A cylindrical tungsten filament 16.0 cm long with a diameter of 1.00 mm is to be used in a machine for which the temperature wil
l range from room temperature (20⁰ C) up to 120⁰ C. It will carry a current of 12.5 A at all temperatures ( Resistivity of tungsten at 20⁰ C is 5.25×10−8Ωm, the temperature coefficient of resistivity at 20⁰ C is 0.0045 ⁰ C-1) a) What will be the maximum electric field in this filament? Express your answer using two significant figures.
b) What will be its resistance with that field? Express your answer using two significant figures.
c) What will be the maximum potential drop over the full length of the filament? Express your answer using two significant figures.
The equal and opposite reaction to the gravitational force of the Earth pulling down on a man standing on the beach is the gravitational force of the man pulling up on the Earth. <em>(A)</em>
To put it in other words ... which should begin to blow your mind if you just take a moment to think about them ...
Your weight on Earth is exactly equal to the Earth's weight on YOU.