The projectile tag has no wiki summary.
3
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2answers
190 views
Projectile motion along the earth
Suppose a projectile is launched from the Earth's surface with initial velocity $v_0$ well below speed of light and initial angle $\theta_0$ with respect to the vertical line perpendicular to the ...
5
votes
2answers
163 views
Is there an intuitive explanation for the Southward force caused by the Coriolis Effect on rotating spheres?
From the Coriolis Effect article on Wikipedia, the following with regard to the Coriolis Effect on a rotating sphere:
By setting vn = 0, it can be seen immediately that (for positive φ and ω) a ...
1
vote
2answers
121 views
Kinetic Energy of Stone
If a stone is launched upward, of which is subject to gravity and air resistance, which of the following will have a greater kinetic energy? The stone at a point on its way up, or the stone at the ...
2
votes
2answers
170 views
Parabolic motion and air drag
Are this equations correct, in order to calculate the parabolic motion of an arrow with the computation of the drag with the air?
$$
\begin{cases}
x(t)=\left(v_0-\frac{1/2C_DA\rho ...
2
votes
1answer
113 views
Parabolic Motion
I was wondering if I was right about this simple problem:
A projectile is shot at an angle of 37.0° with the horizontal. The velocity of the projectile at its peak height is 16 m/s.
Then I was told ...
3
votes
3answers
417 views
Free falling objects
My teacher and I are in the middle of an argument because she says that if you were to drop two objects at the same time and the same height, but with different initial velocities, both of them would ...
0
votes
2answers
88 views
Proof of $T=\sqrt{2y/a}$ in uniformaly accelerating object [closed]
Suppose that there is a object that does a y-axis-only free fall to ground. The initial distance from the ground is defined as $H$.
How does one prove that time the object takes to reach the ground ...
1
vote
1answer
451 views
Friction due to air drag at high speeds
I am trying to set up this problem, but I am not sure how to go about doing so. (From University Physics, Young & Freedman):
You throw a baseball straight up. The drag force is proportional to
...
26
votes
6answers
22k views
Could someone jump from the international space station and live?
Felix Baumgartner just completed his breathtaking free-fall skydiving jump from $120,000\,\text{feet} = 39\,\text{km}$ above the Earth, breaking the speed of sound during the process.
I was wondering ...
4
votes
4answers
2k views
How Felix Baumgartner has reached the speed of sound quickly
I have watched Felix Baumgartner freefall; but I wonder how Felix has reached the speed of sound quickly, in a matter of some seconds, then we had no idea of its speed?
Any explanation please.
0
votes
1answer
90 views
Time of a ball going up and down with air resistance
A ball is shot directly upward, and then it comes back to the place where it was shot. Suppose we have air resistance. Suppose $t_1$ is the time period from the moment that the ball was shot to the ...
0
votes
1answer
157 views
How can the Air friction force be applied to an object?
Suppose we have an object and we throw it straight upward in the air. How do we apply the Air friction force to this object while moving upwards and after that downwards? Sorry if it's easy because ...
2
votes
1answer
124 views
Galilean relativity in projectile motion
Consider a reference frame $S^'$ moving in the initial direction of motion of a projectile launched at time, $t=0$. In the frame $S$ the projectile motion is:
$$x=u(cos\theta)t$$
...
0
votes
1answer
126 views
Proving $t=(1+\sqrt{1+2hg/v^2 } ) (v/g)$ for a thrown ball
If we throw a ball from the hight point $h$ from the earth, with initial velocity $v’$, how to prove that the time it takes the ball to reach the earth is given by:
...
0
votes
0answers
124 views
How to calculate acceleration of a falling ball [closed]
If a ball was thrown or fell at an angle, given a starting height, and how far away the ball landed (ignoring air resistance) how would you calculate how fast it was going? (I'm guessing is meters per ...
1
vote
2answers
1k views
Equations for an object moving linearly but with air resistance taken into account?
I know (from Kinematics) that for an object moving linearly with an acceleration and without air resistance the following equations can be used to determine v(velocity) or x(position of the object) at ...
0
votes
0answers
202 views
Projectile Motion
I know the angle at which a projectile is launched, how far it needs to go, and also the maximum height. How can I find the initial velocity needed (disregarding air resistance)?
Currently, I am ...
0
votes
2answers
843 views
How do you calculate angle of projection?
At what angle the projectile should throw with initial velocity v in order to reach distance d? discard the air resistance, only gravitation acts. So far I got the equations for horizontal and ...
2
votes
3answers
134 views
What is the general approach to calculating time of impact in 3D?
Given two objects a and b moving at fixed velocities, how would you determine (a) whether they will collide at all, and if so, (b) time of impact?
(Let us assume these are spherical bodies each with ...
0
votes
0answers
389 views
Angle needed to launch a projectile to a given destination at a different height with given initial velocity
I need to calculate the angle required to launch a projectile from point A to point B on an uneven ground, given the parameters.
0nly gravity acts on the projectile – no air resistance.
Parameters ...
2
votes
1answer
490 views
The trajectory of a projectile launched from a hilltop
Here is the problem:
A boy stands at the peak of a hill which slopes downward uniformly at angle $\phi$. At what angle $\theta$ from the horizontal should he throw a rock so that it has the greatest ...
2
votes
1answer
113 views
Is it possible to use a powder-based firearm in space?
A firearm relies upon some kind of explosive powder to drive the slug out of the barrel.
My guess however is that in space (at GEO, or higher) a firearm would be unusable due to the extremes of ...
1
vote
1answer
738 views
Simple projectile motion problem [closed]
A person wants to throw an object from the top of a tower $9,0m$ high towards a target which is $3,5m$ far from the place where the person is launching the object. Suppose that this object is thrown ...
3
votes
3answers
403 views
Does wind speed things up or accelerate things?
This question may seem odd, but I can't think of anything better. So I'll go straight to the point.
Let's say there's a projectile in air going east, shot at a certain angle, with a certain speed. ...
0
votes
1answer
343 views
How calculate the angle to launch an object at the maximum distance?
Suppose that you want to launch an object that travels the longest distance, given the starting speed (or the force applied). You have to determine the angle that al you to reach the longest distance, ...
2
votes
1answer
11k views
Solving for initial velocity required to launch a projectile to a given destination at a different height
I need to calculate the initial velocity required to launch a projectile at a given angle from point A to point B. The only force acting on the projectile after launch will be gravity – zero air ...
0
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0answers
97 views
Simple: What do these ballistic impact numbers represent?
I bought physics for game programmers, found here, today to study ballistic impact, but I'm confused as to where a few numbers are coming from. I'm basically looking to understand what the values ...
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votes
1answer
1k views
Question on Projectile Motion equation [closed]
A golf ball is shot into the air from the ground. If the initial
horizontal velocity is 20m/s and the initial vertical velocity is
30m/s, what is the horizontal distance the ball will travel ...
1
vote
1answer
699 views
Trajectory of projectile thrown downhill
I'm teaching myself mechanics, and set out to solve a problem determining the optimum angle to throw a projectile when standing on a hill, for maximum range. My answer seems almost plausible, except ...
1
vote
1answer
1k views
Simple Projectile Motion Question
A volcano erupts 50m below the sea level. A rock leaves the crater at 20 m/s at an angle 30 deg with the vertical line. The rock has a mass of 15kg. IGNORE WATER RESISTANCE. It gets out of the water, ...
6
votes
3answers
2k views
Why does a bullet bounce off water?
It is known that bullets can ricochet off a body of water. Is surface tension responsible for this or is this the same behavior we see when an asteroid ricochets off the atmosphere? I don't think ...
0
votes
1answer
650 views
How do you calculate instantaneous velocity in projectile motion?
An object is thrown horizontally with a velocity of 30 m/s from the top of a tower. It undergoes a constant downward acceleration of 10 m/s2. The magnitude of its instantaneous velocity after 4.0 ...
0
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1answer
1k views
Maximum range of a projectile (launched from an elevation)
If a projectile is launched at a speed $u$ from a height $H$ above
the horizontal axis, and air resistance is ignored, the maximum
range of the projectile is $R_{max}=\frac ug\sqrt{u^2+2gH}$, ...
0
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1answer
107 views
Bullet fired at a series of partitions
Imagine a bullet fired at a series of partitions stacked one after the other. Given that the bullet looses half its velocity in crossing each partition, velocity of the same is a geometric ...
0
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1answer
222 views
Calculating the launch angle of a horizontal launch (mechanics) [closed]
I need some help with the following question:
A smooth spherical object (the first object) is projected horizontally from a point of vertical height H = 26.38 metres above horizontal ground with a ...
1
vote
1answer
3k views
How to find maximum velocity
I stack a question about projectile question.
The question was
A projectile is being launched from ground level with no air resistance. You want to avoid having it enter a temperature inversion ...
-1
votes
2answers
1k views
How to find minimum velocity without time? [closed]
I have a physics problem that says
A 76.0-kg boulder is rolling horizontally at the top of a vertical cliff that is 20m above the surface of a lake. The top of the vertical face of a dam is ...
2
votes
2answers
317 views
How to calculate a firing location from point of impact data?
I would like to know how to calculate the point at which a bullet is fired from a gun given information from the scene where the bullet falls. The scene would contain the point of impact (GPS ...
2
votes
8answers
1k views
Real world examples for projectile thrown upwards or downwards
I am preparing a physics course for high school about projectile motions. If a projectile moves with initial velocity $v_0$ in the gravitational field of the earth, the equation
$$
s(t) = 1/2 g t^2 ...
3
votes
1answer
1k views
How to modify the bullet trajectory based on the ballistic coefficient?
I am new to the physics surrounding bullet trajectory and how it is calculated. I am a software developer and I am working on a ballistics calculator for rifles. I am using wiki for the trajectory ...
2
votes
3answers
96 views
How can I modify the bullet trajectory based on the ballistic coefficient? [duplicate]
Possible Duplicate:
How to modify the bullet trajectory based on the ballistic coefficient?
I am new to the physics surrounding bullet trajectory and how it is calculated. I am a software ...
1
vote
0answers
209 views
Projectile motion equations @ very (!) high starting velocity
I've already searched Physics StackExchange for some similar question but I didn't find anything about this.
Assumptions:
Earth is a perfect sphere with it's core (X,Y,Z) -> (0,0,0) as a ...
0
votes
1answer
463 views
Projectile motion question: vertical and horizontal graph
I've have got some vertical and horizontal distances for a projectile-like motion.
In order to work out the trajectory, why is it better to plot on the x-axis, "horizontal distance^2", and on the y ...
1
vote
1answer
114 views
Would a projectile keep going forever in empty space?
Would a projectile fired in space and assuming there were no stars or planets in the way, would the projectile continue on to infinity, since the x-component of the projectile's velocity never changes ...
0
votes
0answers
51 views
Upward Movment Proyectiles [closed]
A ball is thrown upward with a speed and direction such that it reaches a maximum height of 16.0 m above the point it was released. At its maximum height it has a speed of 18.0 m/s. With what speed ...
2
votes
2answers
874 views
Bullet trajectory at different angles
I've read from different sources (can't find them online) that firing a bullet at different angles from horizontal will result in differing amount of bullet drop.
For example, a gun is fired at a ...
2
votes
1answer
271 views
Realistic projectile motion
I am working on a project involving a simulation of the motion of a projectile (in 3D) aimed at a moving target. The way projectile motion is analyzed in most introductory physics books is not ...
1
vote
1answer
233 views
If someone shoots a gun (45 caliber) at someone holding up a table or desk 10 feet away, does it slow or turn the bullet away?
Assume it's a standard .45 caliber handgun. Shooter is 10 feet away, and we hold a desk, mini-table, blackboard, etc on our chests(to protect vitals).
How do you figure out the bullet's decrease in ...
1
vote
1answer
133 views
Is it theoretically possible for the orientation angle of a projectile to remain exactly equal to the orientation of velocity?
This question is sparked by my answer to this question: Is this simulation following real physics?
After examining the math, I don't see how it is theoretically possible for the situation simulated ...
0
votes
2answers
126 views
In a 2D problem with a thrown object, why is the acceleration along the x-axis equal to 0?
I'm starting Physics, and I don't understand why the acceleration along the x-axis is zero for an object thrown near the surface of the Earth. This may be problem specific, but I wouldn't know since I ...
