The heat energy released or absorbed by a chemical reaction is generally determined by the difference between the energy that

Physics

1 answer:

Ket [755]3 years ago

5 0

Answer:

Must be put in to break the bonds in the reactants and the energy that is released upon making the bonds in the products.

Explanation:

The heat energy is absorbed to break the chemical bonds, which are responsible for the attractive interactions between atoms and molecules, and which gives stability to chemical compounds. While the heat energy is released upon making the bonds in the chemical compounds.

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You are trying to take an image of a particular star with apparent magnitude m=10, and need to figure out how long you will need

Natalka [10]

You haven't told us anything about the detectors being used. We don't know how the sensitivity of the detector is related to the total number of photons absorbed, and we don't even know whether you and your friend are both using the same type of detector.

All we can do, in desperation, is ASSUME that the minimum time required to just detect a star is inversely proportional to the total number of its photons that strike the detector. That is, assume . . .

(double the number of photons) ===> (detect the source in half the time) .

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So your telescope gathers (0.18/0.05)² = 12.96 times as much light as your friends telescope does.

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We're simply comparing the performance of two different telescopes as they observe the same object, so the star's magnitude doesn't matter.

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3 years ago

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Norma-Jean [14]

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4 years ago

In deep space, sphere A of mass 94 kg is located at the origin of an x axis and sphere B of mass 100 kg is located on the axis a

vlabodo [156]

(a) $-3.48\cdot 10^{-7} J$

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$U=-\frac{Gm_A m_B}{r}$ (1)

where

G is the gravitational constant

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$m_B = 100 kg$ is the mass of sphere B

r = 1.8 m is the distance between the two spheres

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$U=-\frac{(6.67\cdot 10^{-11})(94 kg)(100 kg)}{1.8 m}=-3.48\cdot 10^{-7} J$

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(b) $1.74\cdot 10^{-7}J$

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$K_f = U_i - U_f$ (2)