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
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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
In chemistry, oxidation occurs when a substance
A) loses electrons B) rearranges its electrons internally C) accepts electrons D) breaks into its constituent atoms
Which of the following contains the most energy per gram?
A. TNT B. chocolate chip cookies C. battery D. uranium
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