What condition or conditions is/are necessary for rotational equilibrium?
A) ?Fy = 0
B) ?Fx = 0, ?Fy = 0
C) ?? = 0
D) ?Fx = 0
E) ?Fx = 0, ?Fy = 0, ?? = 0
C
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You find a rock containing radioactive potassium-40 and its decay product argon-40. You assume that all the argon-40 was made from radioactive decay of potassium-40. The rock now has twice as much argon-40 as potassium-40; that is, 2/3 of the original potassium-40 has decayed into argon-40, whereas 1/3 remains in the rock. Based on this graph, about how old is the rock?
A) 1 billion years B) 1.25 billion years C) 2 billion years D) 2.5 billion years
From Earth, the view of the Milky Way is a thin band of stars across the night sky. The part of the Milky Way galaxy that is described here is the:
A) bulge. B) spiral arm. C) disk. D) halo. E) globular cluster.
The Kelvin form of the second law of thermodynamics states that
A. an engine can take heat from a single reservoir and convert it all to work B. no engine can take heat from a single reservoir and convert it all to work C. an engine can have a greater efficiency than a Carnot engine
If the ground state energy level of an electron in a rigid box is 5.0 eV, what is the width of the box?
A) 2.3 × 10-11 m B) 7.3 × 10-20 m C) 2.7 × 10-10 m D) 1.0 × 10-10 m E) 9.1 × 10-21 m