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Q1. The density of free electrons in gold is 5.90 x 10^28 m-3. The resistivity of gold is 2.44 x 10-8 at a temperature of and the temperature coefficient of resistivity is 0.004 ()-1. A gold wire, 1.30mm in diameter and 27cm long, carries a current of 270mA. The electric field in the wire is closest to?
Q2. Some good estimates about the human body can be made if it is assumed that we are made mostly of water. The mass of a water molecule is 2.99 x10-26 kg. If the mass of a person is 62.0 kg, estimate the number of water molecules in that person.
Where does package hit the ground relative to the point
A tow truck pulls a car 5.2 km along a horizontal roadway using a cable having a tension of 790.
What is first order diffraction angle of light
A 4.80 long, 600 steel beams extends horizontally from point where it has been bolted to the framework of a new building under construction. A 75 construction worker stands at the far end of beam.
find out the magnitude of an acceleration
A proton starting from rest is accelerated in a cyclotron to a speed of 3.0•106 m/s. Find the work done on a proton by the electrical force of the cyclotron.
A coiled telephone cord forms a spiral with 56 turns, a diameter of 1.30 cm, and an unstretched length of 60.0 cm. Determine the self-inductance of one conductor in the unstretched cord.
The parallel metal plate of a capacitor is detached by a distance of 0.5cm and is connected to a 90v battery. Find the electric field between them and surface charge density on the plate.
What is speed of the command module
Does an apple tree exert a gravitational force on the earth and if so, how large of a force? Consider and explain this question when the apple is attached to the tree, and when it is falling.
The coefficient of kinetic friction is 0.50. A horizontal force of magnitude 87 N begins to pull directly on the block. In unit-vector notation, what are the resulting accelerations of (a) block and (b) slab.
A rocket is fired at a speed of 75.0 m/s from ground level, at an angle of 60.0 degrees above the horizontal. The rocket is fired toward the ground 11.0-m high wall, which is located 27.0 m away. By how much does the rocket clear the top of the wa..
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