Answer:
D
Explanation:
Cause im smart smart and the atom is very simple just use google lol
Answer:
Explanation:
We shall apply the formula for velocity in case of elastic collision which is given below
v₁ = (m₁ - m₂)u₁ / (m₁ + m₂) + 2m₂u₂ / (m₁ + m₂)
m₁ and u₁ is mass and velocity of first object , m₂ and u₂ is mass and velocity of second object before collision and v₁ is velocity of first velocity after collision.
Here u₁ = 22 cm /s , u₂ = - 14 cm /s . m₁ = 7.7 gm , m₂ = 18 gm
v₁ = ( 7.7 - 18 ) x 22 / ( 7.7 + 18 ) + 2 x 18 x - 14 / ( 7.7 + 18 )
= - 8.817 - 19.6
= - 28.4 cm / s
Answer:
Yes.
Explanation:
With no extra force acting upon it, it is a still object.
Like laying flat on a bed of nails. With no force pushing you down besides gravity, you will not cut yourself.
Answer:
B.)Angular momentum is always conserved
Explanation:
Angular momentum is given by:
![L=mvr](https://tex.z-dn.net/?f=L%3Dmvr)
where
m is the mass of the object
v is its speed
r is the distance between the object and the centre of its circular trajectory
In absence of external torques, angular momentum is always conserved. That means that for the spinning star, if its radius r decreases (because it shrinks), in order for L (the angular momentum) to be conserved, the speed (v) must increases, therefore the spinning star speeds up.
So, the correct choice is
B.)Angular momentum is always conserved
while discovered less than 100 years ago isotopes are now used in a wide variety of scientific applications that touch the lives of almost every citizen.