A lens is made with a focal length of -40 cm using a material with index of refraction 1.50. A second lens is made with the SAME GEOMETRY as the first lens, but using a material having refractive index of 2.00
What is the focal length of the second lens?
A) -80 cm B) -53 cm C) -30 cm D) -20 cm E) -40 cm
D
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What is the only known force that can overcome the repulsion between two positively charged nuclei and bind them together in a single nucleus?
A) the strong force B) the weak force C) the electromagnetic force D) the gravitational force E) the Coriolis force
Which planet is able to retain the largest (by radius and by volume)atmosphere?
a) Mars b) Jupiter c) Earth d) Venus e) Mercury
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 thick-ness 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 the aluminum to that in the copper is approximately:
(A) 0.6
(B) 0.8
(C) 1.0
(D) 1.5
If the mass of an object does not change, a constant net force on the object produces constant
A) velocity. B) acceleration. C) both of these D) none of the above