What impulse is needed to change the speed of a 16 kg object

AI Thread Summary
To change the speed of a 16 kg object from 14 m/s to 26 m/s in 5 seconds, the required impulse is calculated as 192 kg·m/s. This results in a force of 38.4 N when divided by the time interval. There is confusion regarding the direction of the impulse, as impulse is a vector quantity while speed is a scalar. Some participants question whether the initial and final speeds were correctly interpreted in the problem. The discussion highlights the importance of clarity in the problem statement to avoid miscalculations.
Dil
Messages
3
Reaction score
0
This question is infuriating me. It says the answer is 32, but I can't get that.
--------------------------------------------------------------------
What impulse is needed to change the speed of a 16 kg object from 14 m/s to 26 m/s in a time of 5s? How much force is needed?

mVf - mVi
(16)(26)-(16)(14) = 192

F(change in 5s)=192 192/5 = 38.4N
--------------------------------------------------------------------

What am I doing wrong?
 
Physics news on Phys.org
Impulse is a vector quantity and speed a scalar. Is the direction changing pls see it
 
I don't think the direction is changing
 
Perhaps the given answer is wrong... It sure looks wrong to me!
 
Yes to me it 2 seems to be on wrong side
thats why i asked for direction
 
You sure it's not 16 to 26 m/s or 14 to 24 m/s?
 

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 Does Impulse Relate to Momentum Change in Physics Problems?
Replies
7
Views
2K
Work done during a collision -- Change in Kinetic Energy & change in Momentum
Replies
1
Views
2K
Calculating Velocity After Impulse | Momentum and Impulse Homework Help
Replies
2
Views
1K
How Is Impulse Calculated in Baseball Physics?
Replies
5
Views
2K
A misconception I have about impulse formula interpretation
Replies
2
Views
2K
Impulse Question -- A car changing speed and direction
Replies
7
Views
2K
Momentum and impulse of a football
Replies
2
Views
2K
Calculate change in KE and momentum (impulse)
Replies
7
Views
3K
Calculating momentum of soccer ball.
Replies
6
Views
6K
Golf club 🏌️and ball ⛳ impulse problem
Replies
19
Views
2K

Hot Threads

Recent Insights

Back
Top