Help with projectile motion-type question

  • Thread starter Thread starter aisha001
  • Start date Start date
  • Tags Tags
    Projectile
AI Thread Summary
To solve the projectile motion problem involving a model rocket, first establish the horizontal and vertical components of motion. The rocket is initially pushed off a 40.0 m high wall with a horizontal speed of 0.630 m/s and experiences a constant horizontal thrust of 24.1 N. Calculate the time it takes for the rocket to fall 40.0 m using the vertical motion equations, which is independent of horizontal motion. Then, determine the horizontal distance traveled during that time by incorporating the initial speed and the additional acceleration from the thrust. This approach will yield the total distance from the base of the wall where the rocket lands.
aisha001
Messages
1
Reaction score
0

Homework Statement



A 507.0 g model rocket is resting horizontally at the top edge of a 40.0 m high wall when it is accidentally bumped. The bump pushes it off the edge with a horizontal speed of 0.630 m/s and at the same time causes the engine to ignite. When the engine fires, it exerts a constant 24.1 N horizontal thrust away from the wall. How far from the base of the wall does the rocket land?

I don't know where to start - I am not asking for the answer, just some direction on where to start...

If anyone could help me on this, it would be fantastic. I am pretty much stumped! Thanks!
 
Last edited:
Physics news on Phys.org
well being a rocket nut I can't resist, but at the same time the problem is poorly stated IMO. I'm assuming the rocket engine is firing horizontal/edit never mind missed that part.

(However that will not remain so, as the rocket "weathercocks" so the nose is pointed increasingly downward, but I doubt that is intended for consideration)

so set up two velocities as a function of time: one in the x direction, given the initial velocity plus that acceleration privided by the motor and the other in the y. You can figure the time it hits the ground from the latter, ie a bullet shot horizontally from a rifle in theory should hit the ground at the same time as a bullet simply dropped from the height of the barrel. Does that help a little?
John S
 
Last edited:
How would you solve this if there was no rocket acceleration in the x?
 

Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
View full post »
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

Projectile Motion -- Help please understanding these basic problems
Replies
4
Views
1K
Optimal Angle and Horizontal Range of a Bottle Rocket Projectile
Replies
1
Views
3K
What Are the Optimal Launch Angles for a Projectile to Pass Through an Opening?
Replies
25
Views
3K
Projectile Motion -- position and the highest point
Replies
8
Views
2K
Projectile motion above ground given only angle and height
Replies
3
Views
2K
Conceptual Question on Projectile Motion
Replies
2
Views
3K
A rocket on a cart is fired to go through a hoop
Replies
1
Views
2K
Assumption about Projectile Motion in this Question
Replies
24
Views
3K
Finding the final y-position of a projectile
Replies
8
Views
3K
Projectile motion collisions problem
Replies
19
Views
2K

Hot Threads

Recent Insights

Back
Top