How much work? Given speeds and mass

  • Thread starter Thread starter ital_dj
  • Start date Start date
  • Tags Tags
    Mass Work
AI Thread Summary
The discussion focuses on calculating the work done by an Olympic triathlete accelerating from 5 m/s to 10 m/s on a bicycle with a total mass of 105 kg. The key equation for work is identified as W = Fd, where force is derived from mass and acceleration. Participants clarify that gravitational energy is not a factor in this scenario, prompting a focus on kinetic energy changes. The solution involves calculating the difference in kinetic energy, using the formula W = ΔKE, rather than solving for distance directly. The final takeaway is that work can be determined by subtracting the initial kinetic energy from the final kinetic energy.
ital_dj
Messages
31
Reaction score
0

Homework Statement


How much work is done by an Olympic triathlete who accelerates herself on her bicycle (combined mass of 105kg) from 5m/s to 10m/s


Homework Equations


W = mg\Deltad


The Attempt at a Solution


Tried solving for d, and plugging in.
 
Physics news on Phys.org
Your equation would apply if there was gravitational energy involved, but in this question there isn't. Work here is defined as W = Fd where F = ma.
 
But still, how would I solve for d?
 
Use kinematics to solve for a and d simultaneously.
 
W = delta(KE)

All you need to do is subtract her final kinetic energy from her initial kinetic energy to find the answer.
 
Thread 'Voltmeter readings for this circuit with switches'

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...
View full post »
Thread 'Struggling to make relation between elastic force and height'

Thread 'Struggling to make relation between elastic force and height'

Hello guys this is what I tried so far. I used the UTS to calculate the force it needs when the rope tears. My idea was to make a relationship/ function that would give me the force depending on height. Yeah i couldnt find a way to solve it. I also thought about how I could use hooks law (how it was given to me in my script) with the thought of instead of having two part of a rope id have one singular rope from the middle to the top where I could find the difference in height. But the...
View full post »

Similar threads

Misunderstanding Work-energy theorem and center of mass properties
Replies
7
Views
2K
Solving for Work Done When Accelerating a Mass
Replies
3
Views
810
How Much Work Is Done by an Olympic Triathlete Accelerating on Her Bicycle?
Replies
2
Views
2K
How much work done by friction when a box w/apparent mass...?
Replies
4
Views
2K
Does the mass of an object affect its inertia?
Replies
6
Views
2K
Work Check - Centripetal force - Finding Tension in a Rope
Replies
8
Views
3K
Calculating Mass of Cannon Ball with Given Velocity Using Work-Energy Theorem
Replies
3
Views
1K
Work Done by Gravity and Tension in a Pulley System
Replies
3
Views
2K
Work and energy of an object on a ice slope
Replies
7
Views
1K
How to Determine the Work Done by the Rope on a Sledge?
Replies
5
Views
2K

Hot Threads

Recent Insights

Back
Top