Homework Help: PHYSICS PLEASE HELP BILLY!!! there are about thr

Posted by billy on Monday, October 13, 2008 at 7:29pm.

A 10.2 kg crate is pulled up a rough incline
with an initial speed of 1.5 m/s. The pulling
force is 123.0 N parallel to the incline, which
makes an angle of 14.6◦ with the horizontal.
The coecient of kinetic friction is 0.39 and
the crate is pulled a distance of 8.1 m.
The acceleration of gravity is 9.81 m/s2 .

a) Find the work done by Earth’s gravity
on the crate. Answer in units of J.

PHYSICS PLEASE HELP BILLY!!! there are about thr - drwls, Monday, October 13, 2008 at 7:43pm
You don't need to worry about friction to know how much work was done by, or against, gravity. It equals the change in potential energy, which is
M g * (change in elevation).
Put a minus sign in front of it to get the work done BY gravity.
The change in elevation is
H = 8.1 sin 14.6 meters

Answer this Question

Related Questions

Physics - A 10 kg crate is pulled up a rough incline with an initial speed of 1....
PHYSICS!! - A 10.2 kg crate is pulled up a rough incline with an initial speed ...
physics - A 10 kg crate is pulled up a rough incline with an initial speed of 1....
physics - A 10 kg crate is pulled up a rough incline with an initial speed of 1....
physics - A 14.7 kg crate is pulled up a rough incline with an initial speed of ...
Physics - Can anyone explain this to me, it was on my exam and i dont get it ; A...
physics - A large crate filled with physics laboratory equipment must be moved ...
Physics - A large crate filled with physics laboratory equipment must be moved ...
physics - a 250 kg crate is placed on an adjustable incline plane. If the crate ...
Physics - A 51-kg packing crate is pulled with constant speed across a rough ...

For Further Reading

First Name:
School Subject:
Answer: