3 years ago

Speed depends on how far something travels and Question 1:

Physics

1 answer:

Yuliya22 [10]3 years ago

4 0

Answer: I think the answer is C

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= 16667 J /s

$\frac{Q_H}{W} =\frac{T_H}{T_H-T_C}$

where $Q_H$ and $W$ are heat supplied and heat given from outside source .

Here $Q_H$ = 16667 J/s

$\frac{T_H}{T_H-T_C}=\frac{298}{298-279}$

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$Q_H = 16667 J/s$

16667 / W = 15.684

W= minimum power supplied = 1062.7 W.

b )

If $T_C=283K$

$\frac{T_H}{T_H-T_C}=\frac{298}{298-283}$

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$\frac{Q_H}{W} = 19.87$

$W=\frac{Q_H}{19.87}$

$W=\frac{16667}{19.87}$

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An unknown mineral is scratched by a penny. It must _____.

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An athlete is running a 400m race around a 400m track. On the backstretch the athlete's velocity is 8m/s but he is running into

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Explanation:

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Drag force is given by

$F=\frac{1}{2}\rho CAv^2\\\Rightarrow F=\frac{1}{2}\times 1.2\times 1.1\times 0.5\times (8+2)^2\\\Rightarrow F=33\ N$

The drag force on the athlete is 33 N

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