Which one of the following IS a characteristic of Jovian planets?

a. low average density
b. orbits inside the asteroids
c. craters in old surfaces
d. small diameters
e. very few satellites


A

Physics & Space Science

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The area in the Sun's atmosphere located above the chromosphere (1,500-10,000 km) where the temperature rises dramatically is called the:

A) photosphere. B) corona. C) solar wind. D) transition zone. E) convection zone.

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A uniform rod is hinged to a wall and held at a 30° angle by a thin string that is attached to the ceiling and makes a 90° angle to rod. Which statement(s) must be true? (At least one of them is true and at least one is false.)

1.The hinge force is purely vertical. 2.The hinge force is purely horizontal. 3.The string tension is equal to the hinge force. 4.The string tension is smaller than the rod's weight. 5.1 and 3 are true. 6.2 and 3 are true. 7.1 and 4 are true. 8.2 and 4 are true. 9.3 and 4 are true. 10.Three of the statements are true.

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Gasoline yields 4.8 × 107 joules per kg when burned. The density of gasoline is approximately the same as that of water, and 1 gal = 3.8 L. How much energy does your car use on a trip of 100 mi if you get 25 mi per gallon?

What will be an ideal response?

Physics & Space Science

In a ruby laser, an electron jumps from a higher energy level to a lower one. If the energy difference between the two levels is 1.8 eV, what is the wavelength of the emitted photon?

A) 350 nm B) 470 nm C) 650 nm D) 690 nm E) 960 nm

Physics & Space Science