The largest value of current that the breaker can carry = Imax=35.4A
Explanation:
Rms value of current= Irms= 25 A
The rms current and the maximum current are related as
Imax= √2 Irms
Imax=√2 (25)
Imax=35.4 A
Thus the maximum current carried by the breaker= 35.4 A
Question: How fast was the arrow moving before it joined the block?
Answer:
The arrow was moving at 15.9 m/s.
Explanation:
The law of conservation of energy says that the kinetic energy of the arrow must be converted into the potential energy of the block and arrow after it they join:

where
is the mass of the arrow,
is the mass of the block,
of the change in height of the block after the collision, and
is the velocity of the arrow before it hit the block.
Solving for the velocity
, we get:

and we put in the numerical values
,



and simplify to get:

The arrow was moving at 15.9 m/s
To keep the energy going every day