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A wire of initial length L0 and radius r0 has a measured resistance of 2.0 . The wire is drawn under tensile stress to a new uniform radius of r = 0.45r0. What is the new resistance of the wire?
Calculate the amount of energy saved if all bulbs are replaced by CFL (spiral) bulbs (P=25W). Calculate the amount of natural gas (ft3) needed to provide the energy to keep the lights (long + regular) in the E391 lab
In the figure, two ideal solenoids link the circuit, with the solenoids' magnetic fields directed as shown. Use Kirchoff's rules to find the current in each resistor
When a large star becomes a supernova, its core may be compressed so tightly that it becomes a neutron star, what is the speed of a particle (in km/s) on the star's equator
A missile is shot straight up into the air. At the peak of its trajectory, it breaks up into three pieces of equal mass, What is the angle of the remaining piece
A long distance power line is to carry 175 megawatts (1.25x10^8W) of alternating current power at distance of 15.0km at a peak voltage of 1.00MV and a frequency of 60Hz.
What is the induced EMF when the south pole end of magnet moves closer to the plane of the coil? When the magnet is stationary what happens to the induced voltage
What is the minimum thickness of the film. what is the magnitude of the average acceleration of the ball through out this time interval.
A 0.420 kg ice puck, moving east with a speed of 3.12 m/s, has a head-on collision with a 0.890 kg puck initially at rest. Assuming a perfectly elastic collision, What is the speed of the heavier puck
A little cat, Bella, walks in a straight line, which we shall call the x axis, with positive direction to the right. As an observant scientist, you make measurements of her motion and construct a graph of the little feline's velocity as a function..
A 20.0-kg mass is supported by two strings. The left string is 2.00 m long and the right string is 5.00 m long. What is the tension in the left side string
The potential at the center of a uniformly charged ring is 52 kV, and 15 cm together the ring axis the potential is 41 kV. Find the ring's radius and its total charge.
In a nuclear experiment a proton with kinetic energy 1.5 MeV moves in a circular path in a uniform magnetic field. What energy (in MeV) must (a) an alpha particle (q = +2e, m = 4.0 u) and (b) a deuteron (q = +e, m = 2.0 u) have if they are to circ..
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