Which of the following is an example of a scientific model?
a. celestial sphere b. connected balls and rods representing chemical bonds of a DNA molecule
c. topographical map d. All of the other choices are correct.
d
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A region of ionized gas and dust, with imbedded hot young stars, is a(n)
A) emission nebula. B) dust cloud. C) dark nebula. D) nebular hole. E) absorption nebula.
How do we determine the amount of dark matter in elliptical galaxies?
A) We measure the orbital velocities of star-forming gas clouds around the outer portions of the galaxy. B) We measure the range of speeds of collections of stars at different distances from the galactic center and determine how much mass is interior to their orbits. C) We count the number of stars in the galaxy and determine its volume, so that we can calculate the galaxy's density. D) We search for dark lanes of dust and black holes within the galaxy. E) We measure how fast the galaxy rotates as a whole.
The parallel-axis theorem can be applied only to flat objects
Indicate whether the statement is true or false
A 50-kg bucket of concrete is suspended from a steel wire that is 1.0 mm in diameter 1.0 mm and 11.2 m long. What distance will the wire stretch? Young's modulus for steel is 2.0 x 1011 Pa
What will be an ideal response?