Answer:
Explanation:
Let the mass of copper ball is "m" gram
now the total number of copper atom present in the ball is given as
now the total number of electrons in one copper atom is 29
so total number of electrons in given sample of copper ball is
now diameter of the ball is 7.0 mm
density of the ball = 
now we have
now we have
now the charge on the copper ball is 40 nC
so the number of electrons removed
so the fraction of number of electrons removed is given as
Answer:
B. Adding more protons to a positively charged body until the number of protons matches the number of electrons
Explanation:
Answer:
A chemical reaction
Explanation:
In a physical change the chemical composition of a matter stays the same. One example is a change in state of matter. Consider water, you can heat it to vapour and cool it to form ice but you can get the exact same mass and colour after any physical change happens.
To form a two or more substance an internal arrangement of atoms must happen. For that chemical change should occur as only in chemical reactions atoms are rearrange to form new substances.
Answer:
2100 kg*m/s
Explanation:
The proper term for power in this case is to use the physics term "impuls" = p.
1. Find the "power" developed by the gun to fire just 1 bullet.
2. multiply by 60 to find the power produced by the gun per minute.
p = m * v
where
m = mass of the bullet = 50 g = 0.050 kg
v = velocity of the bullet = 700 m/s
p = 0.050 * 700
p = 35 kg*m/s
So the impuls for 1 bullet is 35 kg*m/s
The gun can fire 60 bullets per minute so it's fireing power must there fore be 60 * 35 = 2100 kg*m/s
