What happens to the atomic number (Z) and the mass number (A) when a nucleus emits an alpha particle?
a. Z increases by 1; A is unchanged.
b. Z is unchanged; A is unchanged.
c. Z decreases by 2; A decreases by 4.
d. Z decreases by 1; A is unchanged.
c
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Which of the following best describes the web design concept of alignment?
A. A contrast between light and dark colors. B. The trend of using RWD to determine layout. C. The placement of objects in fixed or predetermined positions, rows, and columns. D. Meeting target audience expectations.
A 1.0 kg flashlight falls to the floor. At the point during its fall when it is 0.70 m above the floor, its potential energy exactly equals its kinetic energy. How fast is it moving?
A) 3.7 m/s B) 6.9 m/s C) 14 m/s D) 45 m/s E) 9.8 m/s
Why is it so difficult to remove the lid from a vacuum-sealed jar?
A) The air pressure outside the jar pushes downward on the lid more strongly than the air pressure inside pushes upward on the lid. B) The higher pressure inside the jar pulls inward on the lid, holding it firmly to the jar. C) The vacuum inside the jar pulls inward on the lid, holding it firmly to the jar. D) The vacuum inside the jar pushes outward on the lid, holding it firmly to the jar. E) The air pressure inside the jar pushes upward on the lid more strongly than the air pressure outside pushes downward on the lid.
In a large tank of liquid, the hydrostatic pressure at a given depth is a function of
a. depth. b. surface area. c. liquid density. d. Choices a and c are both valid.