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Hứa Toàn Phong

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MATH PUZZLE: Can you replace the question mark with a number?

Robert Mayer

Died 20 Mar 1878 at age 63 (born 25 Nov 1814). Julius Robert Mayer was a German physicist who, while a ship's doctor sailing to Java, considered the physics of animal heat. In 1842, he measured the mechanical equivalent of heat. His experiment compared the work done by a horse powering a mechanism which stirred paper pulp in a caldron with the temperature rise in the pulp. He held that solar energy was the ultimate source of all energy on earth, both living and nonliving. Mayer had the idea of the conservation of energy before either Joule or Helmholtz. The prominence of these two scientists, however, diminished credit for Mayer's earlier insights. James Joule presented his own value for the mechanical equivalent of heat. Helmhotlz more systematically presented the law of conservation of energy.

Stopped for speeding

A man who is driving a car is stopped by a police officer. The following exchange takes place . . . The man says, 'What's the problem, Officer?'

Officer: 'You were going at least 75 in a 55-zone.'

Man: 'No Sir, I was going 65.'

Wife: 'Oh, Harry, you were going 80.' (The man gives his wife a dirty look.)

Officer: 'I'm also going to give you a ticket for your broken tail light.'

Man: 'Broken tail light? I didn't know about a broken tail light!'

Wife: 'Oh, Harry, you've known about that tail light for weeks.' (The man gives his wife another dirty look.)

Officer: 'I'm also going to give you a citation for not wearing your seatbelt.'

Man: 'Oh, I just took it off when you were walking up to the car.'

Wife: 'Oh, Harry, you never wear your seatbelt.'

The man turns to his wife and yells, 'SHUT YOUR MOUTH!'

The Officer turns to the woman and asks, 'Ma'am, does your husband talk to you this way all the time?'

The wife says, 'No, only when he's been drinking!!!'

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