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

#title.kinematics., what is the difference between diplacement and distance...

what is the difference between diplacement and distance

Which colours of visible light has the longest wavelength, Which of the fol...

Which of the following colours of visible light has the longest wavelength? Is it: a) Violet b) Green c) Yellow d) Red Ans: Red colour of visible light h

Ionic polarization, The contribution of ionic polarization takes account of...

The contribution of ionic polarization takes account of the fact that when in a molecule some of the atoms have an excess positive or negative charge (resulting from the ionic char

Characteristic of a photodiode, a) Sketch an IV characteristic of a photodi...

a) Sketch an IV characteristic of a photodiode, showing how the curve shifts as a result of the illumination intensity incident on the device being varied. b) Indicate on the c

Assignment, composition of simple harmonic motion

composition of simple harmonic motion

Speed-time graph, A girl starts and finishes the ride at rest. Her horizont...

A girl starts and finishes the ride at rest. Her horizontal motion can be take as. •an initial uniform acceleration for 3.0s, followed by •a constant speed of 2.4m/s for a further

Explain electric lawn-mower, Explain electric lawn-mower A television ...

Explain electric lawn-mower A television set having a power rating of 120W and electric lawn-mower of power rating 1 kW are both linked to a 240V supply. If 3A, 5A and 10A

Electricity, Characteristics of resistances connected in parallel

Characteristics of resistances connected in parallel

Projectile motion, write all equationes of projectile motion used in calcul...

write all equationes of projectile motion used in calculation of vertical and horizontal motion

Mechanical properties of solids, Assignment of applications of elastic beha...

Assignment of applications of elastic behaviour of materials

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