Question

16. A wheel of a cart is making 4 revolutions per second.
If the diameter of the wheel is 84 cm, find its speed.​

Answer 1

Answer:

diameter 'd' = 84 cm

distance covered in one revolution = circumference of the wheel

= pi*d

= %2822%2F7%29%2A84

= 22*12 =264 cm

Distance covered in 1 sec = 5*264 cm = 1320 cm

Distance covered in 1 hour (3600 seconds) = 3600*1320 cm

OR 47.52 Km

So speed of the cart = 48 Km/hr (approximately)

Step-by-step explanation:my first answer plz mark me brainliest

Answer 2

Answer:

r=42 cm

hence circumference =2pi42=84pi

total distance = 84pi x 4

speed = distance /time =84pi x 4/1= 336 pi cm/s