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
finlep [7]
3 years ago
12

A book is launched up along the rough incline. Kinetic energy given to a book at initial point is 100 J. Book comes to stop at s

ome point having potential energy 80 J, after what book starts to slide back. What will be its kinetic energy when it will return to the initial launching point?
(A) 60 J
(B) 100 J
(C) 80J
(D) 180 J
Physics
1 answer:
den301095 [7]3 years ago
7 0

Answer:

(A) 60 J

Explanation:

At state 1

KE₁=100 J

At state 2

KE₂ = 0

U₂=80 J

Given that surface is rough so friction force will act in opposite to the direction of motion

Lets take work done by friction = Wfr

From work power energy

Work done by all forces = Change in kinetic energy

Wfr + U₂=ΔKE

Wfr+80 = 100

Wfr= 20 J

Now when book slides from top position then

Wfr+ U = KEf - KEi

-20 + 80 = KEf-0

KEf= 60 J

(A) 60 J

You might be interested in
Without effective assessment methods, teachers have no documented proof of childrens specific ____ and _____.
schepotkina [342]

Answer:

D strengths and weakneses

Explanation:

8 0
3 years ago
Metallic bonds are responsible for many properties of metals, such as conductivity. Why is this possible? (1 point)
qaws [65]

Answer:

The bonds can shift because valence electrons are held loosely and more freely

Explanation:

Please give brainliest if you can,have a good day<3 :)

4 0
3 years ago
Which of the following is a typical property of an ionic compound
Yanka [14]

The answer is C.

Ionic compounds are those that bring together anions and cations bonded together by ionic bonds. The electrostatic forces of the different charges are significant in the bonds that make them strong hence require high energy to break them (high melting point).  Due to the regular structure of ionic compound that tend to form lattices in solid form, when struck, they shatter along the lines of weakness of the lattice.  

6 0
3 years ago
Read 2 more answers
This involves convection currents.
Julli [10]
"Wind patterns" is the one among the following choices given in the question that <span>involves convection currents. The correct option among all the options that are given in the question is the second option or option "B". The other choices can be easily negated. i hope that this is the answer that has helped you.</span>
6 0
3 years ago
Read 2 more answers
Two wheels having the same radius and mass rotate at the same angular velocity ((Figure 1) ). One wheel is made with spokes so n
liubo4ka [24]

Answer:

E. The wheel with spokes has about twice the KE.

See explanation in: https://quizlet.com/100717504/physics-8-mc-flash-cards/

6 0
3 years ago
Read 2 more answers
Other questions:
  • To increase the period of a mass-spring oscillator, increase the ___
    13·1 answer
  • A satellite in the shape of a solid sphere of mass 1,900 kg and radius 4.6 m is spinning about an axis through its center of mas
    13·1 answer
  • In an electric motor, periodically changing the electromagnet can cause the axle to spin because
    10·2 answers
  • A locomotive is accelerating at 3.08 m/s2. It passes through a 20.8-m-wide crossing in a time of 2.93 s. After the locomotive le
    15·1 answer
  • A plane is traveling at a velocity of 90 m/s. It accelerates at a constant rate of 1.5 m/s​2 until its velocity reaches 500 m/s.
    9·1 answer
  • Plz help with this<br> And thanks
    14·2 answers
  • this is my 5th time waisting my points for this question because I could fail my final and I am not getting any answers so can s
    10·1 answer
  • I really need help, whats 2+2
    8·1 answer
  • A small sphere of reference-grade iron with a specific heat of 447 J/kg K and a mass of 0.515 kg is suddenly immersed in a water
    14·1 answer
  • g What is the final velocity of a hoop that rolls without slipping down a 6.92 m high hill, starting from rest
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!