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
Arada [10]
3 years ago
5

A book on a 2-meter high shelf has a mass of 0.4 kg. What is its potential energy?

Physics
2 answers:
poizon [28]3 years ago
6 0

Answer:

\boxed {\boxed {\sf 7.84 \ Joules}}

Explanation:

The formula for potential energy is:

PE=m*g*h

where <em>m </em>is the mass, <em>g</em> is the gravitational acceleration, and <em>h</em> is the height.

The mass of the book is 0.4 kilograms. The gravitational acceleration on Earth is 9.8 m/s². The height of the book is 2 meters.

m=0.4 \ kg \\g=9.8 \ m/s^2 \\h=2\ m

Substitute the values into the formula.

PE=(0.4 \ kg)(9.8 \ m/s^2)(2 \ m)

Multiply the first two numbers.

  • 0.4 kg*9.8 m/s²= 3.92 kg*m/s²
  • If we convert the units now, the problem will be much easier later on.
  • 1 kg*m/s² is equal to 1 Newton. So, our answer of 3.92 kg*m/s² is equal to 3.92 N

PE=(3.92 \ N )(2 \ m)

Multiply.

  • 3.92 N* 2 m=7.84 N*m
  • 1 Newton meter is equal to 1 Joule (this is why we converted the units).
  • Our answer is equal to<u> 7.84 Joules.</u>

PE=7.84  \ J

Aliun [14]3 years ago
4 0

Answer:

7.84 is your answer ok bye

You might be interested in
A boy throws a ball into the air at 10.2 m/s. Assuming that only gravity acts on the ball, how high does it rise, in m?
ozzi
Answer: 5.31 meters

Explanation: Use conservation of energy. Initial energy equals final energy. Initially, there is only kinetic energy (because height = 0 initially). At the end, kinetic energy equals 0 because at max height, there is max potential energy and the ball stops moving for a split second.

mgh = .5mv^2
Masses cancel out
gh = .5v^2
(9.8)(h) = .5(10.2^2)
Solve for h. h = 5.31 meters
5 0
3 years ago
What is SI unit electric current ?​
amid [387]

Answer:

the si unit of electric current is Ampere .the flow of charge in a close circuit is called electric current

4 0
3 years ago
A car of mass 1600 kg can just be lifted what is the least force that the electronicmagnet must use to lift the car ?
Mkey [24]

The car's mass is 1600 kg.

Its weight is (mass) x (gravity).  

On Earth, that's (1600 kg) x (9.8 m/s²)  =  15,680 Newtons.

At the moment, that's the only force acting on the car, directed downward and provided by gravity.

If you want to lift the car, then the net force has to be directed upward, and must either exactly cancel or exceed the force of gravity.

So the minimum force required to lift the car is <em>15,680 Newtons</em>, directed vertically upward.

5 0
3 years ago
The three branches of science are ____, earth, and physical
Rom4ik [11]
The three branches of science are life, earth, and physical science.
Life science deals with living organisms, so, biology is the most important of these sciences, although there are many.
Earth science deals with Planet Earth, studying its atmosphere, lithosphere, etc.
Physical science studies the inorganic world.
5 0
3 years ago
Read 2 more answers
Why do different stars have different life cycles
lana66690 [7]
The answer is shape is determined. A stars life cycle is determined in its size
3 0
3 years ago
Other questions:
  • When waves travel through water, why do the moving water particles continue to return to their starting position?
    13·1 answer
  • Is there is only one tool used to heat equipment in the laboratory.
    7·2 answers
  • A stone was projected at an angle of 40o and initial velocity of 20m/s. (a.)Determine the time of flight  (b)Maximum height.
    9·1 answer
  • Suppose that you travel to a planet that has 4 times the Earth's mass and 4 times the Earth's radius. Calculate how much more or
    12·1 answer
  • If white light shines on an object and the red, orange, green, blue and purple light is absorbed. What color does your eye see?
    12·2 answers
  • How do objects at rest and in motion respond in the presence of an external, unbalanced force?
    13·1 answer
  • Find the acceleration for a force of 2 N acting on 2 kg.
    5·1 answer
  • Which of the following choices correctly pairs the organism with its phylum?
    13·1 answer
  • The following graph shows the force exerted on and the displacement of object being pulled
    11·1 answer
  • In a small village in southern Italy, childbirth is considered?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!