Question

The length of a minute hand of clock is 14cm.Find the area covered by minute hand in 120 minutes on the face of clock 

☡No Copied answers​

Answer 1

$\huge \colorbox{cyan} {Answer}$

the minute hand in 15 min.

Answer

Minute hand completes full circle degree in 60 minutes.

Angle swept by minute in 60 minutes =360°

Angle swept by the minute hand in 15 minutes =

60

360°

×15=90°

Therefore,

θ=90°

Length of minute hand =r=14cm

Area swept by minute hand in 15 minutes = Area of sector

As we know that area of sector is given as-

A=

360°

θ

×πr

2

Therefor,

Area swept by the minute hand in 15 minutes =

360°

90°

×(

7

22

×(14)

2

)=

4

1

×616=154cm

2

Hence the area swept by the minute hand in 15 minutes is 154cm

2

.

Hence the correct answer is 154cm

2

.

Answer 2

Oscillation is a periodic movement of a particle or a system that can cause a wave. A wave is created by an oscillation either mechanically or electromagnetically. An oscillation can occur due to a wave too. An oscillation is a phenomenon that is localized to a certain region whereas a wave is a phenomenon that travels.

$⠀⠀⠀⠀⠀⠀⠀$