By JUST looking; no asking. Any ways to tell?
2007-02-21 12:45:13 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Physics
To start out you are going to have to make some assumptions.
Namely your classmates backpack has the same density of materials as your backpack.
With that knowledge in hand find an approximate volume of your backpack. A rectangular box should do. Volume = width*length*height.
Now weigh your backpack.
Divide the weight by the volume to get a ratio of weight to volume. Now observe your classmate's backpack and get a good guess at the volume. Multiply that number by your ratio and there you go you have about as good a guess as can be made given the circumstances.
2007-02-21 12:52:56 · answer #1 · answered by uahgrad05 3 · 0⤊ 0⤋
The center of mass of your classmate and backpack have to be over the feet. The heavier the backpack, the more adjustment in body angle necessary. Still some guessing required but this should help.
2007-02-21 21:13:20 · answer #2 · answered by sojsail 7 · 0⤊ 0⤋
by making use of the principle of momentum. observe how easy or hard it is for him to move around with his backpack on his back. and also how his body reacts to the backpack's movement.
another is by observing how the lower part of the bag takes the shape of the things inside it.
2007-02-22 10:07:58 · answer #3 · answered by kcarter 2 · 0⤊ 0⤋
Reconsider the possibility of weighing it.
2007-02-21 20:48:21 · answer #4 · answered by Beejee 6 · 0⤊ 0⤋
first of all, this is a weird question...weigh yours, then try to tell how many of his would fit in yours...that is all i could think of...but why do u care??
2007-02-21 20:48:42 · answer #5 · answered by sockerchicka 3 · 0⤊ 0⤋
Not really...you'd have to know what was inside of it first.
2007-02-21 20:48:47 · answer #6 · answered by hummingbird684 1 · 0⤊ 0⤋
look at the size... estimate?
hows it possible really?
2007-02-21 20:48:08 · answer #7 · answered by Structure 5 · 0⤊ 0⤋