The nuclide at the top of the "relative stability of nucleus versus mass number" curve is
a. iron-56.
b. uranium-235.
c. uranium-238.
d. helium-4.
a
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An organ pipe is 80.0 cm long and is open at one end and closed at the other. The frequency of the third mode is 200 Hz higher than the frequency of the second mode. What is the velocity of sound?
A. 300 m/s B. 320 m/s C. 340 m/s D. 360 m/s E. 380 m/s
The fact that nearly all galaxies are moving away from us, with more distant ones moving faster, helped us to conclude that:
a. The universe is expanding. b. Galaxies repel each other like magnets. c. Our galaxy lies near the center of the universe.
What change slowly occurs during the main-sequence lifetime of a star?
A) As hydrogen is used up in the core, the fusion rate decreases and reduces the luminosity. B) It gathers more gas from interstellar space, increasing its mass and hence the luminosity. C) Its core temperature slowly increases, increasing the fusion rate and hence the luminosity. D) As the solar wind blows material into space, the decreasing mass reduces pressure in the core, which in turn reduces the fusion rate and the luminosity.
The small piston of a hydraulic lift has a diameter of 8.0 cm, and its large piston has a diameter of 40 cm. The lift raises a load of 15,000 N. Assume the pistons each have negligible mass
(a) Determine the force that must be exerted by the fluid in the lift on the small piston. (b) Determine the pressure applied to the fluid in the lift.