As the sloped surface supporting a shoe becomes steeper
A) the shoe's weight mg remains unchanged.
B) the normal force becomes less.
C) friction needed to keep it at rest increases.
D) all of the above
E) none of the above
Answer: D
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Concrete is a composite with a matrix of hydrated _________cement, and the reinforcement is aggregate with sizes ranging from fine sand to coarse rocks.
Fill in the blank(s) with the appropriate word(s).
Which of the following types of electromagnetic radiation has the lowest energy?
a. X-rays b. visible light c. ultraviolet d. gamma rays e. infrared radiation
Cosmic rays are electromagnetic radiation
a. True b. False Indicate whether the statement is true or false
What evidence supports the theory that elliptical galaxies come from denser clouds?
A) Elliptical galaxies are denser than spiral galaxies. B) Elliptical galaxies are generally larger than spiral galaxies. C) Elliptical galaxies at high redshifts lack young, blue stars. D) Elliptical galaxies have more gas than spiral galaxies. E) Elliptical galaxies have denser stars than spiral galaxies.