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Results tagged with homework-and-exercises
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user 86444
Applies to questions of primarily educational value - not only questions that arise from actual homework assignments, but any question where it is preferable to guide the asker to the answer rather than giving it away outright. Please READ THE GUIDANCE IN META before asking homework-like questions.
1
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What would be the minimum size of a planet which would allow a human being to walk around wi...
The Earth has an average density of about 5500 kg/m^3. For a small planet, the density would be pretty similar throughout. Therefore the force of gravity you would experience on a planet with Earth de …
1
vote
1
answer
637
views
Rocket velocity during fuel burn [closed]
I know the formula for the velocity of a rocket after the on board fuel has been used up:
$$ \Delta v = v_{ex} \ln\left( \frac{m_i}{m_e} \right) - gt $$
where:
$v_{ex}$ is the exhaust velocity
$m_ …
1
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Why is friction force negative in ice skater problem?
When the skater is on the ice, friction stops him/her in 3.52 seconds as you said. The molecules in the skates rub against the molecules in the ice, and the ice molecules absorb some of the skate mole …