Sunday

January 25, 2015

January 25, 2015

Posted by **Tristan** on Sunday, May 16, 2010 at 10:48pm.

a) What is the resistance of the bar at 0 degrees celcius?

b) What potential difference is needed to push 5000 amps through the bar?

- Physics -
**drwls**, Monday, May 17, 2010 at 5:41amLook up the resistivity of copper. Call it r. For pure copper,

r = 1.67*10^-7 ohm-cm

(a) Multiply "r" by the bar's length (200 cm) and divide by the cross sectional area (10 cm^2), to get the resistance in ohms, R.

(b) V = I * R (volts)

I = 5000 A

Solve for V

**Answer this Question**

**Related Questions**

physics - if theta is the angle between unit vectors A bar and B bar, then (1-A ...

physic - The composite bar BCD in the figure is composed of an inner aluminum ...

electricity - if a bar of copper is brought near a magnet, the copper bar will ...

physics - A 52-kg pole vaulter running at 12 m/s vaults over the bar. Her speed ...

physics - A 42-kg pole vaulter running at 14 m/s vaults over the bar. Her speed ...

math, physics - A. A rectangular slab of concrete is cut from a large block. The...

Physics - A bar of aluminum (bar A) is in thermal contact with a bar of iron (...

Physics - A 60-cm-long, 500 g bar rotates in a horizontal plane on an axle that ...

physics - Hello everyone, I need help with this question: A bartender slides a ...

Physics - A 51.8 kg pole vaulter running at 11.5 m/s vaults over the bar. Her ...