The time derivative of a vector is a:
A. Either a scalar or a vector.
B. Tensor.
C. Scalar.
D. Vector.
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Why do disks form around young stars?
A) The surrounding gas can only approach the star from a single direction. B) Collisions between gas particles flatten the rotating gas cloud. C) The rotation of the cloud causes gas to be spun outward from the central star. D) Intense winds from nearby massive stars flatten the gas cloud.
If the same quantity of heat is added to both a 2-liter and a 4-liter container of water, the temperature change in the 4-liter container will be
A) less. B) the same. C) greater.
Calculate the light intensity 1.45 m from a light bulb that radiates 100 W equally in all directions
A) 3.78 W/m2 B) 4.36 W/m2 C) 47.6 W/m2 D) 54.7 W/m2
Chromatic aberration is absent in
A) converging lenses B) diverging lenses. C) front surface plane mirrors.