Lecture Demonstrations Martin Simon Gueorgui Gueorgiev Krysten Cunnigham
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Transcript of Lecture Demonstrations Martin Simon Gueorgui Gueorgiev Krysten Cunnigham
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Lecture Demonstrations
Martin SimonGueorgui GueorgievKrysten Cunnigham
http://www.physics.ucla.edu/demoweb/
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• \demoweb\images\astronaut.mov
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Is this true? I have read in books that when you get into space there is no gravity.
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• Liquid Nitrogen
• melting temperature:
77K, -196C, -320 F• density 1.3g/L
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Gas Atmosphere Boiling point Melt
Nitrogen 78.1% 77 K, -196 C, -320 F 63 KOxygen 20.9% 90 K, -183 C, -297 F 54 KArgon 0.9% 87 K, -186 C, -303 F 84 K
Carbon Dioxide 0.038% 195 K,-78 C, -108 F Helium 4.2 K, -269 C, -452F 0.95 K Water varies 373 K, 100 C, 212 F 273 K
Heat of Fusion (melting) Heat of VaporizationWater 335 kj/kg 2260 kj/kgNitrogen 25.5 kj/kg 201 kj/kg
DensityNitrogen 1.3 g/lOxygen 1.4 g/lCarbon Dioxide 2.0 g/lHelium 0.2 g/l
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• Doppler shifts– doppler horn – ephysics\physlets\doppler_shift.htm
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Ping-Pong Cannon
1 atm = 760 mmHg (Torr) = 14.7 lb/in2
1 lb = 4.448 N1 m = 39.37 inspeed of sound = 343 m/s at 200C
ping-pong ball: diameter = 1.45 in mass = 1 g = 0.001 kgtube length = 68 in
with P = 14.7 lb/in2 W = F*d = (14.7 lb/in2)(* 0.722 in2)(68 in) = 1628 lb in = 183 JW = K = ½ * m * v2 or 183 = ½ * 0.001 * v2
v = 604 m/s
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• Singing Rod Standing Waves
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• Driven Damped Harmonic Oscillator– Equation:
– Solution:
)cos(02
2
tFkxdt
dxb
dt
xdm
)sin()(
)( 022222
02
0
tmbm
Ftx
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• Capacitor • Two Conductors (ie metal plates) separated by an
insulator (example, air) stores charge and energy
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Large Capacitor 400 µF 6 kV 7200 joules
Defibrillator Capacitor 70 µF 5 kV 875 joules200 joules to the body in 2 ms = 100 kW20 amps at 5 kV for 2 ms
20 mA can cause muscle contractions70 mA across torso – heart goes into ventricular fibrillationhigher currents cause heart to stop and usually restart
Dry skin resistance 10,000—1,000,000 Ohms Wet skin 1,000 OhmsWet skin in contact with 120 V power line-- 120/1000 = 120 mA
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• Tesla Picture
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• ePhysics – UCLA’s online electronic physics demonstrations
• Webpage - http://ephysics.physics.ucla.edu/
– ephysics\physlets\1.1\elenses_and_mirrors.htm
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• Sulfur Hexafluoride• Molecular weight 146g/mol• 5 x density of air
• Helium• Molecular weight 4g/mol • 1/7 density of air