76 776
Assignments Done
Successfully Done
In June 2019

Answer to Question #25365 in Mechanics | Relativity for Karthi

Question #25365
How do i do this question. A weightlifter lifts a 32 kg set of weights from ground level to position over the head. The vertical lift is 2.2 m. How much work does the weightlifter do
Expert's answer
Let's write the law conservation of energy(the work which the weightlifter do will equal to difference between initial and final potential energies):
A = U2 - U1
A - work which the weightlifter do,
U1, U2 - initial and final potential energies
U = mgh - the definition of the potential energy
m - mass
g - gravitational acceleration
h - high
At the beginning, the weightlifter was staying on the ground, so h=0.
A = mgh - mg*0 = mgh
A = 32*2.2*9.8 = 689.92 J
Answer: 689.92 J

Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!


No comments. Be first!

Leave a comment

Ask Your question

Privacy policy Terms and Conditions