1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
NeTakaya
2 years ago
12

A 72-kg man stands on a spring scale in an elevator. Starting from rest, the elevator ascends, attaining its maximum speed of 1.

2 m/s in 0.80 s. The elevator travels with this constant speed for 5.0 s, undergoes a uniform negative acceleration for 1.5 s, and then comes to rest. What does the spring scale register During the first 0.80s of the elevator’s ascent?
Physics
1 answer:
Shalnov [3]2 years ago
3 0

Answer:

Explanation:

During the first .8 s , the elevator is under acceleration . It starts from initial velocity u = 0 , final velocity v = 1.2 m /s , time = .8 s

v = u + at

1.2 = 0 +  .8 a

a = 1.2 / .8

= 1.5 m /s²

During the acceleration in upward direction , let reaction force of ground on man be R .

Net force on man = R - mg

Applying Newton's 2 nd law

R - mg = ma

R = m ( g + a )

= 72 ( 9.8 + 1.5 )

= 813.6 N .

This reaction force will be measured by spring scale , so reading of spring scale will be 813.6 N .

You might be interested in
Energy can be stored in a magnetic field. True or false?
Rzqust [24]

Your answer is here!

Yes It is true

8 0
3 years ago
Read 2 more answers
Which electromagnetic wave would have a wavelength approximately the size of the tip of a pencil?
marysya [2.9K]

Answer:

That's simply because any electromagnetic wave longer than a microwave is called a radio wave. Microwaves: Obviously used for cooking in microwave ovens, but also for transmitting information in radar equipment. Microwaves are like short-wavelength radio waves. Typical size: 15cm (the length of a pencil).

3 0
3 years ago
What type of energy does a stove use to convert into heat
sasho [114]
This Is What I Found<span>(Non-electric stoves and ovens use gas energy, a chemical energy. This is then transformed into heat.) What types of energy does a computer convert electricity into? (Light, sound, motion, and heat.)    I'm Not Taking Credit For It, Because I Didn't Come Up With That Answer.</span>
4 0
3 years ago
Read 2 more answers
Which dartboard represents high accuracy and low precision?
Virty [35]
Dart board 3 represents high accuracy but low precision
8 0
3 years ago
Anger is to angry as fire is to what
finlep [7]
<span>Anger is to angry as fire is to blazing. </span>
4 0
2 years ago
Other questions:
  • What are two real life examples that resemble peristalsis?
    9·1 answer
  • What is the value of the temperature 15 degrees Celsius in degrees Kelvin?
    11·1 answer
  • A student is examining a bacterium under the microscope. The E. coli bacterial cell has a mass of m = 0.200 fg (where a femtogra
    13·1 answer
  • What is the S.I. unit of drift velocity and electron mobility?
    9·1 answer
  • Help!! Urgent!! What property determines the sequence of layers in the earth?
    6·1 answer
  • In the simulation, both elastic and inelastic collisions take the same amount of time. In which type of collision is the acceler
    9·1 answer
  • A 30,000-kg freight car is coasting at 0.850 m/s with negligible friction under a hopper that dumps 110,000 kg of scrap metal in
    10·1 answer
  • A boat travels at 15 m/s in a direction 45° east of north for an hour. The boat then turns and travels at 18 m/s in a direction
    10·1 answer
  • True or False: Warm air has greater air pressure than cool air 21 points
    6·2 answers
  • Two planes fly in opposite directions. One travels 450 mi/h and the other flies 550 mi/h. How long will it take before they are
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!