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

What is phyiscs, What is phyiscs Physics is a science. Science works ac...

What is phyiscs Physics is a science. Science works according to the scientific method. The scientific method accepts only reason, logic, and experimental evidence to tell amon

Explain the schematic diagrams of electric circuits, Explain the Schematic ...

Explain the Schematic Diagrams of Electric Circuits Since figuring out what is happening in a circuit depends upon the way the elements are connected, one of the first hurdles

Evaluate the speed will the string break, Evaluate the speed will the strin...

Evaluate the speed will the string break A certain string just breaks when it is under400N of tension. A boy uses this string to whirl a 10-kgstone in a horizontal circle of rad

What is the dimentional formula of plank''s constant?, The dimentional for...

The dimentional formula of  plank;s constant ML 2 T -1

Are there many type of single ends in optics fiber, Are there many type of ...

Are there many type of single ends? Single ends can be no matter which from a simple cut with snips or a cutter to a sophisticated polished encapsulation. The actual method use

Calculate the reaction gibbs energy, Under standard state conditions at 37 ...

Under standard state conditions at 37 o C, a biochemical reaction :             A ↔ B + C has an equilibrium constant K = 0.0422  mol/dm 3 . (i) Calculate the standard

Show the conditions for total internal reflection, Show the conditions for ...

Show the conditions for total internal reflection to happen. Arrive at the relation between refractive index and critical angle. What do you mean by optical fibre? on what rules do

Situation of the converging lens - principle ray III, Principle Ray III . P...

Principle Ray III . Preliminary from the head of the arrow that the object is ray III travels directly toward the focal point on the other side of the lens. However at the plane of

International system of units, The coherent & rationalized system of units,...

The coherent & rationalized system of units, derived through the m.k.s. system (that itself is derived from the metric system) in common employ in physics today.

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