The planet COROT-14b is only slightly larger than Jupiter, but is several times more massive. Which is the most plausible explanation for its similar size to Jupiter?
A) Planets that are close to a star are heated up and therefore larger.
B) The mass measurement is mistaken, and it is actually about 10 times more massive than Jupiter.
C) It is made of elements other than hydrogen and helium which do not compress under their own gravity.
D) The hydrogen and helium gas compressed even under their own gravity to a higher density than Jupiter.
D
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Number 10 copper wire (radius = 1.5 mm) is commonly used for electrical installations in homes. What is the voltage drop in 20 m of #10 copper wire if it carries a current of 12 A? (The resistivity of copper is 1.7 × 10^?8 ??m.)
a. 0.58 V b. 0.48 V c. 2.7 V d. 2.4 V e. 0.34 V
A metal surface has a work function of 2.50 eV
What is the longest wavelength of light that will eject electrons from the surface of this metal? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A slab of material 1 rests on the surface of a slab of material 2 . A light ray in material 1 has an angle of incidence of 30° on the interface between the materials, while the ray in material 2 has an angle of refraction of 45°. What is the critical angle of incidence for total internal reflection for a ray of light going from material 2 to material 1?
a. 30° b. 45° c. In this case there is no critical angle. d. At least one of the indices of refraction or its equivalent is needed to solve this problem.
Modern astronomers have observed the complete life cycle for many stars, making stellar evolution one of the best-tested astronomical theories
Indicate whether the statement is true or false