A swimmer takes 45 seconds to complete a 100-meter lap. Calculate the swimmer’s average speed.
2 answers:
Answer:
Swimmer's velocity, v = 2.23 m/s
Explanation:
It is given that,
Distance, d = 100 meter
Time taken by the swimmer, t = 45 seconds
We have to find the average speed of the swimmer. Average speed is equal to total distance divided by total time taken i.e.
v = 2.23 m/s
So, the velocity of the swimmer is 2.23 m/s. Hence, this is the required solution.
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Answer:
a
The orbital speed is
b
The escape velocity of the rocket is
Explanation:
Generally angular velocity is mathematically represented as
Where T is the period which is given as 1.6 days =
Substituting the value
At the point when the rocket is on a circular orbit
The gravitational force = centripetal force and this can be mathematically represented as
Where G is the universal gravitational constant with a value
M is the mass of the earth with a constant value of
r is the distance between earth and circular orbit where the rocke is found
Making r the subject
The orbital speed is represented mathematically as
Substituting value
The escape velocity is mathematically represented as
Substituting values