User bobie - Physics Stack Exchange

19 votes

6 answers

23k views

The best way in which a man can pull a train

asked Sep 2, 2014 at 12:48

19 votes

5 answers

5k views

How is potential energy actually stored in a steel spring at the atomic level?

asked Nov 15, 2014 at 5:59

13 votes

2 answers

3k views

How can a metal heated at 600° emit thermal photons at 4000°+?

asked Aug 6, 2014 at 10:11

7 votes

2 answers

533 views

Is it possible to determine the outcome of any impact knowing only the ratio of masses? [duplicate]

asked Jan 17, 2015 at 9:38

6 votes

3 answers

4k views

Newton's first law: is his concept of (force of ) inertia still useful and used?

asked Sep 10, 2014 at 6:24

5 votes

1 answer

4k views

Are there perfect elastic collisions in Nature?

asked Oct 17, 2014 at 13:55

4 votes

2 answers

553 views

Can a wave propagate in any substance? Aren't there any prerequisites?

asked Aug 13, 2014 at 14:44

3 votes

2 answers

4k views

How to calculate wasted energy

asked Sep 14, 2014 at 7:01

3 votes

2 answers

322 views

Why is it more convenient to consider spacetime as a continuum?

asked Aug 9, 2014 at 8:39

3 votes

1 answer

317 views

If gravitational radiation (or anything) cannot escape a black hole, how can it produce redshift or curve spacetime? [duplicate]

asked Aug 5, 2014 at 9:30

3 votes

7 answers

2k views

Can energy be created and destroyed?

asked Nov 6, 2014 at 7:20

2 votes

2 answers

474 views

Wasted energy applying a torque

asked Sep 20, 2014 at 10:44

2 votes

4 answers

339 views

What experiment would disprove Friedmann model of cosmology?

asked Aug 8, 2014 at 10:42

1 vote

2 answers

1k views

If a ball spinning on a rod hits another ball, what is conserved linear or angular momentum?

asked Aug 7, 2014 at 10:59

1 vote

2 answers

992 views

Does the formula $ \theta = \frac{v}{c} $ to find out deflection of light make sense?

asked Aug 5, 2014 at 13:19

1 vote

1 answer

407 views

Is there any difference between a proper photon and a photon of thermal radiation?

asked Aug 5, 2014 at 8:41

1 vote

2 answers

492 views

If an asteroid were threatening the Earth, could I deviate it just by jumping on it?

asked Sep 15, 2014 at 9:47

0 votes

1 answer

3k views

Why does a green glass block more UVA/B rays than a blue one?

asked Aug 26, 2014 at 7:17

0 votes

4 answers

5k views

Can momentum be conserved in a perfectly elastic collision?

asked Aug 26, 2014 at 14:35

-1 votes

4 answers

420 views

Who foots the (magnetic) energy bill?

asked Aug 29, 2014 at 13:56

-1 votes

7 answers

687 views

Could Galileo ever prove that $g$ is the same for a feather and a hammer?

asked Nov 13, 2014 at 6:56

-2 votes

1 answer

2k views

Deflection of light by the Sun

asked Aug 3, 2014 at 10:13

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22 Questions

The best way in which a man can pull a train

How is potential energy actually stored in a steel spring at the atomic level?

How can a metal heated at 600° emit thermal photons at 4000°+?

Is it possible to determine the outcome of any impact knowing only the ratio of masses? [duplicate]

Newton's first law: is his concept of (force of ) inertia still useful and used?

Are there perfect elastic collisions in Nature?

Can a wave propagate in any substance? Aren't there any prerequisites?

How to calculate wasted energy

Why is it more convenient to consider spacetime as a continuum?

If gravitational radiation (or anything) cannot escape a black hole, how can it produce redshift or curve spacetime? [duplicate]

Can energy be created and destroyed?

Wasted energy applying a torque

What experiment would disprove Friedmann model of cosmology?

If a ball spinning on a rod hits another ball, what is conserved linear or angular momentum?

Does the formula $ \theta = \frac{v}{c} $ to find out deflection of light make sense?

Is there any difference between a proper photon and a photon of thermal radiation?

If an asteroid were threatening the Earth, could I deviate it just by jumping on it?

Why does a green glass block more UVA/B rays than a blue one?

Can momentum be conserved in a perfectly elastic collision?

Who foots the (magnetic) energy bill?

Could Galileo ever prove that $g$ is the same for a feather and a hammer?

Deflection of light by the Sun