Posted by Melissa on Wednesday, April 25, 2012 at 3:00pm.
A 60 kg student does 60 push ups in 40s . With each push up , the student must lift 70% of the body mass a height of 40cm off the floor. Assuming two significant digits, calculate the following
The work the student does against a force of gravity for each push up , assuming work is done only when the student pushes up
The total work done against the force of gravity in 40s
The power achieved for this period

physics  Dev, Wednesday, April 25, 2012 at 3:12pm
(60 kg)(9.8 m/S^2) = Force in Newton

physics  Damon, Wednesday, April 25, 2012 at 3:55pm
m g * .40 = 60 * 9.8 * .7 = 412 Newtons force
distance up = .40 meters
work per push up = .40*412 = 165 Joules per push up
total work = 165 * 60 = 9878 Joules
power = work/time = 9878/40 = 247 watts
Answer This Question
Related Questions
 physics/math  Joe is a former basketball player who is now a workout junkie, ...
 physics  The 80kg student balances a 1300kg elephant on a hydraulic lift. (U...
 Math  6, 7, 8, 9, 12, 13, 14, 16, 23, 23 A student did the following push ups ...
 math  Ali is planning to keep fit through practicing pushups for 21 days. on ...
 Personal fitness  2._____ training must target the muscle group that is needed ...
 physics B  This is the first question on the 2003 ap physics b exam. I need ...
 physics  A person wants to push a lamp (mass 7.2 kg) across the floor, for ...
 physics  Two students on roller skates stand facetoface, then push each other ...
 Physics  Two students on roller skates stand facetoface, then push each other ...
 physics  A man doing pushups pauses in the position shown in the figure . His ...
More Related Questions