Re: HELP!!!

From: operator jay (none_at_none.none)
Date: 10/23/04 

Date: Sat, 23 Oct 2004 00:27:31 -0500

"Jittanonta" <Jittanonta@gmail.com> wrote in message
news:f1e6709.0410221235.19083eb4@posting.google.com...
> Dear all,
>
> I'm asking for a little bit of help from those of you who love
> physics. I need 3 physics questions and a method of solving them. 1
> question on motion, 1 question on force, and finally 1 question on
> energy. Would anyone kindly give me some of these questions with the
> detail working. These questions are for me to practice for my
mid-term
> exam that's coming in about 2 days. please kindly write the detail
> working for each questions. In addition, the answers to these
> questions should be able to derived without using a calculator
>
> Thank you very much
>
> AJ

1. An object is seen to move a distance of 10m in a Northerly
direction in 2s. It moves with uniform speed. What is its
velocity?

v = change in position / change in time
v = 10 / 2
v = 5 m/s [North]

2. The object has mass M. What force is being applied to it (assume
no friction, etc.)?

F = mass * acceleration
F = M * a
F = M * 0 (it moves at constant speed)
F = 0 N

3. How much energy is used in moving the object through the 10m
distance?

W = force * distance
W = F * d
W = 0 * 10
W = 0 J

There you go. A comprehensive set of problems, to be sure. Don't
forget your units.

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