A coin is dropped in a lift. It takes time t1 to reach the floor when lift is stationary. It takes time t2 when lift is moving up with constant acceleration. Then relate t1 and t2.

Asked by Last Modified  

2 Answers

Learn Physics

Follow 2
Answer

Please enter your answer

JEE Main Maths, Physics With 12 years exp.

t2<t1
Comments

If the height of the coin from which it is dropped is h then in stationery state of the lift we have h =(1/2)g t1^2 Or. t1=(2h/g)^(0.5)…………. (1) In the second case if the acceleration of the lift is a then acceleration of the coin for the observer in the inertial frame (effective...
read more
If the height of the coin from which it is dropped is h then in stationery state of the lift we have h =(1/2)g t1^2 Or. t1=(2h/g)^(0.5)…………. (1) In the second case if the acceleration of the lift is a then acceleration of the coin for the observer in the inertial frame (effective acceleration ) is =acceleration due to gravity (g) - acceleration of the lift wrt the inertial frame( - a) =(g+a) Here the directions of g and a are opposite to each other and they have directions downward and upward respectively. In this case the height h would be covered with acceleration (g+a).Thus h=(1/2)(g+a)( t2)^2 Or t2=(2h/(g+a))^(0.5)……………. (2) From relations (1) and (2) we have t1/t2=[(g+a)/g]^(0.5) read less
Comments

Related Questions

What are vectors?

https://vz-3ad30922-ba4.b-cdn.net/db7918fa-2411-444b-99eb-6fb412b9d10f/play_480p.mp4
Suryansh

What is terminal velocity 

 

 

 

 

 

Terminal velocity is the fastest speed something can fall through the air. It happens when the force pulling it down (gravity) is balanced by the force pushing up (air resistance), so it doesn’t...
Kishore

What is the gravitatioal SI unit of work done?

It's joule .for all type of work done and energy .
Samrat

Fixity is always needed for rotational motion?

Yes for pure rotation, the distance between two particles will always remain constant.
Rahul Srivastava
What is the best way to master physics?
The best way to master Physics is firstly to understand concepts at a deeper level. Then find out its applications, especially observing the things related to day to day life. For example, when you place...
Aparna
0 0
5

Now ask question in any of the 1000+ Categories, and get Answers from Tutors and Trainers on UrbanPro.com

Ask a Question

Related Lessons


NEET : a possible dream
When I was in class Xi , I wonder seeing a doctor.It seems almost impossible.Its been five years from then ,I'm a final year MBBS student at CMC ,oldest medical College in whole Asia . It took me 2 years...

How To Solve A Mechanics Problem?
Solving a mechanics problem especially at JEE level is all about getting into right thinking framework. Step 1: Picking a frame of reference. It can be solved from inertial frame of reference or non-nertial...


Law of Motion physics class 9 by sunil Sir
Law of motion Sir Isaac Newton was one of the greatest scientists and mathematicians that ever lived. He was born in England on December 25, 1643. He was born the same year that Galileo...

Recommended Articles

While schools provide formal education to the children, the home is where they start learning about things informally. Parents think that schools will take the initiative to educate their children. Well, this is partially true, as parents also play an essential role in bringing up their child. For the development of particular...

Read full article >

With the mushrooming of international and private schools, it may seem that the education system of India is healthy. In reality, only 29% of children are sent to the private schools, while the remaining head for government or state funded education. So, to check the reality of Indian education system it is better to look...

Read full article >

Appearing for exams could be stressful for students. Even though they might have prepared well, they could suffer from anxiety, tension etc. These are not good for their health and mind. However, following a few exam preparation tips can save them from all these and help them to score good marks. Let’s find out all...

Read full article >

Quality education does not only help children to get a successful career and life, but it also hugely contributes to society. The formal education of every child starts from school. Although there are numerous schools, parents find it challenging to choose the right one that would fit their child. It is difficult for them...

Read full article >

Looking for Class 11 Tuition ?

Learn from the Best Tutors on UrbanPro

Are you a Tutor or Training Institute?

Join UrbanPro Today to find students near you