Question

Q1.time period of a simple pendulum depends on the mass of the bob (m), length of the thread (I) and acceleration due to gravity (g) .build up the relation for time period using dimensional method​​​

Answer 1

Answer:

Question :-

Manu runs at the speed of 2 m/s in a 5 km race. How much time will she takes to complete the race?

Answer :-

Manu will take 2500 seconds to complete the race.

Explanation :-

Given :-

Speed of Manu = 2 m/s

Distance covered by Manu = 5 km

To Find :-

Time taken by Manu to complete the race?

Solution :-

❏ Converting units of distance :-

We know that,

✪ 1 km = 1000 m ✪

↪ Distance in m =(5 × 1000) m

➢ Distance in m = 5000 m

∴ Distance covered by Manu is 5000 m.

Now, we have distance covered by Manu as well as speed of Manu. So, we can easily calculate time taken by Manu by using formula of speed.

We know that,

✪ \bf Speed = \dfrac{Distance}{Time}Speed=TimeDistance ✪

Putting values in formula we get,

⇒ \sf 2 = \dfrac{5000}{Time}2=Time5000

⇒ \sf 2 \:\times\:Time = 50002×Time=5000

⇒ \sf Time = {\cancel{\dfrac{5000}{2}}}Time=25000

➠ \bf \red{Time = 2500\:s}Time=2500s

∴ Time taken by Manu to complete the race is 2500 seconds.