DJohnM's user avatar
DJohnM's user avatar
DJohnM's user avatar
DJohnM
  • Member for 10 years, 11 months
  • Last seen this week
  • Toronto, Canada
146 votes
Accepted

How do grandfather clocks keep going?

51 votes
Accepted

Conservation of momentum when rain pours into a wagon

43 votes
Accepted

In $_6^{14}\mathrm C$ decay, how is mass-energy conserved?

32 votes
Accepted

How did Kelvin make this fascinating calculation?

27 votes

How does holding a glass prevent it from falling?

26 votes
Accepted

How do astronauts measure weight/mass on other planets?

20 votes

What do units like joule * seconds imply?

18 votes
Accepted

How does an object undergoing circular motion increase its tangential velocity?

14 votes

The effect of A/C and global warming

13 votes
Accepted

How come a whistling kettle starts whistling only when water boils, and not long before - due to hot air escaping under pressure?

12 votes
Accepted

Does wave interference happen only to same frequency waves?

11 votes

How do control rods work?

10 votes

When I drink with a straw, is the atmospheric pressure pushing the water or me sucking it?

10 votes
Accepted

Confusion with Doppler effect problem

10 votes

Behavior of a loose coin on a free fall ride

9 votes

How is the power of water flowing through a pipe directly proportional to $v³$ and not $v²$?

7 votes

Put a bullet into orbit around the moon

7 votes
Accepted

In calculating work done by a constant force over a constant distance, why doesn't the subject's initial velocity matter?

7 votes
Accepted

What provides the centripetal force for a glider?

7 votes

What is happening to rotational kinetic energy when moment of inertia is changed?

6 votes

Pouring water in an aircraft while upside down?

6 votes
Accepted

Can a box on a frictionless rotating table rotate?

6 votes

Can mass be directly measured without measuring its weight?

6 votes

Airplane with banner in a windy day

6 votes

Frequency difference when water splashes at different temperatures

5 votes

What calorimetry approach is this?

5 votes

Doesn't a box holding a vacuum weigh the same as a box full of air?

5 votes

Why do we call a white led with high color temperature "cool"?

5 votes

Isotope with longest decay chain to reach a stable isotope

5 votes
Accepted

Automobile Air bags

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