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
Oliga [24]
3 years ago
14

A student, who weighs 720N, is standing on a bathroom scale and riding an elevator that is moving downwards with a speed that is

decreasing at a rate of 3.1m/s2.
What is the student's mass?
What is the net force on the student?
What value does the scale read?
Physics
1 answer:
jasenka [17]3 years ago
3 0

Answer:

1) The mass of the student is approximately 73.39 kg

2) The net force on the student is approximately 947.523 N

3) The value the scale will read is approximately 96.59 kg

Explanation:

The given parameters are;

The weight of the student = 720 N

The speed at which the elevator is decreasing = 3.1 m/s²

1) The weight of the student = The mass of the student × The acceleration due to gravity

The acceleration due to gravity is a constant = 9.81 m/s²

Substituting the known values gives;

720 N = The mass of the student × 9.81 m/s²

∴ The mass of the student = 720 N/(9.81 m/s²) ≈ 73.39 kg

2) The forces acting on the student are;

i) The force of gravity which is the weight of the student acting downwards

ii) The inertia force of the slowing elevator acting downwards in the same direction as the weight of the student

The net force, F_{net} = The weight of the student + The inertia force of the slowing elevator

∴ The net force, F_{net} = 720 N + 73.39 kg × 3.1 m/s² ≈ 947.523 N

3) The scale will read the mass of the student as follows;

Mass reading of student on the scale = Force on scale/9.81

∴ Mass reading of student on the scale = 947.523/9.81 ≈ 96.59 kg

The value the scale will read = 96.59 kg.

You might be interested in
Convert 70 mi/h to m/s. 1 mi = 1609 m.<br><br> Answer in units of m/s.<br><br> Plz help me now
melisa1 [442]

Answer:

70mi/h

1mile =1609 meters

1hour=3600 seconds

So,

70×1609/3600

112,630/3600

31.286 m/s

Hope this helps you

6 0
3 years ago
What are the factor that affect gravity​
valentinak56 [21]

Explanation:

The factors that affect gravity are as follows:

1. mass of body

2. acceleration

<em>Keep</em><em> </em><em>smiling </em><em>and</em><em> </em><em>hope</em><em> </em><em>u</em><em> </em><em>are</em><em> </em><em>satisfied</em><em> </em><em>with</em><em> </em><em>my</em><em> </em><em>answer</em><em>.</em><em>Have</em><em> </em><em>a</em><em> </em><em>good</em><em> </em><em>day</em><em> </em><em>:</em><em>)</em>

6 0
3 years ago
A sound wave in the air has a frequency of 256 hertz and is traveling at a speed of 331 meters/second. What is its wavelength?
nikdorinn [45]
2.39 is the answer cuh
6 0
3 years ago
Read 2 more answers
What happens to a bowl of hot soup when it is placed into a freezer where the air Temperature is below freezing. How does this a
Artyom0805 [142]
It does not it when put in the freezer it freezes the steam
8 0
3 years ago
A raccoon falls out of a tree from a height of 1.2. Which equation can you use to calculate the time it takes for the raccoon to
Inga [223]

Answer:

t=\sqrt{\frac{2S}{g}}=\sqrt{\frac{2 \cdot 1.2 m}{9.81 m/s^2}}=0.50 s

Explanation:

The equation that we can use to calculate the time it takes for the raccoon to fall to the ground is:

t=\frac{2S}{g}

where S=1.2 m is the height of the tree and g=9.81 m/s^2 is the acceleration due to gravity. This equation is derived from the equation of the distance in a uniformly accelerated motion, which is given by

S=S_0 + v_0 t + \frac{1}{2}at^2

where S0 is the initial position, v0 is the initial velocity and t the time. In this problem, we can put S0=0 (we can take the initial position as the initial position of the raccoon) and v0=0 (the raccoon starts from rest), so the equation becomes

S=\frac{1}{2}at^2

and since the motion is a free fall, the acceleration is equal to the acceleration of gravity, so a=g:

S=\frac{1}{2}gt^2

And by re-arranging it, we find

t=\sqrt{\frac{2S}{g}}

By substituting numbers, we find

t=\sqrt{\frac{2S}{g}}=\sqrt{\frac{2 \cdot 1.2 m}{9.81 m/s^2}}=0.50 s

3 0
3 years ago
Other questions:
  • If you have 80g of a radioactive substance whose half life is 2 days, how long will it take for the substance to decay to the po
    14·1 answer
  • Two cellists, one seated directly behind the other in an orchestra, play the same 220-Hz note for the conductor who is directly
    5·1 answer
  • What is gravitational force
    13·2 answers
  • What are all the stars made up of?
    13·1 answer
  • Which statement explains how weight is different from mass?
    12·2 answers
  • The sum of kinetic energy and potential energy within a system is called
    7·2 answers
  • Assuming that 1.0g of aspirin dissolves in 450 mL of water at 10o C, how much aspirin would be lost in the 1.4 mL of water added
    14·1 answer
  • A roller coaster car moving at a velocity of 30 meters/second has a momentum of 2.5 _ 104 kilogram meters/second. What is its ma
    15·1 answer
  • A car travels 300km in six hour. What is the average speed
    13·1 answer
  • How does a plane mirror work
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!