Gravitation- numerical probelm, Physics

Assignment Help:

A ball dropped from a balloon at rest clears a tower  81m high during the last quater second of its journey. Find the height of the balloon and the velocity of the body when it reaches the ground.

WHAT IT MEANS- LAST QUATER SECOND OF ITS JOURNEY.
 
Solution) The last quarter of the jouney menas 1/4th of the total time it requires in its total journey.

Let total time be 4t, u = 0.

So, v at 3t = 3gt, and at 4t = 4gt.

by v² = u² + 2as,

16g²t² = 9g²t² + 2g(81)

7g²t² = 162g

7gt2 = 162

t² = 162 / 7g

t = 1.5 sec.

but time is 4t = 6 sec.

So velocity on reaching = 4gt = 58.8 m/s

With this velocity, height of fall = 2t(58.8) = 705.6m


Related Discussions:- Gravitation- numerical probelm

Surface tension, why does rain water boils faster than fresh water

why does rain water boils faster than fresh water

Nickel cadmium batteries -construction, Nickel cadmium batteries -Construct...

Nickel cadmium batteries -Construction: The plates of a nickel cadmium battery are made by sintering a nickel plated steel screen with nickel carbonyl powder. The resultant pla

Explain the concept of prism, Prism is a transparent phase rounded by refra...

Prism is a transparent phase rounded by refracting surfaces, like the incident surface and emergent surface (from which light rays emerges) are plane and non parallel

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

What is neutral points , At the neutral position, magnetic field because of...

At the neutral position, magnetic field because of the bar magnet is just equal and opposite to the horizontal component of earth's magnetic field.

Experiment of heater, Heater Another form of heater can be made from an...

Heater Another form of heater can be made from an old oil tin. Iron wire is wrapped round a test tube and twisted to form a handle.

Biot savart law, state biot savart law and hence calculate magnetic inducti...

state biot savart law and hence calculate magnetic induction due to current in a circular coilof wire at a point on its axias

Time base control 1, The Time Base Control 1 The timebase control panel...

The Time Base Control 1 The timebase control panel gives the TIMEBASE (4), ZOOM (7) and FOCUS (5) parameters. TIMEBASE and ZOOM merged set the time scale in seconds per divisio

Polymers, explanation on polymers tga curves

explanation on polymers tga curves

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