From the law of conservation of momentum the initial momentum is equivalent to the final momentum. Therefore, the total momentum before firing will be equivalent to the momentum after firing. if we take mass of the projectile to be mass i and that of the cannon as mass ii.
The initial momentum will be given by m1v1 +m2v1
This initial momentum is equivalent to zero since initially both the cannon and the projectile are at zero velocity.
The final momentum is given by m1v2 + m2v3, where v2 is the velocity of the projectile and v3 is the recoil velocity of the cannon.
Therefore, m1v2 + m2v3 =0
( 5 × 30 ) + ( 500 × v3) =0
500 v3 = -150
v3 = - 0.3 m/s
The velocity is negative indicating that the cannon moved in the opposite direction. therefore, the recoil velocity is 0.3 m/s
Answer:
Potential energy is stored energy.
The answer would be:
The comb gains electrons.
The hair loses electrons.
In chemistry, the charge depends on the electrons and protons. The electron will give negative charge and proton will give the positive charge. Proton is located in the nucleus of the atoms so it won't easily move like electron which located in the orbit in the atoms perimeter. So, ignore the option with the proton.
If the combs become negatively charged, that means it gain some electron. Since something gain electron, that means another thing is losing an electron. That electron comes from the hair.
C light energy
The solar energy from the sun converts to chemical potential energy
