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blagie [28]
2 years ago
9

Which law states that the orbit of each planet is elliptical and that the Sun is at one focus of each ellipse? A. Kepler's first

law B. Kepler's second law C. Kepler's third law D. Newton's law of universal gravitation
Physics
1 answer:
densk [106]2 years ago
8 0
A. Kepler's first law.
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Calculate ΔH∘f (in kilojoules per mole) for benzene, C6H6, from the following data:
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ΔH<span> for the reaction = [sum of heat of formation for products] - [sum of heat of formation for reactants]
   
-6534 = [(12)(-393.5) + (6)(-285.8)] - (2X)

-6534 = [(-4722) + (-1714.8)] - 2X

-6534 = -6436.8 - 2X

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-</span>97.2 = -2X<span>
 
then, divide each side by two to cancel out the numerical coefficient.

x = +48.6 kJ, which is the heat of formation for benzene.</span>
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2 years ago
During an experiment, a student moved a cell from pure water to salted water. What will most likely happen to the cell?
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Answer:

During an experiment, a student moves a cell from pure water to salted water. ... It will release water and shrivel. It will release water and burst.

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3 years ago
A 4.2 m board with a mass of 19 kg is pivoted at its center of gravity. A helium balloon attached 0.24 m from the left end of th
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Answer:

The torque on the board = 11.8 Nm in the anti-clockwise direction

Explanation:

Please find attached the explanation to the answer given.

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3 years ago
During a certain time interval, a constant force delivers an average power of 4 watts to an object. if the object has an average
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<span>Force = Work done / distance = 4Nm / 2m = 2N</span>
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3 years ago
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An electric field from a charge has a magnitude of 1.5 × 104 N/C at a certain location that points inward. If another charge wit
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Answer:

-0.045 N, they will attract each other

Explanation:

The strength of the electrostatic force exerted on a charge is given by

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3 years ago
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