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
Alekssandra [29.7K]
3 years ago
12

How much work must be done by frictional forces in slowing a 1000-kg car from 26.1 m/s to rest? a.3.41 x 10^5 J b.2.73 x 10^5 J

c.4.09 x 10^5 J d.4.77 x 10^5 J
Physics
1 answer:
algol133 years ago
6 0

Answer:

Work done by the frictional force is 3.41\times 10^5\ J

Explanation:

It is given that,

Mass of the car, m = 1000 kg

Initial velocity of car, u = 26.1 m/s

Finally, it comes to rest, v = 0

We have to find the work done by the frictional forces. Work done is equal to the change in kinetic energy as per work - energy theorem i.e.

W=k_f-k_i

W=\dfrac{1}{2}m(v^2-u^2)

W=\dfrac{1}{2}\times 1000\ kg(0^2-(26.1\ m/s)^2)

W = −340605 J

or

W=3.41\times 10^5\ J

Hence, the correct option is (a).

You might be interested in
The matter that makes up a planet is distributed uniformly so that the planet has a fixed, uniform density. How does the magnitu
Trava [24]

Answer:

the acceleration due to gravity g at the surface is proportional to the planet radius R (g ∝ R)

Explanation:

according to newton's law of universal gravitation ( we will neglect relativistic effects)

F= G*m*M/d² , G= constant , M= planet mass , m= mass of an object , d=distance between the object and the centre of mass of the planet

if we assume that the planet has a spherical shape,  the object mass at the surface is at a distance d=R (radius) from the centre of mass and the planet volume is V=4/3πR³ ,

since M= ρ* V = ρ* 4/3πR³ , ρ= density

F = G*m*M/R² = G*m*ρ* 4/3πR³/R²= G*ρ* 4/3πR

from Newton's second law

F= m*g = G*ρ*m* 4/3πR

thus

g = G*ρ* 4/3π*R = (4/3π*G*ρ)*R

g ∝ R

8 0
4 years ago
If there is a net force on an object in the direction it is already moving, what has to happen to the speed of the object?
baherus [9]
Net force is an unbalanced force, so the object will change speed or direction.
Either the object may speed up or slow down.
8 0
4 years ago
The columns in the periodic table are called groups. What do the elements in group 18 have in common
dimaraw [331]

Answer: D

Explanation:

they are all odorless, colorless, monatomic gases with very low chemical reactivity.

Brainliest?

7 0
3 years ago
Answer the question to the scenario below. What would you do if you were in this situation? Explain what you would do and why? B
lana [24]

Well talking , reading and writing are the tri skills merging for regular communication . It is most crucial to learn how to behave in a disciplined environment .Trying to help a person who does not speak the same language that you do won't be a rose walk journey . Learn to think and write complete things related to skill development and shape your personality .

Stamina to rejuvenate and think with more alacrity arouses when you read your confidence. Character sketching is one of the solution greatly can impact on thinking abilities and speaking art. Language is not just the soul of the communication but also holds integral part to satire public and attract them.

To understand more about skill development

brainly.com/question/24220604

#SPJ1                                              

5 0
2 years ago
01:16:1
Talja [164]

Answer:

Hurricane

Explanation:

Hurricane can be described as a huge storm that came with a strong and harsh wind. This wind tends to move in a circular motion over warm ocean water that are found in tropical regions.

Hurricane comes with strong winds that move at the rate of over 60 miles per hour, this results in the formation of a heavy rainfall. Hurricanes are also referred to as cyclones depending on where they take place. In places like Florida, which is surrounded by the Atlantic ocean the type of natural hazard that occurs there is known is hurricane.

Hurricane is formed when warm air that emanates from the ocean begins to rise up to a very high temperature, When it comes across a much more cooler air the steam condenses and results in a heavy downpour.

3 0
3 years ago
Read 2 more answers
Other questions:
  • A 17 kg box sitting on a shelf has a potential energy of 350 J. How high is the shelf? Round your answer to the nearest whole nu
    7·2 answers
  • How does the sun provide us with the energy we need to run our bodies?
    14·2 answers
  • What should you do if you need to pull over to get some rest?
    15·1 answer
  • Why are most cooking pots and pans made from metal
    5·1 answer
  • Why might the plant in the dark have grown taller?
    5·1 answer
  • A line spectrum is produced when an electron moves from one energy level _________.a.) to a higher energy levelb.) to a lower en
    5·1 answer
  • HELP ME PLSSS What are the possible genotypes
    5·2 answers
  • 6.1 Write down, in words, the principle of conservation of mechanical energy.​
    10·1 answer
  • A substance sample has a Mass of 45.0 g, and the Data Safety
    14·1 answer
  • A current-carrying ohmic metal wire has a cross-sectional area that gradually becomes smaller from one end of the wire to the ot
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!