Ball made of wood and ball made of aluminum, of the same radius are placed into reservoir with water. aluminum ball after sinking rests at the bottom, wooden ball floats. which ball experiences greater buoyancy force? (14.4)

Aluminium

Explanation:

Given

Aluminium ball sinks after placing inside the water while wooden block floats.

Buoyancy on a body is given by

here

thus aluminium ball sinks

but for

only a part of wood is under the water i.e. not whole volume is not under water therefore net buoyancy is less in case of wood

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s