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Question: (a) If copper has a resistivity of 1.69 x 10^-8 ohm, what is the resistance of a long copper wire of length 1 meter with a circular cross section radius of 1.0 mm? (the area of a circle r^2.)
(b) If the wire is stretched so that its volume remains the same, but the length is doubled, what is the resistance now? (Hint: rember volume = area x length, so if length doubles volume remains unchanged, what happens to the area?
Suppose the 16.59W of radiation emitted in a microwave oven is absorbed by a very lightweight cup holding 136.46g of water. Approximately how long will it take to heat the water from 43.83oC to 76.36 oC?
Water at ground level is moving at a speed of 1.20 m/sec in a pipe at a pressure of 850 kPa. What is the pressure of the water on the fourth floor
Explain how to determine the total resistance of a parallel and a series circuit. How does total resistance affect the current in each type of circuit
Protons can escape from the surface of the sun if their kinetic energy is sufficient to overcome the gravitational potential energy. a) Calculate the minimum speed necessary for escape
A small block with mass 1 kg slides in a vertical circle of radius 0.5 m on the inside of a circular track. how much work is done by the friction force on the block
How far is the center of mass of the Earth-Moon system from the center of Earth? (Mass of Earth is 5.98 × 1024 kg
A constant force of 45 N directed at angle ? to the horizontal pulls a crate of weight 100 N from one end of a room to another a distance of 4 m. Given that the vertical component of the pulling force is 12 N, calculate the work done by the force in ..
Communication satellites are placed in geosynchronous orbit, i.e., in circular orbit such that they complete one full revolution about the earth in one sidereal day.
The planet Mercury has a mass that is 5.00% of that of Earth, and its gravitational acceleration is gmercury = 3.70 m/s2.From what height would you have to drop the rock on Earth so that the fall-time on both planets is the same?
In nuclear power plant, the reactor produces steam at 518 celcius and the cooling tower eliminates waste heat into the atmosphere at 27 celcius. what is the rate of release of waste heat
If the winner's ball landed a distance 3.65 m from the table edge, calculate his break shot speed. Also need to know at what speed did his pool ball hit the ground.
A luge and its rider, with a total mass of 96 kg, emerge from a downhill track onto a horizontal straight track with an initial speed of 42 m/s. What magnitude F is required for the decelerating force
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