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A copper wire has a resistance of 0.455 Ω at 20.0°C, and an iron wire has a resistance of 0.492 Ω at the same temperature. At what temperature are their resistances equal? The temperature coefficient of resistivity for copper is 3.9010-3(°C)-1and for iron it is 5.0010-3(°C)-1.
The light from a red laser pointer has a wavelength of about 600nm. If this laser has a power of 0.27 mW, what is the momentum carried by a 3.1-s pulse of this radiation?
an aluminum nucleus has 13 protons and 14 neutrons. a copper nucleus has 29 protons and 34 neutrons. what is the force
A block of 3 kilogram is sitting at rest on an incline of 10 degrees. Use the impulse-momentum approach to calculate how long the block will continue to slide before it comes to stop on the incline
A merry go round in the park has a radius of 1.8 m and a rotational inertia of 900kg-m2.1. A child pushes the merry-go-round with a constant force of 80 n applied at the edge and parallel to the ege. A-frictional torque of 12 N-m acts at the axle of ..
An undersea research chamber is spherical with an external diameter of 3.70m. What is the buoyant force on the chamber
a truck covers 40.0 m in 9.20 s while smoothly slowing down to a final velocity of 2.60 ms.a find the trucks original
You are given a 12.0 V battery, and four resistors with the following values: 100.0, 30.0,20.0, 10.0. You also have plenty of wire that has essentially zero resistance.
A broken spaceship is located 10 km above the center of a large circular thin sheet of unknown dust. The sheet has a radius of 10^6km and a density of 7x10^11kg/m^2.
The tower of doom, at glitch gardens in Denver, Colorado, lifts 15 people 50m into the air. The engineers assume the average person has a mass of 70 kg. How much rider weight does the ride lift into the air? What is the potential energy of a single, ..
A spacecraft is in empty space. It carries on board a gyroscope with a moment of inertia of Ig = 24.0 kg · m2 about the axis of the gyroscope. The moment of inertia of the spacecraft around the same axis is Is = 5.00 105 kg· m2.
The walls of a blackbody cavity are at a temperature of 27o C. What is the frequency of the radiation of maximum intensity
A 10g pellet shot from a gun is moving horizontally with aspeed of 100m/s when it hits and stops in a 400g woodblock. What is the maximum compression of the spring
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