A boy on a bicycle approaches a brick wall as he sounds his horn at a frequency 400.00 Hz
The sound he hears reflected back from the wall is at a frequency 408.00 Hz. At what is the speed is the boy riding his bicycle toward the wall? Assume the speed of sound in air is 340 m/s.
A) 3.68 m/s
B) 333 m/s
C) 6.67 m/s
D) 6.80 m/s
E) 3.37 m/s
Answer: E
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____________________ formed as Mercury cooled and shrank
Fill in the blank(s) with correct word
Propped cantilever beam AB has moment M1 applied at joint B. Framework ABC has moment M2 applied at C. Both structures have constant flexural rigidity EI. If the ratio of the applied moments M1/M2 5 3/2, the ratio of the joint rotations at B, ?B1/?B2, is approximately:
(A) 1
(B) 3/2
(C) 2
(D) 5/2
About 2% of our solar nebula consisted of elements besides hydrogen and helium. However, the very first generation of star systems in the universe probably consisted only of hydrogen and helium
Which of the following statements is most likely to have been true about these first-generation star systems? A) There were no comets or asteroids in these first-generation star systems. B) Jovian planets in these first-generation star systems had clouds made of water and other hydrogen compounds. C) These first-generation star systems typically had several terrestrial planets in addition to jovian planets. D) Like the jovian planets in our solar system, the jovian planets in these first-generation systems were orbited by rings.
Research suggests that lead exposure leads to irremediable results, so that the best way to reduce lead levels is to remove lead-based materials. How realistic is such a tactic? Explain
What will be an ideal response?