# physics

A 640 N student stands on a bathroom scale in an elebator. As the elevator starts moving, the scale reads 800 N. a) find the acceleration of the elevator (magnitude and direction) b) acceleration if the scale reads 450N? c) If the scale reads 0 should the student worry? Explain.

a) was 2.45m/s^3 up
b) -2.91m/s^2
c) free fall, and worry but I don't understand why.
What were the equations used?

apparent weight = mass*g + mass*acceleration.

When it goes up, apparent weight is greater, when it goes down, apparent weight is smaller, in free fall, a= g, so
apparent wegith= mg-mg=0

In the free fall, what forces are acting on the scale and the student? Answer, exactly the same force (gravity) is accelerating both at the same rate, there is no apparent difference in acclerations (forces) between them.

1. 👍 0
2. 👎 0
3. 👁 252

## Similar Questions

1. ### Physics

A 543-N physics student stands on a bathroom scale in an 805-kg (including the student) elevator that is supported by a cable. As the elevator starts moving, the scale reads 473 N A) Find the magnitude of the acceleration of the

asked by Mohamed on January 15, 2016
2. ### physics

Apparent Weight. A physics student weighing 600 N stands on a bathroom scale in an elevator. As the elevator starts moving, the scale reads 420 N . A )Find the magnitude of the acceleration of the elevator. B ) Find the direction

3. ### Physics

A 44.0 kg man stands on a bathroom scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.90 m/s in 1.19 s. It travels with this constant speed in the upward direction for the next 7.60 s.

asked by Elisabeth on September 9, 2011
4. ### physics

A 70kg man stands on a bathroom scale in an elevator. As the elevator starts moving, the scale reads 90kg Is the elevator acceleration up or down, is the elevator moving up or down?

asked by help on October 27, 2010
5. ### physics

A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 845 N. As the elevator moves up,the scale reading increases to 940N,then decreases back to 845N. The acceleration of

asked by alexa on July 12, 2011
6. ### Physics

A 650 N student stands on a scale in an elevator. As the elevator starts to move, the scale reads 780 N. a. Find tha acceleration. b. Is the elevator going up or down?

asked by Tomomi on December 4, 2011
7. ### Physics

A 42 kg man stands on a bathroom scale in an elevator. Starting from rest at the bottom floor, the elevator ascends, attaining its maximum speed of 1.95 m/s in 1.22 s. It travels with this constant speed for the next 7.80 s. The

asked by James on February 28, 2015
8. ### physics

A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 840 N. As the elevator moves up, the scale reading increases to 943 N, then decreases back to 840 N. The acceleration of

asked by luma on November 1, 2015
9. ### Physics

I just need help with part c. I know stopping takes longer but we have to explain why. A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 849 N. (a) As the elevator moves

asked by Sasha on January 5, 2010
10. ### Physics

I'm sorry this is kind of a long question. I've been staring at it for about an hour now and I have no clue where to even start. Thank you so much!!!! A student stands on a bathroom scale in an elevator at rest on the 64th floor

asked by Maya on June 7, 2016

More Similar Questions