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

Physics & Space Science

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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

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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

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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

Physics & Space Science

Which planet is able to retain the largest (by radius and by volume)atmosphere?

a) Mars b) Jupiter c) Earth d) Venus e) Mercury

Physics & Space Science