Answer:
(d) a net external force must be acting on the system
Explanation:
Momentum is given as the product of mass and velocity.
P = MV
According to Newton's second law of motion, " Force applied to a body (system) is directly proportional to the rate of change of momentum of the body (system) which takes place in the direction of the applied force (external force).
F ∝ΔMV
Therefore, If the total momentum of a system is changing, a net external force must be acting on the system.
(d) a net external force must be acting on the system
Answer:
According to our principle, when an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration. In Example D, the object is moving in the negative direction (i.e., has a negative velocity) and is speeding up.
Explanation:
The correct answer is B, electrons emit and absorb energy based on their position around the nucleus.
Explanation:
According to Newton's second law of motion, the rate of change of momentum is directly proportional to the applied unbalanced force. The mathematical expression is given by:
![F=\dfrac{d(mv)}{dt}](https://tex.z-dn.net/?f=F%3D%5Cdfrac%7Bd%28mv%29%7D%7Bdt%7D)
Where
F is the applied force
m is the mass of the object
v is the velocity with which it is moving
![F=m\dfrac{dv}{dt}](https://tex.z-dn.net/?f=F%3Dm%5Cdfrac%7Bdv%7D%7Bdt%7D)
Momentum of a particle is given by the product of mass and velocity as :
![p=mv](https://tex.z-dn.net/?f=p%3Dmv)
Hence, this is the required solution.
All transverse waves can be polarized. this is because these waves oscillate at 90 degrees to the direction of energy movement.