Projectile motion airplane speed problem

Click For Summary
An airplane is climbing at 97.5 m/s at a 50-degree angle and releases a package from an altitude of 732 meters. The initial horizontal and vertical velocity components of the package are calculated as 62.7 m/s and 74.7 m/s, respectively. To find the time until impact, the equation for vertical motion is used, but the time calculated appears incorrect at 22 seconds. The discussion confirms that resolving the velocities into X and Y components is the correct approach, and emphasizes the need to determine the Y velocity at impact to calculate the final angle. The focus remains on ensuring the correct application of physics principles to solve the problem.
dethlok777
Messages
1
Reaction score
0
An airplane with a speed of 97.5 m/s is climbing upward at an angel of 50.0 degrees with respect to the horizontal. When the plane's altitude is 732m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point of release, to where the package hits the earth. (b) Relative to the ground, determine the angle of the velocity vector of the package just before impact.

I started this problem by figuring out the velocity components for both the horizontal motion and the vertical motion of the package.
initial velocity of x=the inital velocity*cos(50.0 degrees)=62.7 m/s
initial velocity of y= the inital velocity *sin (50.0 degrees)=74.7 m/s
Then I thought I should find the time it takes for the package to hit the ground. using the equation y=initial velocity component y*t + 1/2(acceleration component of y*t*t)-->-732m=(74.7m/s)t + 1/2(-9.80m/(s*s))t*t = 22s
My question: Is this the direction I should be following to solve this problem or am I totally hosed up on this? Don't want the answer to the overall question but a hint to help me figure this out.
ps sorry about the t*t notation I could not figure out how to do superscripts or subscripts here.
 
Physics news on Phys.org
Yes, you've got a good start on this problem, and resolving the velocities into X and Y is the right way to go. Now you have to determine the Y velocity at the time it hits the ground. With that, you have both the X and Y velocity just before impact, assuming the X velocity hasn't changed and neither velocity is a function of wind resistance. From that you can find the angle it is going upon impact, just as you resolved the X and Y from the initial angle.
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

Similar threads

Replies
40
Views
2K
  • · Replies 11 ·
Replies
11
Views
2K
Replies
11
Views
1K
  • · Replies 18 ·
Replies
18
Views
2K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 6 ·
Replies
6
Views
1K
  • · Replies 21 ·
Replies
21
Views
1K
  • · Replies 6 ·
Replies
6
Views
3K
Replies
18
Views
2K
  • · Replies 15 ·
Replies
15
Views
2K