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Harlamova29_29 [7]
2 years ago
11

What is the change in internal energy (in J) of a system that releases 675 J of thermal energy to its surroundings and has 525 c

al of work done on it
Physics
1 answer:
Savatey [412]2 years ago
6 0

Answer:

1519.5 joules

Explanation:

What is the change in internal energy (in J) of a system that releases 675 J of thermal energy to its surroundings and has 525 cal of work done on it

first, convert cal to joules

1 cal =4.18 joules

so 525 cal = 525 X 4.18 = 2194.5 joules

the system spent 675 joules heating the surroundings and was given

2194.5 joules by work done on it

so the net gain in energy is

2194.5 -675 = 1519.5 joules

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julia-pushkina [17]

Answer:

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Explanation:

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The directions of these two forces are exactly opposite of one another. Besides, because Spiderman is accelerating upwards, the magnitude of F(\text{tension}) (which points upwards) should be greater than that of W (which points downwards towards the ground.)

Subtract the smaller force from the larger one to find the net force on Spiderman:

(\text{Net Force}) = F(\text{tension}) - W.

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(\text{Net Force}) = m \cdot a.

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m \cdot a = (\text{Net Force}) = F(\text{tension}) - W.

Therefore:

\begin{aligned}& F(\text{tension})\\ &= m \cdot a + W \\ &= m \cdot (a + g)\\ &= 76\; \rm kg \times \left(1.3\; \rm m \cdot s^{-2} + 9.8\; \rm m \cdot s^{-2}\right)\\ &\approx 8.4\times 10^{2}\; \rm N\end{aligned}.

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Aunt Matilda goes to a well and throws a penny straight down the well at 3.0 m/s. She hears a splash after 0.5 seconds. How deep
nevsk [136]

Answer : The correct option is (d) 2.73 m

Explanation :

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s=ut+\frac{1}{2}at^2

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