# Physics

posted by .

An 80 kg man is riding in an elevator from the first floor to the 34th floor. The elevator and man are moving at a constant speed. What is the net force on the man in Newtons
(g=9.8)

• Physics -

Net force (N) = Mass(kg)* g(m/s^2)
= 80*9.8 = ___ N

It doesn't matter what floor he is on.
The constant speed does matter.

• Physics -

• Physics -

Net force is in fact equal to weight for constant speed.

Maybe the idiot computer grader is using something else besides 9.8m/s^2 for the acceleration of gravity.

• Physics -

Could be the idiot computer grader is using 80, and 9.8 as significant digits.

in the 80, it is one sig digit, two in 9.8

Technially, with that, the answer cannot be more than one sig digit, answer= 800
if you do two sig digits (ignoring the 80), then the answer is 780

but in any rate, it is important for you to know the force at constant speed is mg

• Physics -

• Physics -

absolutely the answer is zero. note the question it says net force .

## Similar Questions

1. ### Physics

A man in an elevator is 79kg. The elevator itself is 860kg. As the elevator begins to move down, a scale the man is standing on reads 437N. How do I determine the acceleration of the elevator?
2. ### physics....need help!

An 80 kg man is riding in an elevator from the first floor to the 34th floor. The elevator and man are moving at a constant speed. What is the net force on the man in Newtons.
3. ### engineering physical

An elevator with a man inside, of gross mass 500KG, starts moving upwards with a costant acceleration and acquires a velocity os 2m/s after travelling a distance os 3m.Find the pull in the cables during the accelerated motion. If the …
4. ### Collage Physics

n elevator with a man inside, of gross mass 500KG, starts moving upwards with a costant acceleration and acquires a velocity os 2m/s after travelling a distance os 3m.Find the pull in the cables during the accelerated motion. If the …
5. ### Collage Physics

An elevator with a man inside, of gross mass 500KG, starts moving upwards with a costant acceleration and acquires a velocity os 2m/s after travelling a distance os 3m.Find the pull in the cables during the accelerated motion. If the …
6. ### PHYSICS!!!!

An 80 kg man is riding in an elevator from the first floor to the 34th floor. The elevator and man are moving at a constant speed. What is the net force on the man in Newtons.
7. ### Physics (A man in the lift)

A man of mass m is standing in an elevator. The elevator is accelerating downward at g/k, where k>1 and g is the gravitation acceleration. If the force on the man by the elevator's floof jmg, where j is a constant and k= a/(b+cj), …
8. ### Physics

An 80 kg man stands in an elevator. What force does the floor of the elevator exert on the man if a) the elevator is stationary?
9. ### Physics

An 80 kg man stands in an elevator. What force does the floor of the elevator exert on the man if a) the elevator is stationary?
10. ### Physics

An 80 kg man stands in an elevator. What force does the floor of the elevator exert on the man if a) the elevator is stationary?

More Similar Questions