At a fabrication plant, a hot metal forging has a mass of 75 kg and a specific heat
1 answer:
Answer:
940°C
Explanation:
Heat lost by the forging = heat gained by the oil
-mCΔT = mCΔT
-(75 kg) (430 J/kg/°C) (47°C − T) = (710 kg) (2700 J/kg/°C) (47°C − 32°C)
-32250 (47°C − T) = 1917000 (15°C)
47°C − T = -892°C
T = 939°C
Rounded to two significant figures, the initial temperature is 940°C.
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Given required solution
M=10kg W=? W=Fd
v=5.0m/s F=mg
t=2.40s =10*10=100N
S=VT
=5m/s*2.4s
=12m
so W=12*100
W=1200J
I think the answer would be D.
There’s not enough info here i’m sorry
Answer:
C. both A and B
Explanation:
Sana nakatulong
1) Equivalent resistance, 1/R = 1/15 + 1/40 + 1/60 = 8+3+2 /120 = 13/120
R = 120/13 = 9.23
2) Current, I = V/R = 115/9.23 = 12.45 A
