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
Light is shined into a glass rod. To guarantee the total internal reflection (TIR) happens to all the possible rays, what is the minimum index of refraction n for the glass?

Rule 1: In order to sum or subtract two physical quantities the quantities must have the similar dimension. The final physical quantity has the similar dimensions. Physical quantit

conditions of equilibrium for concurrent force system

Three capacitors of capacitance 6µF each are available. Determine the minimum and maximum capacitances that could be acquired.

Ehrenfest paradox (Ehernfest, 1909) The special relativistic "paradox" including a quickly rotating disc. As any radial segment of the disc is perpendicular to the direction o

5 example of Classification and 5 types of Vectors and 3 Dimensional Forces


Give the basic construction of pentode Ans: Construction of Pentode:   Constructional details of a typical pentode are demonstrated in fig. (a)  and  fig. (b)  Pentode comp

A hiker tosses a rock into a canyon. He hears it strike water 4.78 s later. How far down is the surface of the water?

Q. Action to be made if the resistance to earth of earth electrode is high? Ans: Earth resistance lies upon soil conductivity. To reduce earth resistance dig around the earth