Free help with homework

Why join Brainly?

  • ask questions about your assignment
  • get answers with explanations
  • find similar questions

1) A 90 kg woman stands in an elevator. Find the force which the floor of the elevator exerts on the woman a) when the elevator has an upward acceleration

of 2 m/sec2; b) when the elevator is rising at constant speed; c) when the elevator has a downward acceleration of 2 m/sec2.



This Is a Certified Answer

Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Let F be the force exerted by the floor of the lift on the woman.

The only two forces on the woman are  weight and the Force F.

 as per the Newtons law, the acceleration is equal to the net force on the object divided by its mass.

     F - m g = m a
     F = m (g + a)                Here , a is positive upwards.  F is positive upwards.

a)  a = 2 m/sec/sec
         F = 90 * ( 10 + 2) = 1080 N
b)  a = 0
       F = 90 * 10 = 900 N
     a = -2 m/sec/sec
 F = 90 * ( 10 - 2)  = 720 N

1 5 1
The Brain
  • The Brain
  • Helper
Not sure about the answer?
Learn more with Brainly!
Having trouble with your homework?
Get free help!
  • 80% of questions are answered in under 10 minutes
  • Answers come with explanations, so that you can learn
  • Answer quality is ensured by our experts