Convection can occur
A) only in gases.
B) only in solids.
C) only in liquids.
D) only in liquids and gases.
E) in solids, liquids, and gases.
D
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Identify the FALSE statement. You could summarize our Solar System's development by saying:
it formed solely from atoms generated by the big bang. its formation began as gravity pulled material into a bulbous disc. the central ball of the bulbous disc developed into the Sun. outlying material of the disc condensed into planetesimals. planetesimals coalesced to form the planets.
Each y-direction force on frame ABCDEF below acts at the center of the bar segment to which it is applied. Support B is restrained against translation in the y and z directions only, and support C is restrained in the z direc- tion only. Support D is a pin support. Equilibrium of the frame requires that reaction force Cz is (in newtons):
(A) 80.8 N
(B) 67.7 N
(C) 14.8 N
(D) 92.2 N
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
What is the minimum energy needed to lift a 1.0-kg rocket to a height of 200 km and to give it a speed of 8.0 km/s at that height? (Neglect air resistance and the small decrease in g over that distance.)
A) 34 kJ B) 34 MJ C) 34 J D) 34 TJ E) 34 GJ