Answer:
Explanation:
Knowing that the volume of a sphere is V=(4/3)πr³ and
We must find when r=14cm
V=(4/3)πr³ ⇒
and r=14cm then
Note: as you can see the relationship of change of r with respect to t is negative because it is a decrease, and also its volume ratio
Answer: 9kgm/s
Explanation:
Given that,
Mass of ball = 3 kg
Speed by which ball moves = 3 m/s. Linear momentum of the ball = ?
Since momentum refers to the quantity of motion of the moving ball,
Linear momentum = Mass x Speed
= 3kg x 3m/s
= 9 kgm/s
Thus, the linear momentum of the ball is 9kgm/s
As per question the coin is falling under gravity as there is no other force that has bee mentioned here.
so the equation of motion for a freely falling body is given as-
here the initial velocity is zero as the coin was at rest.
hence we have
so now we have to calculate the displacement of the coin at various instants.
at t=0.2212 s,we have
=0.2398m[upto four decimal digit
again when t=0.737 s
s=
=2.662m [upto three decimal digit] [ans]