User JMac - Physics Stack Exchange

329 votes

Accepted

Why do ballpoint pens write better on pages that have pages below them?

answered Oct 8, 2017 at 14:00

90 votes

Birds on a wire (again) - how is it that birds feel no current? They are just making a parallel circuit, no?

answered Mar 26, 2020 at 13:36

86 votes

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Why does the shower curtain move towards me when I am taking a hot shower?

answered Jun 28, 2017 at 9:52

63 votes

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Why is the potential energy of a spring the same when it is compressed and stretched?

answered Sep 6, 2017 at 13:56

63 votes

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Is this cheap "air conditioner" able to cool a room?

answered Aug 7, 2019 at 18:05

41 votes

How can any speed be defined as a constant?

answered Mar 30, 2020 at 16:22

29 votes

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How can a horse move a cart if they exert equal and opposite forces on each other according to Newton's third law?

answered Sep 29, 2020 at 14:15

24 votes

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Can a water vortex (whirlpool) be used to efficiently store energy?

answered Sep 6, 2018 at 10:41

22 votes

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Intuition - why does the period not depend on the amplitude in a pendulum?

answered Jul 20, 2017 at 14:08

21 votes

Ice cube in a thermally isolated system ... Will any of it melt?

answered Feb 5, 2018 at 13:10

19 votes

Reversed First Joule's Law : heating a resistor produce voltage?

answered Sep 8, 2017 at 17:16

15 votes

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Why does the freezing point matter when picking cooler ice packs?

answered Apr 1, 2019 at 17:59

15 votes

How does a car gain kinetic energy?

answered Jan 16, 2020 at 14:07

12 votes

Why does the Pascal's barrel experiment need a tall column of water?

answered Oct 9, 2021 at 1:08

11 votes

Pressure in giant ball of water floating in space

answered Jul 5, 2019 at 0:04

11 votes

Does centrifugal force stiffen a rotating blade?

answered Jul 17, 2017 at 20:46

10 votes

Why is speed defined like it is?

answered Jul 30, 2017 at 18:34

10 votes

Accepted

rounding when doing calculation in physics

answered Jan 20, 2017 at 15:45

10 votes

What is the 'weight' (not mass!) of the Earth?

answered Aug 17, 2017 at 21:35

10 votes

What is the difference between vapour and steam?

answered Feb 16, 2018 at 14:23

9 votes

Why does air resistance affect projectile motion in the way it does?

answered Mar 1, 2018 at 22:44

9 votes

How is ideal gas law applicable to real gas?

answered Mar 13, 2017 at 11:58

8 votes

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Why does a wet towel become more hot than a dry one?

answered Jan 30, 2017 at 12:30

7 votes

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Strange unit $kg/m$ - How to interpret?

answered Feb 10, 2017 at 16:22

7 votes

Why water is so good at stopping certain bullets?

answered Aug 17, 2017 at 19:30

7 votes

Accepted

Buoyant force when object is between two liquids

answered Mar 20, 2019 at 14:49

7 votes

Are springs compressed by energy, or by momentum?

answered Jun 19, 2019 at 14:51

7 votes

Can you model cold as flowing?

answered Aug 23, 2022 at 12:08

7 votes

Sand leaking out of bag and skater

answered Oct 4, 2020 at 1:45

6 votes

Accepted

Can the formula of buoyancy be used in this arrangement?

answered Nov 9, 2020 at 19:37

Stack Exchange Network

413 Answers

Why do ballpoint pens write better on pages that have pages below them?

Birds on a wire (again) - how is it that birds feel no current? They are just making a parallel circuit, no?

Why does the shower curtain move towards me when I am taking a hot shower?

Why is the potential energy of a spring the same when it is compressed and stretched?

Is this cheap "air conditioner" able to cool a room?

How can any speed be defined as a constant?

How can a horse move a cart if they exert equal and opposite forces on each other according to Newton's third law?

Can a water vortex (whirlpool) be used to efficiently store energy?

Intuition - why does the period not depend on the amplitude in a pendulum?

Ice cube in a thermally isolated system ... Will any of it melt?

Reversed First Joule's Law : heating a resistor produce voltage?

Why does the freezing point matter when picking cooler ice packs?

How does a car gain kinetic energy?

Why does the Pascal's barrel experiment need a tall column of water?

Pressure in giant ball of water floating in space

Does centrifugal force stiffen a rotating blade?

Why is speed defined like it is?

rounding when doing calculation in physics

What is the 'weight' (not mass!) of the Earth?

What is the difference between vapour and steam?

Why does air resistance affect projectile motion in the way it does?

How is ideal gas law applicable to real gas?

Why does a wet towel become more hot than a dry one?

Strange unit $kg/m$ - How to interpret?

Why water is so good at stopping certain bullets?

Buoyant force when object is between two liquids

Are springs compressed by energy, or by momentum?

Can you model cold as flowing?

Sand leaking out of bag and skater

Can the formula of buoyancy be used in this arrangement?