Which of the following is true of Mars?

A) It is about 95 percent of Earth's diameter.
B) It has a thick atmosphere rich in water vapor.
C) It is the smallest planet of the Solar System.
D) It has a heavily cratered crust marked by volcanoes.


D

Physics & Space Science

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Wave Characteristics: An FM radio station broadcasts at 96.7 MHz. What is the wavelength of the radio wave used for this broadcast? (c = 3.0 × 108 m/s)

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

Nitrogen at 30°C and atmospheric pressure enter a triangular duct 0.02 m on each side at a rate of 4 × 10–4 kg/s. If the duct temperature is uniform at 200°C, estimate the bulk temperature of the nitrogen 2 m and 5 m from the inlet.

GIVEN
• Atmospheric nitrogen flowing through a triangular duct
• Bulk inlet temperature (Tb,in) = 30°C
• Width of each side of the duct (w) = 0.02 m
• Mass flow rate (m ) = 4 × 1–4 kg/s
• Duct temperature (Ts) = 200°C (uniform)
FIND
• The bulk temperature
(a) 2 m from the inlet and,
(b) 5 m from the inlet
SKETCH

Physics & Space Science

All of the following are true. Which of these gives evidence that quasars were more common when the universe was young than they are today?

A) They are more common at very great distances. B) They are very bright. C) They are active galactic nuclei. D) We don't see them in every galaxy.

Physics & Space Science

A wave pulse on a string whose end is fixed is reflected without inversion

Indicate whether the statement is true or false

Physics & Space Science