You see a crescent Moon setting after the Sun sets. Is it waning or waxing?

A) can't distinguish based on the information provided
B) waxing
C) waning


B

Physics & Space Science

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A sinusoidal electromagnetic wave in vacuum delivers energy at an average rate of 5.00 µW/m2

What are the amplitudes of the electric and magnetic fields of this wave? (c = 3.0 x 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)

Physics & Space Science

Intensity of Sound: What is the intensity of a 70-dB sound? The threshold of human hearing is 1.0 × 10-12 W/m2.

A. 10-4 W/m2 B. 10-5 W/m2 C. 10-6 W/m2 D. 10-7 W/m2

Physics & Space Science

Friction: A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30, and the coefficient of kinetic friction is 0.20. What horizontal force must be applied to the box to cause it to start sliding along the surface?

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

Physics & Space Science

The typical density for a rock found on the surface of Earth is ________ the average density of Earth overall.

A. about equal to B. greater than C. less than

Physics & Space Science