Pathways to Astronomy

Stephen E. Schneider

Chapter 4 Foundations of Astronomy - all with Video Answers

Educators

Chapter Questions

Problem 1

Make a hypothesis about the cause of some weather phenomenon you have observed. For example, what produces lightning or hail? Describe the different observations you are familiar with that support your hypothesis. What experiment could be conducted that could disprove your hypothesis?

David Collins

Numerade Educator

01:45

Problem 2

If an atom were the size of a city (10 $\mathrm{km}$ across), how large would a proton be?

Wan Deng

Numerade Educator

01:24

Problem 3

Imagine that the Earth and the Moon were both positively charged by an amount proportional to their masses, so that their electrical repulsion canceled out their gravitational attraction. Using the relative strengths of gravity and the electromagnetic force, how much mass in the Earth would have to be positively charged?

Ajay Singhal

Numerade Educator

01:23

Problem 4

Explain at a fundamental level what is happening when you take clothes out of a dryer and find them clinging to each other. What do you think is happening when you hear a crackling sound as you pull a sock and shirt apart?

Ankur S

Numerade Educator

01:51

Problem 5

If the strong force grows larger with distance, explain why the force is limited in its range to acting within the atomic nucleus.

Joseph Fritchman

Numerade Educator

01:25

Problem 6

It is estimated that a neutrino has to pass within a distance of about $10^{-24}$ meters of a quark for a high likelihood of interaction. If an atom has a radius of $10^{-10}$ meters and 12 nuclear particles in its nucleus, what is the probability that a neutrino passing through an atom will undergo an interaction? (Hint: Think of the atom as a target and the area around each quark as a bull's-eye.)

Penny Riley

Numerade Educator