All Questions
Tagged with newtonian-gravity projectile
198
questions
8
votes
2
answers
155
views
Error concerning projectile motion in respected textbook?
In the textbook Fundamentals of Physics by R. Shankar of Yale Open Courses, appears the following assertion pertaining to a car driving off a cliff, which seems correct:
This is exactly how long it ...
- 181
0
votes
0
answers
47
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Rocket equation non-constant gravity
I am currently trying to teach myself differential equations and wondered about the following problem.
You have an object (a rocket of constant mass $m_r$) and initial velocity $v_0$ that tries to ...
- 253
2
votes
1
answer
40
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Trajectories of projectile based on different speeds of projection [duplicate]
So my teacher was teaching gravitation and an interesting fact that he mentioned was the trajectory of a projectile projected from Earth at a speed equal to escape velocity, is parabolic.
Also, he ...
- 21
0
votes
1
answer
43
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Terminal velocity gravity against first-order drag force
Let's say that we have a falling object with two forces acting on the object:
gravity $F_g = mg$ and a first order drag force $F_d = kv$.
Terminal velocity will be reached when gravity is equal to the ...
- 665
1
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2
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81
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Dropping a stick down with an angle
Let's say that we drop a stick down with an angle, meaning that the stick is not parallel to the ground. Assume there is only gravity. Is it correct that the orientation of the stick will not change ...
- 665
2
votes
3
answers
50
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Constant speed (at terminal velocity) and zero $g$
I have read the question What would a person experience in a free-falling elevator in a shaft long enough to reach terminal velocity? here and the answer was that you feel exactly the same if the ...
- 129
7
votes
7
answers
3k
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How do objects reach terminal velocity?
I understand the basics of this principle: the force of gravity acting downward on an object becomes equal to the air resistance acting upward on the object because as the object speeds up, air ...
- 539
1
vote
3
answers
87
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How does a mass ejected at escape velocity keep moving till infinity?
I've studied that if a mass is ejected from the surface of the Earth at 11.2 km/s (or at any point above the surface at a lower Ve), it 'escapes' to infinity.
Does that not imply a violation in the ...
- 133
1
vote
1
answer
109
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Projectile of an object thrown from rotating planet
Last night I couldn't sleep for some time because of thinking this problem. The starting point of this problem was actually "If we were to jump perfectly vertically on earth, would we land on the ...
0
votes
0
answers
48
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Problem on orbital motion
Let's say an object is thrown from Earth with a speed of v at an angle $\theta$. An ellipse is formed with the center of Earth as its foci(given in the figure).
We know that $v_x^2=2GM(\frac{1}{r_x}-\...
- 91
3
votes
1
answer
267
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Does something similar to a gravitation impulse exist?
Let there be a block of mass $M$ sitting on top of a table. there is a hole in the table right under the center of mass of the block.
A bullet of mass $m$ is shot through this hole and it hits the ...
- 629
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votes
2
answers
78
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Dropping a skyscraper (hypothetical question)
This is hypothetical question: imagine a tall skyscraper says 1000m tall is lifted by a nign indestructible cables attached only at the top of the building. When the cable is released what happens? ...
- 13k
0
votes
1
answer
41
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Does it takes more or less effort to dribble in a micro-$g$ environment?
Imagine an astronaut is practicing with a standard official basketball on an orbiting space station. Assume everything is in free fall so I wonder would it consume less or more effort to dribble ...
- 13k
0
votes
1
answer
39
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Air Friction Newton III
I have question to the Newton III Law and Air Friction.
At the free Fall of a Body there is an Air Friction, which is in oppopsite direction to the Gravitation Force. In my opinion the Body pushes to ...
- 1
1
vote
3
answers
77
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What are the conditions that produce various shapes in 2D motion?
I have read that projectile motion is parabolic in nature. I know that the equation of projectile motion represents a parabola. But when do we get a parabolic curve? Does it happen when there is ...
