At a distance of 4,000 ft from the launch site, a spectator is observing a rocket being launched. If the rocket lifts off vertically and is rising at a speed of 600 ft/sec when it is at an altitude of 3,000 ft, how fast is the distance between the rocket and the spectator changing at that instant?

3 years ago

Share

Answers : (2)

                                        

distance=s=√(40002+h2), rate of change of distance=ds/dt=(ds/dh)(dh/dt)=(d(√(40002+h2)/dh)(dh/dt),dh/dt=600 ft/sec

3 years ago
                                        

250/3 ft/sec using 2d figure

one year ago

Post Your Answer

More Questions On IIT JEE Entrance Exam

Ask Experts

Have any Question? Ask Experts
Post Question
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!!
Click Here for details
sir im in class 11. i hav started my preparation recently. wen i sit fr studying i study fr 1 hr and then take a break of another 1 hr. i dnt knw hw to cope wid dis problem. also, wen i see...
 
 
Its pretty good that you have such a matured thinking. You should not loose focus and be patient.The problem with you is that you are restless. You need to be calm. You have the aim in your...
  img
Aziz Alam one month ago
Hey, I am from Bangalore, I am in a bad situation now, the problem is have just done my 10 std in 2010, and I quit school for good reasons. Now I have decieded to resume my sudies and do my...
 
 
For JEE 2014 the eligibility criteria for admission, in context of age was: Born on or after 1 st October 1989 . So for JEE 2015 you can have the idea about the exact date, i.e., Born on or...
  img
Aziz Alam one month ago
can a student refer dinesh objective books for iit level in physics and chemistry instead of using o.p. tandon or j.d. lee .or pradeep ?
 
 
Dinesh Objective books are good but the stress on concepts on these books are less, whereas O.P Tandon or J.D.Lee gives focus fon concepts in a pretty good way. Fo IIT JEE, you need to put...
  img
Aziz Alam one month ago
state rank (obc) – 2040 state rank (gen) – 6099 home state – up. kindly tell will i get cs or ece at mnit allahabad in various counselling rounds.. also i have not got any of the above in 1...
 
 
These are the closing ranks for MNIT allahabad in Round 2 & round 3 (2013): Motilal Nehru National Institute of Technology, Allahabad-Computer Science & Engineering - Round 2 11958...
  img
Ramreddy 27 days ago
sir this year i am giving ntse exam...but i am not taking classes for it...so sir kaise prepare karna hoga..
 
 
Most of thing will come from your school syllabus. First, you should focus on the school study, plus there is a book for NTSE exam by Tata Mcgraw hill. You should focus on the book as well....
  img
Jitender Singh 2 months ago
I got 15000 air in jee mains. I'm from Tamil Nadu and general category. What courses will I get in nit? Will I get mechanical in nit trichy? State rank - 550
 
 
Yes! You will get NIT and IIITs and CFTI as per 2013 allocation. You can go for branch and college predictor on dctm.edu.in. All the best and Good wishes !
 
Prof Vivek Kumar one month ago
View all Questions »