Calculating Work and Power: Solving a Tractor Pull Problem

  • Thread starter Thread starter bob24
  • Start date Start date
  • Tags Tags
    Power Work
AI Thread Summary
A tractor pulls a wagon with a constant force of 700N at a speed of 20.0 km/h. To calculate the work done by the tractor in 3.5 minutes, the relevant equations are P=W/t or P=Fv. The correct work done is 8.16 x 10^6 J, and the power output is 3888.8 watts. The user initially struggled with the calculations but realized the need to convert km/h to m/s for accuracy. The discussion highlights the importance of unit conversion in solving physics problems.
bob24
Messages
14
Reaction score
0

Homework Statement



A tractor pulls a wagon with a constant force of 700N at a constant speed of 20.0 km/h.
a) How much work is done by the tractor in 3.5min
b) What is the tractor's power output?
ANSWERS: a)8.16 x 10^6 J//b) 3888.8 watts
2. Relevant equation
P=W/t or P=Fv



The Attempt at a Solution


P=Fv
P=700N x 20.0
P=14000J

Pt=W
14000W x 210seconds=W
W=2940000J

I've been trying for over an hour now and I just can't get the answer. Any help will be greatly appreciated.
 
Physics news on Phys.org
Convert km/h to m/s.
 
rl.bhat said:
Convert km/h to m/s.

I realized it about 5 seconds before you posted haha. Thank you very much!
 

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 can power and work be calculated using friction and known mass and distance?
Replies
8
Views
8K
Motion in 1-D Problem: Tractor vs Tesla Collision Calculation
Replies
1
Views
1K
Avg Power in a Rotational Energy/Work Problem
Replies
6
Views
1K
What is the power input of a motor pulling up an elevator?
Replies
3
Views
3K
What is the Power Output of Gravity?
Replies
6
Views
2K
Will the Tractor and Tesla Avoid a Collision on the Mountain Road?
3
Replies
100
Views
10K
Power calculations of AC signal
Replies
1
Views
2K
How Do You Calculate Power in These Physics Problems?
Replies
5
Views
1K
How do I calculate the magnitude of initial acceleration?
Replies
9
Views
6K
Maximizing Range/Time in Air of an Airplane: Solving with Calculus
Replies
4
Views
2K

Hot Threads

Recent Insights

Back
Top