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

Physics & Space Science

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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

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Why is it so difficult to remove the lid from a vacuum-sealed jar?

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Physics & Space Science

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.

Physics & Space Science