Engineers are designing a curved section of a highway. If the radius of curvature of the curve is at what angle should the curve be banked so that a car traveling at 29.0 m/s will stay on the road without the aid of frictional forces?
A) 23.9°
B) 16.7°
C) 21.0°
D) 26.1°
Answer: A
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Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.Linear momentum __________ conserved
Fill in the blank(s) with correct word
Earth's original atmosphere was
A) very similar to the atmosphere we have today. B) rich in both O2 and O3. C) obliterated after the birth of the Sun. D) a mixture of N2, CO2, and O3.
Consider two identical and symmetrical wave pulses on a string. Suppose the first pulse reaches the fixed end of the string and is reflected back and then meets the second pulse. When the two pulses overlap exactly, the superposition principle predicts that the amplitude of the resultant pulses, at that moment, will be what factor times the amplitude of one of the original pulses?
a. 0 b. 1 c. 2 d. 4
Why is Neptune denser than Saturn?
A) It has a different composition than Saturn, including a higher proportion of hydrogen compounds and rocks. B) It has a greater proportion of hydrogen than Saturn. C) The extra mass of Neptune compresses its interior to a greater extent than that of Saturn. D) Its hydrogen is molecular, whereas Saturn's hydrogen is atomic. E) It is not denser than Saturn.