How much energy is needed to heat and melt 3.0 kg of copper initially at 83°c? 450 kcal 430 kcal 280 kcal 130 kcal

The energy required would be 280 kcal

We can find out the required amount of energy with the help of the equation

Q = mcΔT

where m shows the mass

c shows the specific heat

and ΔT shows the heat change

So putting the values in the equation

Energy to reach melting point = mass x specific heat x change in temperature from 83 C to melting point.

=(3.0kg)(387J/kg•°C)(1084°C - 83°C)  

= 1.1 x 10^6J

OR

280 Kcal

the independent variable, the one that is intentionally manipulated, is whether or not the car hits the barrier.

the dependent variable, the one that you measure the response in, is the distance that the washers travel.

its c i just checked it