What observational evidence supports the hypothesis that elliptical galaxies are born from relatively dense protogalactic clouds?

A) Elliptical galaxies have stars packed more densely together than spiral galaxies.
B) Elliptical galaxies are generally larger than spiral galaxies.
C) Even very distant elliptical galaxies tend to lack young, blue stars, indicating their stars formed early and rapidly.
D) Elliptical galaxies have more and denser gas than spiral galaxies.
E) The stars in elliptical galaxies are denser than those in spiral galaxies.


C) Even very distant elliptical galaxies tend to lack young, blue stars, indicating their stars formed early and rapidly.

Physics & Space Science

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A. 7.09 × 10-8 T B. 5.02 × 10-8 T C. 3.55 × 10-8 T D. 9.81 × 10-8 T E. 1.42 × 10-7 T

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Two mirrors are at right angles to one another. A light ray is incident on the first at an angle of 30° with respect to the normal to the surface. What is the angle of reflection from the second surface?

a. 30° b. 60° c. 45° d. 53° e. 75°

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A bulldozer attempts to drag a log weighing 500 N along the rough horizontal ground. The cable attached to the log makes an angle of 30° above the ground. The coefficient of static friction between the log and the ground is 0

50, and the coefficient of kinetic friction is 0.35. What minimum tension is required in the cable in order for the log to begin to slide?

Physics & Space Science

No device is possible whose sole effect is to transform a given amount of heat completely into work

Indicate whether the statement is true or false

Physics & Space Science