance of 3.5 m by a force of 37 N applied to the sled at an angle of 30o to the horizontal
The magnetic force exerted on a 1.1-m segment of straight wire is 1.5 N. What is the angle between the wire and the magnetic field
How much farther from the tower does the cannonball from the higher cannon land than cannonball from the lower cannon.
In response to a stimulus, membrane can become permeable to Na ions. As Na ions rush into the cell, the interior of the cell reaches an electric potential of about 40 rm mV.
A neutron at rest decays into a proton and an electron. How much Kinetic energy (in MeV) are shared by the electron and proton? Can a proton decay into a neutron and positron?
A 2-kg book with no initial velocity slides down an inclined plane with an angle of 20 degrees a total of 2 meters. The force of friction does 10 Joules of work, what is the final kinetic energy of the system as the book reaches the bottom of the ..
Two astronauts of equal mass 70 kg are holding on to opposite ends of a straight rope in space. The length of the rope between them is 14 meters. What is the new angular velocity of the two astronauts
An object is launched with an initial velocity of 8.0 m/s to the horizontal from 327cm above the ground level. What is the final speed of the object
A certain atom has atomic number Z = 21 and atomic mass number A = 44. How many protons and neutrons are in the nucleus
A 3 kg block slides with a speed of 1.1 m/s on a frictionless horizontal surface until it encounters a spring. What initial speed should the block have to compress the spring by 1.2 cm
Two uniform, solid disks are rotating freely about the same axis. Then they are linked together without the aid of any external influences. Before being connected.
in a materials testing laboratory a metal wire made from a new alloy is found to break when a tensile force of 90.8 n
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