An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.
Solution and Explanation
Radius of the circular orbit, \(r\) = \(42250\) \(km\)
Time taken to revolve around the earth, \(t\) = \(24\) \(h\)
Speed of a circular moving object, \(v\) = \(\frac{(2\pi r)}{t}\)
= \(\frac{\bigg[2× (\frac{22}{7})×42250 × 1000\bigg] } {(24 × 60 × 60)}\)
=\(\frac{(2×22×42250×1000) }{(7 ×24 × 60 × 60) }m s^{-1}\)
=\(3073.74\; m s ^{-1}\)
Top CBSE Class IX Questions
- The following table gives the lifetimes of 400 neon lamps:
Length (in hours)
Number of lamps
300 − 400
14
400 − 500
56
500 − 600
60
600 − 700
86
700 − 800
74
800 − 900
62
900 − 1000
48
(i) Represent the given information with the help of a histogram.
(ii) How many lamps have a lifetime of more than 700 hours? - Give an example to show that even as a young girl Santosh was not ready to accept anything unreasonable.
- Where was Abdul Kalam’s house?
- What do you think Dinamani is the name of? Give a reason for your answer.
Why was Santosh sent to the local school?
Concepts Used:
Speed and Velocity
The rate at which an object covers a certain distance is commonly known as speed.
The rate at which an object changes position in a certain direction is called velocity.
Difference Between Speed and Velocity:
Read More: Difference Between Speed and Velocity