Gravitational force, Physics

Assignment Help:

A body of mass 2 kg thrown vertically upwards with a velocity 40 m/s comes to instantaneous rest at a height 50 m. Is there any other force (other than gravitational force), if yes then calculate the value.

Ans) Yes , a force due to air drag will be there , to calculate this wehave to first find work done by air drag..

Acc. To work-energy theorem

Wgravity + Wair drag = change in K.E.

-Mgh +Wair drag = change in K.E.

Wair drag =change in K.E. +mgh

=[0-1/2mu2] +mgh = -1/2 x 2 x (40)2 + 2x 10 x 50

                            = -1600+1000 = -600J

now w.d. = F x s

F= -600/50 = -12N


Related Discussions:- Gravitational force

Light, diffenrence between pure and impure spectrum.

diffenrence between pure and impure spectrum.

Nicol prism, How nicol prism can be used as a polariser and an Analyser

How nicol prism can be used as a polariser and an Analyser

Examine application of thin film technology, 1) Examine a particular thin f...

1) Examine a particular thin film system in some depth -review the literature. Ag deposited on GaAs Al deposited on Si Fe/Cr/Fe multilayer structures   2) E

Explain about the number of modes in the optical fibres, Explain about the ...

Explain about the number of modes in the optical fibres. Mode in the optical fibres: A mode is a path occupied by a ray of light through an optical fibre. This is a mathemat

What is the sign of the charge of the cup, Regard as two Styrofoam cups. Ea...

Regard as two Styrofoam cups. Each one is on the end of its own neutral slender glass rod which serves as a handle. One of the cups has a fixed amount of positive charge consistent

Explain degree of freedom, The number of independent directions in which a ...

The number of independent directions in which a system (or gas molecule) can have motion, are called as the number of degrees of freedom of that molecule or object. The number of d

Disadvantages of low power factor, Disadvantages of Low Power factor G...

Disadvantages of Low Power factor Greater conductor size : To transfer or distribute a fixed amount of power at constant voltage, the conductor will have to carry more current

What do you mean by angular dispersion, Describe dispersive power of the ma...

Describe dispersive power of the material of a prism. What do you mean by angular dispersion?

#title.electronics., actually in my college we are going to celebrate depar...

actually in my college we are going to celebrate department function for physics we have to keep demos in physics for a project but i don''t have any idea will u help me

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd