Answer:
Explanation:
The magnitude of the change in momentum of block A is <u>equal and opposite </u>the magnitude of the change in momentum of block B.
According to law of conservation of momentum , there should not be any change in the momentum in the system .The system consists of A and B . So if some change in momentum has occurred in A , the other must have equal and opposite change in momentum so that they get cancel out and net change in momentum of system is zero.
The statement is false.
Pitch of a sound wave is the quantity that determines how high or low a sound is when it is perceived. A higher pitch corresponds to a higher frequency.
There could be another case, the Doppler's effect. the source or the observer might be moving towards the other. In such cases, the frequency of the sound wave does not change but it appears to be rising due to the motion.
Answer:(a)does not change
Explanation:
Given
Submarine is 50 m below the surface
Now submarine descends to 100 m and stops
As we know that pressure difference at a depth of h is given by
where 
=Density of fluid
g=acceleration due to gravity
h=height below free surface of liquid
buoyant force is equal to volume displaced by object
as the submarine is already in water therefore buoyant force will remain same.
Answer:
According to newtons first law of motion an object remains in its state of rest or motion in a straight line unless an external unbalanced forces acts upon it. This is the reason why Newtons first law of motion is often called the LAW OF INERTIA
