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## Balloons, Cannon Balls, Coffee, Monkeys and a Beautiful Sunrise

Posted by Karl Sharman under Tom (54 Responds)

1. A helium-filled balloon is tied to the floor of a car that makes a sharp right turn. Does the balloon tilt while the turn is made? If so, which way? The windows are closed so there is no connection with the outside air. (I’ve tested this)
2. A person in a boat in his own [...]

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## My Shadow is Bigger than Yours!

Posted by Karl Sharman under Tom (28 Responds)

London, Mid-day, Summer Equinox. Nelson’s Column. How much does it’s shadow weigh? Or perhaps the reverse is true? Does light somehow impose weight on an object, any object at all? The shadow weighs nothing… or less than nothing?
This comes from staring at the sun for too long!

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## Einstein, Newton and the Bullet

Posted by Karl Sharman under Tom (25 Responds)

You are a weapons manufacturer and you have just developed a gun that fires a bullet at 0.9c (c is the speed of light, y’know – e=mc2 and all that…?)
You are having a chat with a friend of yours who has just developed a new car that travels at 0.9c (It’s a Toyota Avensis…)
During this [...]

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## Weighty Problem

Posted by Chris under SharedPuzzle (6 Responds)

Pinched from the old ToM site.
A rope of length L metres and mass M kg is suspended vertically by one end with the other end just touching a weighing scale (calibrated in kg).  The rope is released.  At the moment just before the entire rope has fallen onto the scale what does the scale read?
Assume the rope [...]

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