Give at least two advantages of the Kelvin temperature scale for astronomers
What will be an ideal response?
It is an absolute scale, so there are never any negative readings. Wein's and Stefan's laws are only mathematically correct if Kelvin temperatures are used.
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Vector V1 is (5i + 7j - 3k) and vector V2 is (7i + 2 j + 14k). The component of V1 parallel to the line of action of vector V2 is:
(A) -0.25i + 0.12j + 0.43k (B) 0.20i + 0.06j + 0.39k (C) -0.20i + 0.22j + 0.39k (D) -0.35i + 0.02j + 0.13k
A bucket in an old well is hoisted upward by a rope which winds up on a cylinder having a radius of 0.050 m. How many rev/s must the cylinder turn if the bucket is raised at a speed of 0.250 m/s?
a. 5.00 rev/s b. 7.85 rev/s c. 1.59 rev/s d. 0.80 rev/s e. 3.18 rev/s
A thin converging lens is found to form an image of a distant building 24 cm from the lens. If an insect is now placed 16 cm from this lens, how far FROM THE INSECT will its image be formed?
A) 96 cm B) 32 cm C) 48 cm D) 64 cm E) 72 cm
For a beam of light, the direction of polarization is defined as
A) the beam's direction of travel. B) the direction of the electric field's vibration. C) the direction of the magnetic field's vibration. D) the direction that is mutually perpendicular to the electric and magnetic field vectors.