When a laboratory sample of unknown mass is placed on a vertical spring-scale having a spring constant of 467 N/m, the system obeys the equation y = (4.4 cm) cos(33.3 s-1 t). What is the mass of this laboratory sample?
What will be an ideal response?
0.421 kg
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Each box in this figure represents a different level of structure in our universe. Each box is labeled with one of the numbers 1—5. Which box represents the Milky Way Galaxy?
A) 1 B) 2 C) 3 D) 4 E) 5
The intensity of the waves from a point source at a distance d from the source is I. What is the intensity at a distance 2d from the source?
A) 4I B) 2I C) I/2 D) I/4 E) I/
In the accompanying figure, which region represents approximately 80 percent of normal stars? Note: (C) represents the entire main sequence while (D) and (E) represent only small parts of the main sequence.
Which of the following is not a major idea of Einstein's general theory of relativity?
A) It is possible to travel through wormholes. B) Time runs slower near strong gravitational fields. C) Our universe can have no center or boundaries, yet be finite. D) Black holes can exist in spacetime, and falling into a black hole means leaving the observable universe. E) Large masses that undergo rapid changes in motion or structure can emit gravitational waves that travel at the speed of light.