All Questions
8
questions
3
votes
5
answers
183
views
What happens physically when object is thrown up when $v$ becomes 0 at max height?
When velocity=0 during maximum height when an object is thrown up, what does that actually mean?? does that actually mean that the object doesn't change it's position over dt time period when at ...
- 31
1
vote
1
answer
160
views
Derive Newton's Law of Gravitation from Kepler's 3rd Law, Assuming an Elliptical Orbit? [closed]
Can you derive Newton's law of gravitation from Kepler's third law, assuming an elliptical orbit?
Most of what I've seen have been people solving it with a circular orbit. However, I find it ...
- 11
0
votes
1
answer
141
views
Maximum height reached by an object
Here, in the last line, from the formula s is negative, but how can s be negative?
Also, should it not be s=u^2/2g instead of
s= - u^2/2g?
- 13
0
votes
1
answer
70
views
Dynamically changing acceleration of object moving towards sun due to gravity
For a collection of sci-fi short stories set in the rather near future I need an approximation of the time it would take a space ship to travel from an Earth orbit to Ceres.
In a previous story of ...
0
votes
1
answer
6k
views
How to find velocity from gravitational force and mass? [closed]
Trying to find the analytical equation for instantaneous velocity of an object under the influence of gravity (non-uniform acceleration) in a straight line. I am trying to model a stationary massive ...
0
votes
3
answers
28k
views
Acceleration of a ball thrown into the air [duplicate]
A ball sitting in a person's hand is at rest. The ball is thrown into the air. There must be some upward acceleration which is greater than the acceleration due to gravity, since in order for the ball ...
- 103
0
votes
1
answer
933
views
Gravity: Velocity (and distance) as a function of time, but wait; there's more
First, ignore air resistance. Always ignore air resistance.
Using kinematics for gravitational acceleration systems works within a specific scope, and when the system's scope widens too far, they ...
- 307
2
votes
2
answers
449
views
Where are we : On level ground or on a ramp - moving in a train?
Let's say we are traveling in a train. The path has two parts: one at ground-level and the other moving up on the ramp. The ramp has an inclination of $\arctan\frac{a}{g}$ with the horizontal, where $...
- 2,479