Projectile Launch Speed: Solve 876j Work Homework

  • Thread starter Thread starter Chica1975
  • Start date Start date
  • Tags Tags
    Projectiles Work
AI Thread Summary
To find the launch speed of a projectile given 876 joules of work on a 0.398 kg projectile, the work-energy principle can be applied, stating that work done is equal to the change in kinetic energy (W = ΔE). The gravitational force acting on the projectile is approximately 3.9004 N. The user is struggling with the calculations and has attempted to draw a diagram to visualize the problem. They acknowledge that the work done translates entirely into kinetic energy. Further assistance is requested to solve for the launch speed.
Chica1975
Messages
63
Reaction score
0

Homework Statement


A projectile launcher did 876j of work on a .398kg projectile what is the launch speed of the projectile?


Homework Equations


W = f*d
mg = 3.9004
after that I am stuck


The Attempt at a Solution



I drew a diagram and tried a few things but am completely stuck. please help.
 
Physics news on Phys.org
Chica1975 said:

The Attempt at a Solution



I drew a diagram and tried a few things but am completely stuck. please help.

The work done is entirely kinetic :wink:
 
thanks I will look it up and try again.
 
W = F * d is only a mathematical tool to calculate how much work is done. The applicable statement of physics is W = \DeltaE
 
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 »

Thread 'Egg Drop Challenge! Need ideas for winning designs'

I was thinking using 2 purple mattress samples, and taping them together, I do want other ideas though, the main guidelines are; Must have a volume LESS than 1600 cubic centimeters, and CAN'T exceed 25 cm in ANY direction. Must be LESS than 1 kg. NO parachutes. NO glue or Tape can touch the egg. MUST be able to take egg out in less than 1 minute. Grade A large eggs will be used.
View full post »

Similar threads

Launching a Projectile with Air Resistance
Replies
13
Views
3K
Projectile Motion on the Moon: Finding the Optimal Launch Angle Using Equations
Replies
2
Views
3K
Relationship between Launch height and range of a projectile
Replies
15
Views
25K
Calculating Launcher Mass from Projectile Acceleration
Replies
24
Views
4K
Calculate the displacement? (Projectile motion problem)
Replies
3
Views
2K
How Do You Solve a Projectile Motion Problem?
Replies
3
Views
4K
How Do Launch Angles Affect Projectile Energies and Impact Forces?
Replies
27
Views
3K
Find velocity with projectile and recoil accelerations
Replies
4
Views
2K
A plane, diving with constant speed at an angle of 53.0 degrees....
Replies
2
Views
3K
Projectile Motion: time it takes for projectile to hit truck
Replies
15
Views
3K

Hot Threads

Recent Insights

Back
Top