A bimetallic beam of aluminum (Ea 5 70 GPa) and copper (Ec 5 110 GPa) strips has a width of b 5 25 mm; each strip has a thickness of t 5 1.5 mm. A bending moment of 1.75 N?m is applied about the z axis. The ratio of the maximum stress in aluminum to that in copper is approximately:
(A) 0.6
(B) 0.8
(C) 1.0
(D) 1.5
(B) 0.8
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A monatomic gas is cooled by 50 K at constant volume when 831 J of energy is removed from it. How many moles of gas are in the sample?
A) 2.50 mol B) 2.15 mol C) 1.50 mol D) 1.33 mol E) none of the above
The focal lengths of the objective and eyepiece in a compound microscope are 0.50 cm and 2.00 cm, respectively. An object is placed at a distance of 0.52 cm from the objective
If the final image seen by the eye is at a distance of 25 cm from it, what is the magnification? A) -125 B) -100 C) -225 D) -325 E) -425
Rank the following 4 items in order of increasing density (low to high)
A) black hole singularity, main-sequence star, white dwarf, neutron star B) main-sequence star, neutron star, white dwarf, black hole singularity C) main-sequence star, white dwarf, neutron star, black hole singularity D) main-sequence star, black hole singularity, neutron star, white dwarf
A blimp is filled with 440 m3 of helium. How big a payload can the balloon lift? (The density of air is 1.29 kg/m3; the density of helium is 0.178 kg/m3.)
a. 396 kg b. 568 kg c. 78.3 kg d. 489 kg e. 646 kg