3 years ago

PLease answer this question or explain

Physics

1 answer:

scoray [572]3 years ago

8 0

Answer:

NOAA Scienctist

Explanation:

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Explanation:

1) the formula for the required energy is: Q=c*m(Bp-t), where c - 4100 J/kg*C; m - 0.9 kg; Bp - 100.6 C; t - 10 C.

2) according to the formula above:

Q=4100*0.9*(100.6-10)=41*9*906=334314 (J).

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A train travels 70 kilometers in 1 hours, and then 63 kilometers in 2 hours. What is its average speed?

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The answer is: " 44 $\frac{1}{3}$ km " ;
or; write as: " 44.333 km " .
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Explanation:
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(70 km + 63 km) ÷ (2 + 1 ) = 133 km ÷ 3 = " 44 $\frac{1}{3}$ km " ;
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D laboratory observation

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