Gravitation- numerical probelm, Physics

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

Posted Date: 3/11/2013 7:13:32 AM | Location : United States







Related Discussions:- Gravitation- numerical probelm, Assignment Help, Ask Question on Gravitation- numerical probelm, Get Answer, Expert's Help, Gravitation- numerical probelm Discussions

Write discussion on Gravitation- numerical probelm
Your posts are moderated
Related Questions
Two particles of equal mass m go around a circle of radius R under the influence of their mutual gravitational attraction.the speed of each particle with respect to their center of

Evaluate the volume of the bubble A diver releases an air bubble of volume 2.7cm 3  from a depth of 17 below the surface of a lake, where the temperature is 8.0°C. What is the v

What are simple ways to quantify the dryness of a semi-permeable hard surface?

write a program about f=ma


Centrifugal pseudoforce A pseudoforce which occurs while one is moving in consistent circular motion. One feels a "force" directed outward from the center of motion.

An α particle is a positively charged particle. Rutherford observed the behaviour of these particles when they approach the interior of the atoms as shown in fig.  Rutherford ob

In optics what is intended by the expression "constructive interference." Answer: This is factual for any kind of waves. Any time you have coherent waves of the same kind


in water equivalent how the temperature or water and solid equal?