Gravitational force, Physics

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

Posted Date: 3/12/2013 2:25:52 AM | Location : United States







Related Discussions:- Gravitational force, Assignment Help, Ask Question on Gravitational force, Get Answer, Expert's Help, Gravitational force Discussions

Write discussion on Gravitational force
Your posts are moderated
Related Questions

For an enzyme that follows Michealis-Menten kinetics, the initial velocity at different substrate concentration has been determined. [S] (mM) 0.1 0

what is the relation between linear and angular variable?

if you want to amplify input signal of +-20mV amplitude and a 100 MHz frequency,which parameters of OP-amp play a significant role? what should be the values of the parameters?just

Ripple tank The concept of reflection and refraction of light waves can be understood by the study of reflection and refraction of waves on water. The water waves travel

pseudo force: A "force" that arises since an observer is naively treating an accelerating frame like an inertial one.



The size of nucleus is measured in: (1)amu (2)Angstrom (3)Fermi (4)cm Ans: (3)Fermi

What is the wavelength of electromagnetic waves of frequency 5 x 1019Hz in free space? Give its two applications.