In the context of the Hertzsprung-Russell (H-R) diagram, which of the following statements is true of the most massive main-sequence stars?

A) They are the reddest stars.
B) They are the coolest stars.
C) They are the hottest stars.
D) They are the faintest stars.


C

Physics & Space Science

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A 1.6-kg block on a horizontal frictionless surface is attached to an ideal massless spring whose spring constant is 190 N/m

The block is pulled from its equilibrium position at x = 0.00 m to a displacement x = +0.080 m and is released from rest. The block then executes simple harmonic motion along the horizontal x-axis. What is the velocity of the block at time t = 0.40 s? A) 0.82 m/s B) -0.82 m/s C) 0.30 m/s D) -0.30 m/s E) 0.00 m/s

Physics & Space Science

In chemistry, oxidation occurs when a substance

A) loses electrons B) rearranges its electrons internally C) accepts electrons D) breaks into its constituent atoms

Physics & Space Science

Which of the following contains the most energy per gram?

A. TNT B. chocolate chip cookies C. battery D. uranium

Physics & Space Science

A thin sheet of plastic (n = 1.60) is inserted between two panes of glass to reduce infrared (? = 700 nm) losses. What thickness (in nm) is necessary to produce constructive interference in the reflected infrared radiation?

A. 218 B. 109 C. 55 D. 318 E. 443

Physics & Space Science