Need to calculate work from mass and two velocities

  • Thread starter Thread starter kylepetten
  • Start date Start date
  • Tags Tags
    Mass Work
AI Thread Summary
To calculate the work done when a 1150 kg car accelerates from 2 m/s to 6 m/s, the change in kinetic energy (KE) is used. The formula for work done is Work = 0.5 * mass * (final velocity^2 - initial velocity^2). Applying the values, Work = 0.5 * 1150 * (6^2 - 2^2) results in the total work done. The initial confusion about insufficient information was resolved with this calculation approach. Understanding the relationship between work and kinetic energy is crucial for solving similar problems.
kylepetten
Messages
25
Reaction score
0

Homework Statement



Calculate how much work is done when a 1150 kg car accelerates from 2 m/s to 6m/s

Homework Equations


The Attempt at a Solution



I have no idea. It seems like insufficient information to me. Please help! I am in great need as my exam is drawing near!

Thanks!
 
Physics news on Phys.org
kylepetten said:

Homework Statement



Calculate how much work is done when a 1150 kg car accelerates from 2 m/s to 6m/s

Homework Equations





The Attempt at a Solution



I have no idea. It seems like insufficient information to me. Please help! I am in great need as my exam is drawing near!

Thanks!

Work done=change in KE=0.5*1150(6^2-3^2)
 
inky said:
Work done=change in KE=0.5*1150(6^2-3^2)

oh, man, i sure was thinking too hard. thank you very very much! well appreciated!
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
Thread 'Voltmeter readings for this circuit with switches'
TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance) My thoughts for the first case , one of them must be 12 volt while the other is 0 The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
Thread 'Trying to understand the logic behind adding vectors with an angle between them'
My initial calculation was to subtract V1 from V2 to show that from the perspective of the second aircraft the first one is -300km/h. So i checked with ChatGPT and it said I cant just subtract them because I have an angle between them. So I dont understand the reasoning of it. Like why should a velocity be dependent on an angle? I was thinking about how it would look like if the planes where parallel to each other, and then how it look like if one is turning away and I dont see it. Since...
Back
Top