Mass on a Spring: A 4.8-kg block attached to an ideal spring executes simple harmonic motion on a frictionless horizontal surface. At time t = 0.00 s, the block has a displacement of -0.90 m, a velocity of -0.80 m/s, and an acceleration of +2.9 m/s2. The force constant (spring constant) of the spring is closest to
A. 15 N/m.
B. 14 N/m.
C. 13 N/m.
D. 12 N/m.
E. 11 N/m.
Answer: A
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Viscosity: A fluid is flowing with an average speed of 1.5 m/s through a tube that has a radius of 2.0 mm and is 18 cm long. The drop in pressure is 967 Pa. What is the viscosity of the fluid?
A. 0.0018 N ? s/m2 B. 0.0056 N ? s/m2 C. 0.028 N ? s/m2 D. 0.013 N ? s/m2 E. 0.0034 N ? s/m2
Why doesn't a brown dwarf become a star?
A) It does not have enough mass for its core to get hot enough to start fusion reactions before degeneracy pressure prevents further collapse. B) It always has a companion star that is hotter, and therefore, the brown dwarf is more like a planet than a star. C) It does not have enough heavy elements to start fusion reactions. D) Its luminosity is not high enough to qualify as an official star.
The typical density and temperature of molecular clouds are
A) 100 molecules per cubic centimeter, 10-30 Kelvin. B) 300 molecules per cubic centimeter, 10-30 Kelvin. C) 1000 molecules per cubic centimeter, 10-30 Kelvin. D) 100 molecules per cubic centimeter, 100-300 Kelvin. E) 300 molecules per cubic centimeter, 100-300 Kelvin.
Two sounds of the same intensity are added together. The intensity of the resulting sound is how much greater than the intensity of one of the original sounds?
1.It is the same intensity. 2.It is twice the intensity. 3.It is three times the intensity. 4.It is four times the intensity.