All globular clusters in our Milky Way are about how old?
A) less than a million years
B) ten-fifty million years old
C) one to three billion years old
D) around ten billion years old
E) a variety of ages, from newly born to twenty billions years old
D
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Mercury has only a trace atmosphere because
A. its slow rotation allows atmospheric gases to escape the planet. B. its close proximity to the Sun allows the Sun to gravitationally pull gases directly off the surface of Mercury. C. impacts from planetesimals caused its original atmosphere to evaporate away. D. its smaller size means it has gravitational attraction that is too weak to hold onto an atmosphere.
What is the sum of 1.53 + 2.786 + 3.3 expressed to the correct number of significant figures?
A) 7 B) 7.6 C) 7.62 D) 7.616 E) 7.6160
A 6.0 kg box is held at rest by two ropes that form 30° angles with the vertical. An external force F acts vertically downward on the box. The force exerted by each of the two ropes is denoted by T
A force diagram, showing the four forces that act on the box in equilibrium, is shown in Figure 5.6. The magnitude of force F is 410 N. The magnitude of force T is closest to: A) 271 N B) 235 N C) 188 N D) 376 N E) 470 N
Calculate the percentage composition by mass (to the nearest 0.1) of each element in aspirin, C9H8O4