As life on Earth evolved, its DNA

A) changed gradually into RNA
B) stayed the same
C) became gradually less complex
D) became gradually more complex


D

Physics & Space Science

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RLC Circuits: A 120-V rms voltage at 1.0 kHz is applied to a 2.0-mH inductor, a 4.0-?F capacitor and a resistor. If the rms value of the current in this circuit is 0.40 A, what is the value of the resistor?

A. 300 ? B. 95 ? C. 420 ? D. 120 ? E. 240 ?

Physics & Space Science

Each rolling wheel of a railroad train is tapered. Compared with the wide part, the narrow part of the wheel has a tangential speed that is

A) less. B) greater. C) the same for both.

Physics & Space Science

Astronaut Jennifer's lifeline to her spaceship comes loose and she finds herself stranded, "floating" 100 m from the mothership. She suddenly throws her 2.00-kg wrench at 20 m/s in a direction away from the ship

If she and her spacesuit have a combined mass of 200 kg, how long does it take her to coast back to her spaceship? A) 1000 s B) 750 s C) 500 s D) 250 s E) 2.50 min

Physics & Space Science

A ray of light traveling through water passes through an air bubble. Which path does it take?

A. A B. B C. C D. D E. E

Physics & Space Science