40 000 kg.m/s...P=MV then 20 000=M2V therefore Pnew=2MV i.e Pnew= 2Pold ...Pnew=2Pold...Pnew=2(20 000)...Pnew=40 000
Answer:
the final angular velocity of the system would be 400 rpm
Explanation:
Recall that the kinetic energy of a rotating object is defined as:
where I is the object's moment of inertia, and 
its angular velocity.
If the kinetic energy is conserved in the coupling of the two discs, then the final kinetic energy of the new system should be the same:
therefore the new angular velocity will be:
half of the initial angular velocity. That is :
the final angular velocity of the system would be 400 rpm
Answer:
Explanation:
We shall apply law of conservation of momentum .
m₁ v₁ = m₂ v₂
m₁ = 80 kg
v₁ = ?
m₂ = .43 kg
v₂ = 15 m /s
80 v₁ = .43 x 15
v₁ = .43 x 15 / 80
= .08 m /s
8 cm /s
option A is correct.
Law of conservation of momentum is applied only where no external force acts . Here during the period when ball was thrown , apart from internal force , external force like gravitational force was also acting but we still applied this law because the time duration of action of throw was very small
so we neglected the effect of external force . So it was just an approximation.
Answer:
The quantitative method
Explanation:
<em>Quantitative method is the use of numbers, graphs, logic, tables, charts, stadistics, etc.</em> This kind of method is objective, can be replicated and repeated, and it collects numeric data.
I hope you find this information useful and interesting! Good luck!
