Homework Help: physics

Posted by kriti on Sunday, March 20, 2011 at 1:05am.

A 680 newton student runs up a flight of stairs 3.5 m high in 11.4 seconds. The student takese 8.5 seconds to run up the same flight of stairs during a second trial.

1)Find the work done by the 680 N student in climbing the stairs

2) Determine the power developed by the student during the 11.4 second climb.

3. Write 1-2 sentences: Compare the power developed by the student climbing the stairs in 11.4 seconds to the power developed during the 8.5 second trial.

I need help setting up the problem in 1 and 2. #3 I don't understand what is wanted for the comparison.

physics - Damon, Sunday, March 20, 2011 at 5:24am
work done = 680*3.5 Joules

first time:
power = work/time = 680*3.5/11.4 Watts

second time:
power = 680*3.5/8.5

Answer this Question

Related Questions

energy - A boy weighing 350Newton runs up a flight of stairs consisting of 20 ...
physics - a boy weighing 350N runs up a flight of stairs consisting of 20 steps ...
Physics - A student, late for class, ran up some stairs between landings. The ...
physics - a 70.o kg student runs up a 5.00 meter high stairway in a time of 5 ...
physics - jeritex mass is 60kg. if he climbs up the flight of stairs 13 meters ...
physics - a boy who can generate 500 w runs up a flight of stairs in 5.0 s.how ...
physics - In a time of 10s, a 70 kg student runs up 2 flights of stairs whose ...
physics - a 50 kg student who is late runs up two flights of stairs whose ...
Algebra 2 - If Graham runs up 6 steps of the escalator, then it takes him 46.5 ...
PHYSICS - Gerry, who weighs 500 newtons, is late for class. It takes her 7.5 ...

For Further Reading

First Name:
School Subject:
Answer: