All Questions
Tagged with newtonian-gravity projectile
34
questions
32
votes
3
answers
15k
views
What are the precise statements by Shouryya Ray of particle dynamics problems posed by Newton which this news article claims have been solved?
This recent news article (here is the original, in German) says that
Shouryya Ray, who moved to Germany from India with his family at the age of 12, has baffled scientists and mathematicians by ...
- 480
69
votes
7
answers
12k
views
Why do archery arrows tilt downwards in their descent?
In the movies, arrows shot into the air rotate so that during the descent, the arrow head hits ground first. What is the source of this angular momentum? It would seem that the bow string exerts a ...
- 1,548
18
votes
5
answers
9k
views
Elliptical Trajectory, or Parabolic?
Discuss whether this statement is correct: “In the absence
of air resistance, the trajectory of a projectile thrown near the
earth’s surface is an ellipse, not a parabola.”
Is the above statement ...
- 1,921
4
votes
1
answer
3k
views
If a bullet is fired vertically upwards, when it comes back does it fall to the same spot? [duplicate]
What I'm basically asking is that if a body is projected with sufficiently high velocity so that it doesn't escape from the earth's gravitational field but reaches an appreciable height with respect ...
- 777
2
votes
4
answers
2k
views
Projectile/orbital motion over very long distance
We know the optimum angle for greatest horizontal displacement when launching an object with projectile motion is 45 degrees.
How to solve the angle when it is real long distance around the earth ...
- 533
13
votes
7
answers
30k
views
How does gravity affect bullets?
I read recently that if you hold a bullet in one hand and a pistol in the other, both hands at the same height, and subsequently fired the pistol at the same time as dropping the bullet, both bullets ...
- 133
13
votes
2
answers
7k
views
Will a bullet dropped and a bullet fired from a gun horizontally REALLY hit the ground at the same time when air drag is taken into account?
In a world without air, I understand they definitely would. However, with drag taken into account, I think they wouldn't. Since the drag force varies proportional to the square of speed (ignoring the ...
- 305
10
votes
2
answers
5k
views
Put a bullet into orbit around the moon
While I was watching this beautiful video, the absence of air friction pushed me to ask myself: While standing on the surface of the moon, what is the initial velocity by which you can fire a bullet ...
- 221
2
votes
3
answers
7k
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Projectiles and escape velocity [closed]
Q: The escape velocity for a body projected vertically upwards from the surface of earth is 11 km/s. If the body is projected at an angle of $45^\circ$ with vertical, the escape velocity will be?
My ...
- 227
18
votes
7
answers
7k
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Why does the Earth follow an elliptical trajectory rather than a parabolic one?
I was taught that when the acceleration experienced by a body is constant, that body follows a parabolic curve. This seems logical because constant acceleration means velocity that is linear and ...
- 301
13
votes
2
answers
17k
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If starting speed is faster than terminal velocity then what?
If an object is say thrown down (vertically) at an initial speed that is faster than its terminal velocity, what would happen to that objects speed? Would it slow down?
- 189
11
votes
1
answer
9k
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What is the maximum efficiency of a trebuchet?
Using purely gravitational potential energy, what is the highest efficiency one can achieve with a trebuchet counter-weight type of machine? Efficiency defined here as transformation of potential ...
- 3,772
2
votes
1
answer
191
views
In what direction should you throw a 1 kg uniform sphere in order to put it into lower Earth orbit? [closed]
If you are standing on Earth's surface, in what direction (and at what speed) should you throw a 1 kg uniform sphere of radius 0.1 meters in order to put it into lower Earth orbit? Assume that there ...
user109792
-1
votes
2
answers
225
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Escape velocity [duplicate]
I don't understand what escape velocity is. I know escape velocity from the earth is 11,186m/s. If a rocket is launched from the surface of the earth with initial speed of 11,186m/s, does it escape ...
- 1
14
votes
7
answers
4k
views
What does an undefined formula in physics mean?
I am trying to figure out how undefined formulas in mathematics relates to physics. Take the following formula for terminal velocity.
$$V_\text{terminal} = \sqrt{ mg \over{c \rho A}} $$
Say we have ...
- 546