A bucket containing water is whirled in a vertical plane. What is the condition required to ensure that water does not spill from the bucket even at the upper-most point of the path? Assume r is the radius of the path and v is the velocity of the bucket.

A) The bucket should have a velocity of
r
.
B) The bucket should have a velocity of
g
.
C) The bucket should have a minimum velocity of
gr
.
D) The bucket should have a maximum velocity of
g/r
.

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

b. a lightning bug, plug of grass, and a worm