Solve Kinematics in 2D: Rocket Clears 11m Wall

  • Thread starter Thread starter Cheddar
  • Start date Start date
  • Tags Tags
    Kinematics
AI Thread Summary
A rocket is launched at 75 m/s at a 60-degree angle, aiming to clear an 11-meter-high wall located 27 meters away. To determine how much the rocket clears the wall, the vertical and horizontal displacements must be calculated using kinematic equations. The initial vertical position and the time of flight to reach the wall are critical for finding the rocket's height at that distance. The final height can be compared to the wall's height to determine the clearance. The calculations focus on relating vertical and horizontal displacements to solve the problem accurately.
Cheddar
Messages
38
Reaction score
0

Homework Statement


A rocket is fired at a speed of 75m/s from ground level, at an angle of 60degrees above the horizontal. The rocket is fired toward an 11-m-high wall, which is located 27m away. By how much does the rocket clear the top of the wall?

Homework Equations


final velocity = initial velocity + (acceleration * time)
displacement = (initial velocity * time) + 1/2 * acceleration(gravity) * time(squared)


The Attempt at a Solution


So, I need to find the final position where the rocket will land and the time it takes to do so.
If final velocity = 0 then I think I can go from there. I just don't know if that would be right.
 
Physics news on Phys.org
I think you'd need to find how high the rocket is at 27m away. Then if that is bigger than 11m, you would subtract 11 from the value you got.

so you need to find an equation relating vertical displacement (y) and horizontal displacement(x)
 
Got it. Thank you.
 
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...
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}...
Back
Top