Intitial velocity from given angle and distance

  • Thread starter Thread starter morganm725
  • Start date Start date
  • Tags Tags
    Angle Velocity
AI Thread Summary
To determine the takeoff speed of an athlete executing a long jump at a 30° angle over a distance of 8.30 m, kinematic equations and trigonometric functions are essential. The problem lacks specific height data, leading to the assumption that height can be ignored for this calculation. The key questions involve finding the time at which the athlete's height returns to zero and the total distance traveled during that time. The absence of time and air resistance complicates the solution. Ultimately, the focus remains on using the given angle and distance to calculate the initial velocity effectively.
morganm725
Messages
2
Reaction score
0
1. An athlete executing a long jump leaves the ground at a 30° angle and travels 8.30 m.
What was the takeoff speed?

Homework Equations


Just the kinematic equations and trig functions.


The Attempt at a Solution


I don't even know where to begin solving the problem. I've tried using half the distance as a measurement but that wasn't correct.
 
Physics news on Phys.org
whats the height of the athete as a function of time after he takes of?

at what value of t does this height become zero again?

how much has the athlete traveled in that time.

(of course an athlete is a point mass in this kind of problem)
 
there is no height given, so I assume we ignore the height. The athlete has traveled 8.30m (no time given) and we ignore air resistance and his height.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

How do you find the initial velocity of a projectile given angle/distance?
Replies
3
Views
2K
Achieving Record Distances in the Hammer Throw
Replies
1
Views
3K
An athlete executing a long jump leaves the ground at a 29.5
Replies
4
Views
2K
Write an expression w1 of the angle shown in the first picture
Replies
4
Views
2K
I need opinions on a Projectile Motion problem that I made up
Replies
11
Views
2K
Find Initial Velocity from Angle and Horizontal Distance
Replies
1
Views
9K
Man pulling a boat along the water with a rope (from above on a steep bank)
Replies
31
Views
1K
Find Initial Velocity Given Height, Range, and Initial Angle
Replies
4
Views
2K
Exciting distance problem Only 2 variables are given.
Replies
6
Views
11K
Need help with velocity, acceleration, time and distance
Replies
11
Views
3K

Hot Threads

Recent Insights

Back
Top