What are possible reasons that galaxies differ in form?
A.) Pre-galactic clouds have different densities.
B.) Pre-galactic clouds have different rotation rates.
C.) Galaxies collide with one another, creating different types.
D.) All of the above.
E.) A and B.
Ans: D.) All of the above.
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5.0 A at 110 V flows in the primary of a transformer. Assuming 100% efficiency, how many amps at 24 V can flow in the secondary?
A) 1.1 A B) 4.6 A C) 5.0 A D) 17 A E) 23 A
A 100-kg person sits on a 5-kg bicycle. The weight is borne equally by the two wheels of the bicycle. The tires are inflated to a gauge pressure of 8.0 x 105 Pa and are 2.0 cm wide. What length of each tire is in contact with the ground?
A) 1.6 cm B) 1.8 cm C) 3.2 cm D) 2.4 cm E) 6.4 cm
A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s2 . What is the time interval required for it to reach a 6.50-rad displacement after starting from rest?
a. 3.61 s b. 260 s c. 0.163 s d. 22.8 s
In Figure 5.14, the mass of block C is closest to:
A) 5 kg B) 7 kg C) 9 kg D) 11 kg E) 13 kg