Time = distance/speed
thus = 10/40
which comes to 1/4th of the hour that's 60/4 which is 15 minutes
Density = Mass / Volume
Density of stone = 100 / 10 = 10 g/mL
If the density is higher than water, then the object will sink. If the density of the object is lower than water, then the object will float.
Since the density of the rock is 10g/mL and the density of the water is 1g/mL, the stone will sink.
So all that really matters is the radius and how it changes, which is by a fact or of √3 and ∴ 6.52/√3 = 3.76cm which is the answer
The moon dosent revolve around earth as the earth rotates the moon stays in the same place
