Physics 264LProfessor Henry Greenside

Monday 2015-09-21

Class question about free fallA cup of water has two holes drilled near its bottom so the fluid can flow out in two jets. If the cup is now dropped so it falls freely

A. the jets will flow with the same intensity.B. the jets will flow with reduced intensityC. the jets will stop flowingD. bubbles enter through the holes and float to

the top of the fluid.

Class questionA helium-filled balloon is tied to the bottom of a car’s floor as shown. The car then accelerates until it reaches a constant velocity going to the right. Then the balloon:

A. will be in a vertical direction.B. will be tilted to the leftC. will be tilted to the right.

Class questionA helium-filled balloon is tied to the bottom of a car’s floor as shown. If the car then undergoes constant acceleration to the right, the balloon:

A. will be in a vertical direction.B. will be tilted to the leftC. will be tilted to the right.

Excess Precession of Mercury’s Orbit Beyond Newtonian Physics

Observation shows perihelion precession of 5600’ ~ 2o per century, Newton’s predicts 5557’/century so 43’/century excess. GR predicts exactly this value to two digits, with no extra assumptions (no gas, no invisible planet, no distortion of Sun’s shape, etc).

What Speed Will Doppler Shift Red to Green?