Pilot averages 190W over distance. Mass, time, power given. find H

  • Thread starter Thread starter lolbob07
  • Start date Start date
  • Tags Tags
    Mass Power Time
AI Thread Summary
The discussion revolves around calculating the height a pilot can lift a mass using the power generated while pedaling. The pilot averages 190 watts over 25 seconds, and the mass to be lifted is 110 kg. To find the height, the work done by the pilot must first be calculated using the formula W = P x T, which gives a total work of 4750 joules. The force exerted is calculated using F = mg, resulting in 1078 N. The height can then be determined using the rearranged work formula W = mgh, leading to the final calculation of height.
lolbob07
Messages
13
Reaction score
0

Homework Statement


In 1979 the human powered Gossamer Albatross flew across the English Channel. The pedalling pilot averaged 190 W over the distance. If the pilot's power was used to lift a 110 kg mass, to what height would he lift the mass in a time of 25 s?


Homework Equations


P = W/T
W=FxD


The Attempt at a Solution


All I am looking for is the formula to solve this question.
P = 190 J/S
M = 110 kg
Time = 25 s

How to find the height?
 
Physics news on Phys.org
How much work would he have done during this period?
Lifting a mass up ... what happens to its energy?
 
andrevdh said:
How much work would he have done during this period?
Lifting a mass up ... what happens to its energy?

Work = F x D


F=mg
F=110 x 9.8
F=1078 N

But how do we find the distance?
 
190 W is a quantity of power. Check out the definition (and units) of power.
 
Use the power rating to calculate the amount of work that the pilot will do during the stated period of time.
 
Instead of W=FD think about W=mgh
 

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 many crates can you load in a minute with different average power outputs?
Replies
1
Views
2K
Momentum: instantaneous or average?
Replies
9
Views
1K
What is the Power Output of Gravity?
Replies
6
Views
2K
Worksheet Problem about Power (average power of a car accelerating up a hill)
Replies
2
Views
2K
Calculate Avg Power Output for 75kg Person Walking 100ft in 3min
Replies
9
Views
2K
How Do You Calculate Race Car Acceleration and Power Output?
Replies
20
Views
2K
A Physics 11 Elevator Work/Power Problem
Replies
3
Views
4K
Find Minimum Height to Lift 4kg Mass with 0.1kg Block & Pulley
Replies
9
Views
3K
Determining power output at different time intervals
Replies
4
Views
2K
What Is the Average Power of Bullets Bouncing Off Superman?
Replies
26
Views
3K

Hot Threads

Recent Insights

Back
Top