Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Vandana Hemasai 7 years, 8 months ago
- 0 answers
Posted by Ramesh Kumar Tiwari 7 years, 9 months ago
- 1 answers
Naveen Sharma 7 years, 9 months ago
Ans. Let Length of Train = x meter
Time taken to cover post = 10 sec
if a train pass post. it mean it is covering distance equal to its length
So speed = distancetime=x10 ....(1)
Again if it pass a bridge it cover distance equal to sum of length of bridge and length of train.
Length of Bridge = 2 Km = 2000 m
So distance covered = ( 2000 + x ) m
Time taken = 110 sec
So Speed = 2000+x110 ...........(2)
From (1) and (2), we get
=>x10=2000+x110
=> 110 x = 20000 + 10 x
=> 100x = 20000
=> x = 20000100=200 m/s
Posted by Rohit Poria 7 years, 10 months ago
- 1 answers
Gaurav Bhardwaj 7 years, 10 months ago
First find efficiency of engine = 1- lower temperature/higher temperature = 1/2 then amount of heat energy is two times of work done = 2400 joule
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app