2007-01-30 23:16:54 · 7 answers · asked by search2seek 1 in Science & Mathematics ➔ Physics
where do you put the scale? If a person falls off a plane, he needs a parachute, not a scale eh!
2007-01-30 23:24:40 · answer #1 · answered by gabnella 6 · 0⤊ 1⤋
First which quantity does 180 represent? Where are the units? Is it Newtons or kgs?
Anyway.
Because the object is in free fall then it is important to distinguish between true weight and apparent weight.
True weight, w, is 180 N (assuming that's what the number 180 represents).
The true weight is given by the formula:
w=mg
Where:
m= mass
g= free fall acceleration
The above definition is always true.
The size of the true weight does not change!
(It only varies if the value of free fall acceleration changes).
Apparent weight is what you would measure on a weighing scale.
It is equal in magnitude to the normal force on the scale.
In free fall there is no normal force.
Thus the apparent weight in this situation is 0 N.
Lastly, the mass does not change. The mass is 180kg (assuming that's what the number 180 represents).
It is not zero as some have said.
2007-01-31 07:58:51 · answer #2 · answered by robbob 5 · 0⤊ 1⤋
You didn't tell us what the wind resistance of the scales are. The airflow would cause some decelerating force. Also, the airflow would direct the air around the person so reducing the effect of wind resistance on her (has to be a her, no guy needs to know his weight all the time) so there would be a small difference in the force on scales and the person. Maybe 20 or 30 of your dimensionless units. You didn't mention the units. If that is kilograms she sure needs to go on a diet.
2007-01-31 07:35:02 · answer #3 · answered by Anonymous · 0⤊ 1⤋
The weigt will vary +/- 180 kgs. as the machine is also falling with the person and not in a fixed position.
The gravitational force acts on both so there is no chance of any change in weight.
F=W
2007-01-31 07:32:10 · answer #4 · answered by Anonymous · 0⤊ 0⤋
He will apparently not weigh anything during his freefall .Weight of a body is due to the force with which earth's gravity attracts the person. But when an object is falling down, the acceleration due to gravity of 9.8 m/s2 has no influence. hence he weighs 0 kg.
2007-01-31 07:41:38 · answer #5 · answered by ? 5 · 0⤊ 1⤋
What will he weigh when his weight is 180?
He will weigh 180 when his weight is 180.
Good luck.
2007-01-31 08:01:48 · answer #6 · answered by Anonymous · 1⤊ 0⤋
0 kg
2007-01-31 07:23:27 · answer #7 · answered by giovaney 1 · 0⤊ 0⤋