The concentric fringes, formed when a curved lens is placed on an optical flat, are called
A) Galileo circles.
B) Newton's rings.
C) Young's rings.
D) Faraday's circles.
E) Maxwell circles.
B
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Equilibrium: As shown in the figure, a woman is straining to lift a large crate, but without success because it is too heavy. We denote the forces on the crate as follows: P is the magnitude of the upward force being exerted on the crate by the person, C is the magnitude of the vertical contact force on the crate by the floor, and W is the weight of the crate. How are the magnitudes of these forces related while the person is trying unsuccessfully to lift the crate?
A. P + C = W B. P + C < W C. P + C > W D. P = C
What kind of gas is most affected by thermal escape?
A. greenhouse gases B. light gases C. all gases equally
What must be true in order for astronomers to be able to use the Doppler technique to determine a planet's mass?
A) The planet's orbit must be viewed nearly edge on. B) The planet must have a very low mass. C) The planet must have a very eccentric orbit. D) The planet's orbit must be seen nearly face on.
A "supernova" is
A) an exploding galaxy. B) an exploding star. C) a slight flare-up of an aged star. D) a new dance step. E) a large new star.