Different wavelengths of light are seen as colors
Answer:
The speed of the combined vehicles is 6.82m/s
Explanation:
Using the law of conservation of momentum which stayed that the sum of momentum of bodies before collision is equal to their sum of momentum after collision. After collision, both object moves with the same velocity.
Momentum = mass×velocity
Before collision:
Momentum of vehicle or mass 3000kg moving with velocity 25m/s
= 3000×25
= 75000kgm/s
Pa = 75000kgm/s
Momentum of vehicle with mass 2500kg moving with velocity of -15m/s
= 2500×-15
= -37500kgm/s
After collision:
Momentum = (3000+2500)V
Where v is their common velocity
Momentum after collision = 5500V
Based on the law:
75000+(-37500) = 5500V
75000-37500 = 5500V
37500 = 5500V
V = 37500/5500
V = 6.82m/s
Answer:
Explanation:
For this case we know that the charge associated to the transferred electrons of the small spark is 
and we want to find the number of electrons transferred.
From the properties of matter we know that the charge of the electron is
And we know that the total charge is given by this expression:
Where Q represent the charge, n the number of electrons and e the charge of the electron.
If we solve for n we got:
And replacing we got:
