# Physics

74.0-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is

(a) accelerating upward with an acceleration of 1.10 m/s2,

(b) moving upward at a constant speed, and

(c) accelerating downward with an acceleration of 1.00 m/s2?

1. 👍 0
2. 👎 0
3. 👁 57
1. (a) accelerating upward with an acceleration of 1.10 m/s2,
F(net) = F(up) + F(down)
ma = Fup + Fg
(74.0kg)(1.10m/s^2) = Fup + (74.0kg)(-9.8m/s^2)
Find Fup to get the scale reading
(The scale reading is the value of the upward force of the spring inside the scale)
(b) moving upward at a constant speed,
F(net) = F(up) + F(down)
0 = F(up) + F(down)
F(up) = -F(down)
(c) accelerating downward with an acceleration of 1.00 m/s2
(74.0kg)(-1.00m/s^2) = Fup + (74.0kg)(-9.8m/s^2)
Find F(up)

1. 👍 0
2. 👎 0
posted by GK

## Similar Questions

1. ### physics

an 800 N person stands on a scale in an elevator. What is his apparent weight when the elevator is accelerating upward at 2 m/s^2? B) what5 is his apparent weight when the elevator is acc. downward at 2m/s^2? c) what is his

asked by Sabrina on February 20, 2007
2. ### Physics

A 83.0-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.80 m/s2

asked by Xavier on October 3, 2010
3. ### 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

asked by Hadi on November 14, 2006
4. ### 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

asked by Christina on November 16, 2006
5. ### physics

A person stands on a bathroom scale on a motionless elevator. When the elevator begins to move, the scale briefly reads 200 percent of the person's regular weight. Calculate the acceleration of the elevator, a_{elevator}. Use SI

asked by Ryan on February 21, 2014
6. ### Physics

A 96.4-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.86 m/s2, (b) moving upward at a constant speed

asked by BrookeNeed on September 29, 2016
7. ### Physics Dynamics

A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.69 of the person's regular weight. Calculate the magnitude of the acceleration of the elevator.

asked by Anonymous on February 12, 2015
8. ### Phys

A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.74 of the person's regular weight. Calculate the magnitude of acceleration of the elevator. Find the

asked by Ashley on September 23, 2009
9. ### physics

A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.71 of the person's regular weight. Calculate the acceleration of the elevator, and find the direction

asked by Meghan on November 14, 2010
10. ### Physics

A person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 591 N. As the elevator later stops, the scale reading is 391 N. Assume the magnitude of the acceleration is the same during

asked by Jazz on October 9, 2006
11. ### Physics

Chapter 4, Problem 36 Incorrect. A 77.2-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.66 m/s2, (b) moving upward at a constant speed,

asked by shine on December 12, 2012

More Similar Questions