Multiply the power (1,800 watts) by time (1,200 seconds) to get 2,160,000 joules (or 2.16 MJ)
The heat absorbed is calculated using the following equation:
Q = mCΔT
Q = heat absorbed
m = mass = 66 g
C = specific heat of iron = 0.449 J/g.°C
ΔT = temperature change = 20 - 7 =13°C
Therefore,
Q = 66*0.449*13 = 385.242 J
Answer:c) Positive acceleration describes an increase in speed; negative acceleration describes a decrease in speed.
Hey
I tried to answer before and it dident let me.
use Newton's gravitational law and 2nd law .....
