Physics 12

Mr. Jean

November 19th, 2012

The plan:

• Video clips of the day

• Movember

• Thursday’s Lab

• Who killed the Hindenburg?

• Ohm’s Law

Thursday’s Lab:

• Resistance Through a wire

• Mr. King’s Room

• Scan Section p.88

• Page 709

The Hindenburg:

• The pride of Germany and a wonder of it’s time. The zeppelin was nearly 3 football fields long and was the largest flying machine that had even been build.

• The Hindenburg was landing on May 6th, 1937. As the crews started to tie down the drop lines it was noticed ripples in the fabric about one third of the way forward from stern.

• Within 32 seconds the ship exploded, burnt and hit the ground.

Video:

Problem Solving Activity:

Who killed the Hindenburg?

Hindenburg:

• The Hindenburg disaster took place on Thursday, May 6, 1937, as the German passenger airship LZ 129 Hindenburg caught fire and was destroyed during its attempt to dock with its mooring mast at the Lakehurst Naval Air Station, which is located adjacent to the borough of Lakehurst, New Jersey. Of the 97 people on board (36 passengers, 61 crew), there were 35 fatalities as well as one death among the ground crew.

The Hindenburg:

• When the Hindenburg was landing the potential energy of the air was higher than the potential energy on the ground.

• Because it was raining the ropes used to guide and land the craft acted as a wire transferring the electricity.

• The electricity caused the hydrogen to heat up and explode.

• Random useless information: – Early on, before Led Zeppelin made it big, they were

told that their music would go over like a lead filled Zeppelin. They changed the spelling of led to make sure they were not considered the first zeppelin.

Ohm’s Law:V = IR

• V = Potential difference in volts (v)

• I = Electric current in amperes (A)

• R = Resistance in ohms (Ω)

• 1A * 1Ω = 1V

Unit of resistance:

• One ohm is defined as the amount of electric resistance that will allow one ampere of current to move through the resistor when a potential difference of one volt is applied across the resistor.

Example:

• What is the resistance if a battery with 9.0V of potential difference causes a current of 0.45A to pass through a resistor?

Example:

• What is the resistance if a battery with 9.0V of potential difference causes a current of 0.45A to pass through a resistor?

Phet Sims:

• http://phet.colorado.edu/en/simulation/circuit-construction-kit-ac

• http://phet.colorado.edu/en/simulation/travoltage

Ohm’s Law Questions:

• P. 714

• Questions: 21-24