The brightest stars of a young open cluster will be:
A) Cepheid variables.
B) massive blue main sequence stars.
C) red giants.
D) yellow main sequence stars like the Sun.
E) T Tauri variables.
B
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Which source generates the most energy over its lifetime?
A) A supernova. B) A gamma-ray burst. C) A quasar. D) The Sun. E) A camp fire.
Refer to Figure 6-13. Block A has a mass of 3.00 kg, block B has a mass of 5.00 kg and block C has a mass of 2.00 kg. The pulleys are ideal and there is no friction between block B and the table. What is the acceleration of the masses?
A. 4.20 m/s2 B. 4.71 m/s2 C. 1.86 m/s2 D. 2.94 m/s2 E. 0.981 m/s2
A bucket in an old well is hoisted upward by a rope which winds up on a cylinder having a radius of 0.050 m. How many rev/s must the cylinder turn if the bucket is raised at a speed of 0.15 m/s?
a. 3.0 rev/s b. 1.5 rev/s c. 0.48 rev/s d. 0.24 rev/s
How was the value of G first determined?
a. by Cavendish, using a torsion balance b. by Eötvös, using a torsion balance c. via a gedanken experiment d. by Newton, watching an apple fall e. none of the above