1800-150-456-789
FlagBACK
Flag Modern Physics> a block of mass5kg is resting on a smooth...
question mark

a block of mass5kg is resting on a smooth surface.at what angle a force of 20N be acted on the body so that it will acqurie a kinetic energy of 40J AFTER MOVING 4M?

shibani , 7 Years ago
Grade 12th pass
anser 1 Answers
Sujit Kumar

Last Activity: 7 Years ago

I’m not sure if my answer is correct. According to me..... mass of the block is not required..... unless you want to calculate the acceleration.......... but this is how i did it....
 
Energy = Force x Distance
Hence the force that acted on the block = 40/4 = 10N
 
Now consider the block is being pulled by a thread with an angle \Theta with the horizontal.
 
 
therefore
 Cos\Theta=\frac{Adjacent Side}{Hypotenuse}=\frac{10}{20}=\frac{1}{2}
 
=>Cos\Theta=\frac{1}{2}
 =>\Theta=60^{\circ}
 
Ans: The force of 20N should be acted on the object with an angle of 60°

Provide a better Answer & Earn Cool Goodies

Enter text here...
star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Ask a Doubt

Get your questions answered by the expert for free

Enter text here...

Other Related Questions on Modern Physics

question mark
A particle is projected in vertical plane such that after 5 seconds its velocity becomes horizontal. The maximum height attained by the projectile from point of projection is n3 m. The value of n is _______. (g = 10 m/s2)
Modern Physics
1 Answer Available

Last Activity: 2 Year ago(s)

question mark
Two particles approach each other from very large distance as shown, . if the least separation between the particles is b, what is the speed of M in center of mass frame when particles are closest? (gravity negligible)
Modern Physics
0 Answer Available

Last Activity: 2 Year ago(s)

question mark
Can the sum of two equal vectors be equal to either vector
Modern Physics
0 Answer Available

Last Activity: 2 Year ago(s)

question mark
A nucleus X184 at rest emitt alpha particle With kinetic energy 9.0MeV. The product Nucleus is Y. The values of Binding energy per nucleon of alpha particle & Y differ by 1.5MeV. The values of Binding energy per nucleon of X & Y differ by (n÷230) MeV, then n is
Modern Physics
0 Answer Available

Last Activity: 2 Year ago(s)

question mark
SUBJECT: PROBLEM BASED ON LINE DETECTION.Query: How to apply all the filters for line detection on the following piece of image (provided below)? Explain its Observations to comment on its results.
Modern Physics
0 Answer Available

Last Activity: 2 Year ago(s)