Constructive interference is a result of two waves arriving at a point ________.

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


in phase

Physics & Space Science

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To explain the retrograde motion of planets, Ptolemy introduced the concept of ________.

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

Physics & Space Science

The major processes that heat the interiors of the terrestrial worlds are

A) (1 ) Heat deposited as the planets were built from planetesimals; (2 ) heat of accretion; (3 ) heat that came from the gravitational potential energy of incoming planetesimals. B) (1 ) Heat of accretion; (2 ) heat from convection; (3 ) heat from thermal radiation. C) (1 ) Heat deposited as the planets were built from planetesimals; (2 ) heat deposited as the planets underwent differentiation; (3 ) heat released by radioactive decay. D) (1 ) Volcanism; (2 ) tectonics; (3 ) erosion.

Physics & Space Science

The wind speed of the air flowing over a 16-cm-diameter outside mirror is significantly higher than the speed of a vehicle. If the pressure on the front of the mirror is assumed to be stagnation pressure and the pressure on the rear is assumed to be atmospheric, the power needed to move the mirror, if the air velocity around the mirror is 30 m/s, is nearest:

(A) 0.44 hp (B) 0.39 hp (C) 0.34 hp (D) 0.29 hp

Physics & Space Science

The helium flash is followed within a few million years by the Type II supernova

Indicate whether the statement is true or false

Physics & Space Science