Question

please answer it ques 5​.

Answer 1

Answer:

0.011 m/s

Explanation:

Given :

• Time taken = t = 60 seconds

• Radius of the dial of the clock = r = 10.5 cm = 0.105 metres

To find :

• Speed of the tip of the seconds hand of the clock

Speed = distance / time

Distance

Distance = 2×22/7×0.105

Distance = 44/7×105/1000

Distance = 660/1000

Distance = 0.660 metres

Speed = 0.660/60

Speed = 0.011 m/s

The speed of the tip of the seconds hand is equal to 0.011 m/s

Answer 2

Given:

• The second hand takes 60s to take one circular rotation
• Radius of clock = 10.5cm

To find:

• Speed of tip

Solution:

We know that

One circular rotation = 2πr

Where , r is radius

Here , one circular rotation = Distance travelled because , the tip rotates 60s = 1min = one complet rotation

Distance = 2 × 22/7 × 10.5

Distance = 21 × 22/7

Distance = 3 × 22

Distance = 66cm = 0.066 m

Now ,

Speed = distance/time

♦ Speed = 0.066/60

♦ Speed = 0.0011 m/s