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Physics is Phun

Physics is Phun. David S. Wright Professor of Physics Tidewater Community College. 7 in 1 Survival Tool. Whistle Compass LED Light Magnifying Glass Mirror Thermometer Empty Space. Inverse Proportion Tool. Whistle Compass LED Light Magnifying Glass Mirror Thermometer Empty Space.

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Physics is Phun

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  1. Physics is Phun David S. Wright Professor of Physics Tidewater CommunityCollege

  2. 7 in 1 Survival Tool Whistle Compass LED Light Magnifying Glass Mirror Thermometer Empty Space

  3. Inverse Proportion Tool Whistle Compass LED Light Magnifying Glass Mirror Thermometer Empty Space

  4. Whistle Intensity= k/r2

  5. Whistle f=k/l

  6. LED Light I=k/r2

  7. Magnifying Glass Totally Inverse 1/f= 1/do + 1/di

  8. Thermometer Liquid in Glass Coiled Bimetal Strip

  9. Bimetal Thermometer Radius=k/DT

  10. Mirror Gives an Inverse of the Image

  11. Without Mirror With Mirror

  12. Compass Magnetic Field (B) of an ideal dipole, measured along its axis?

  13. B=k/r3

  14. Empty Space { }

  15. Physics Olympics Penny Barge

  16. Basket ball and Tennis ball 1 meter

  17. Simultaneous Equations Conservation of Momentum mBvB1+mTvT1=mBvB2+mTvT2 Conservation of Energy ½ mBvB12 + ½ mTvT12 = ½ mBvB22+ ½ mTvT22

  18. vB1=+4.5 m/svB1= 0 m/s vT1 = -4.5 m/s vT1= -9.0 m/s

  19. This “simplifes” the equations: mTvT1=mBvB2+mTvT2 mTvT12 = mBvB22+ mTvT22 Now it’s great fun to solve these!!!

  20. mTvT12 =mB ()2+mTvT22 (mTvT1-mTvT2)/mB mTvT1=mBvB2+mTvT2 becomes vB2=(mTvT1-mTvT2)/mB Then Then some factoring and hand waving occurs…

  21. (mT-mB) vT2= vT1 (mT+mB) Eventually mB=.4 kg mT=.07 kg vT2= 6.3 m/s Vfinal with respect to floor= 10.8 m/s Final Height=5.8 m!!!!

  22. Bed of Nails Ratios: P=F/A

  23. Pressure Elephant’s Foot: 6000 lb Elephant Foot ~ 40 in2 P=F/A=6000 lb/40in2 = 150 psi

  24. Pressure Woman’s Stiletto Heel: 100 lb woman Spike Heel~ 1/16 in2 P=F/A=100 lb/(1/16 in2) = 1600 psi

  25. Bed of Nails 160 lb Professor/320 nails That’s only ½ lb per nail!

  26. Inertia Sylvester's law of inertia The number of eigenvalues that are postive, negative or zero do not change under a congruence transformation. When a quadratic Q in n variables is reduced by a nonsingular linear transformation to the form Q=y12+y22+…+yP2-yP+12-yP+22-…yn2 the number P of positive squares appearing in the reduction is an invariant of the quadratic form Q and does not depend on the method of reduction.

  27. Inertia

  28. Inertia Average FreightTrain55 mph= 1 mile Up to 3300 lbs

  29. Stay at Rest

  30. Stay in Motion

  31. Penny Barge x 10-2x 10-2x x 10 cm x 10 cm

  32. Maximize Volume V= L * W* H L=10-2x W=10-2x H=x V(x)=x(10-2x)2=4x(x2-10x+25) dV/dx=0=4(x2-10x+25)+4x(2x-10) dV/dx=4(3x2-20x+25)=0

  33. Penny Barge Solving by the Quadratic Formula x=5 x=5/3 5/3 cm 6 2/3 cm 6 2/3 cm

  34. Leaf Blower The Leaf blower and toliet paper involves Bernoulli’s Principle, Inertia, Force, Acceleration, but most of all it proves that…

  35. Physics is Phun

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