Express your answer in Watts and horsepower

  • Thread starter Thread starter Weezergames
  • Start date Start date
  • Tags Tags
    Horsepower Watts
AI Thread Summary
To calculate the power output of a bodybuilder lifting 150kg to a height of 2.2m in 1.3 seconds, first determine the work done using the formula Work = mass × gravity × height. The gravitational force is approximately 9.81 m/s², so the work done is 150kg × 9.81 m/s² × 2.2m. Power is calculated as Work divided by time, yielding the result in Watts. Finally, convert Watts to horsepower using the conversion factor of 1hp = 746w for the final answer.
Weezergames
Messages
4
Reaction score
0

Homework Statement


What is the power output of a bodybuilder who raises 150kg from the ground to a height of 2.2m in 1.3 seconds? Express your answer in Watts and Horsepower (1hp=746w)


Homework Equations



show me how to do this problem

The Attempt at a Solution



show me how to do this problem
 
Physics news on Phys.org
You are supposed to be a bit more enterprising than this!
Find out what work is.
Find out what power is.
Then make a stab at the answer.
 
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...
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...
Back
Top