The composition of a planet can be determined by

A) the Doppler technique.
B) astrometric measurements.
C) transit observations.
D) spectra.
E) all of the above

D

Physics & Space Science

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Whitney says that Gauss's law can be used to find the electric field of a sufficiently symmetrical distribution of charge as long as over the whole Gaussian surface. Algie says that the electric field must be a constant vector over the entire Gaussian surface. Which one, if either, is correct?

A.

Whitney, because that means no charge is enclosed within the Gaussian surface.

B.
Algie, because a constant electric field means that .

C.
Both, because the conditions in (a) and (b) are equivalent.

D.
Neither, because the electric field can be found from Gauss's law only if   holds only over a portion of the Gaussian surface.

E.
Neither, because the charge distribution must be symmetric if anywhere on the surface.

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If the value of H is doubled, it would also double the age of the universe

Indicate whether the statement is true or false

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13.0 g of water in a 3.25-L pressure vessel is heated to 480°C. What is the pressure inside the container? (R = 0.082 L/atm/mol/K, one mole of water has a mass of 18 grams)

a. 24.7 atm b. 13.7 atm c. 8.75 atm d. 15.7 atm e. 19.8 atm

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Two blocks of masses 20 kg and 8.0 kg are connected together by a light string and rest on a frictionless, level surface. Attached to the 8.0-kg mass is a second light string, which a person uses to pull both blocks horizontally. If the two-block system accelerates at 1.0 m/s2, what is the tension in the second string attached to the 8.0-kg mass?

a. 14 N c. 28 N b. 6.0 N d. 4.0 N

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Physics & Space Science