Why does the electric force dominate at the atomic scale while the gravitational force dominates on the large scale that includes the solar system and beyond?
a. Atoms have no net charge, making electrical forces within atoms negligible.
b. There is no gravitational force within atoms, because the law of gravitation applies only to large objects.
c. Atomic particles have too little mass for gravitational attraction to compete with electric forces.
d. At large distances, individual charges have essentially no effect since, overall, atoms are electrically neutral.
e. Both c. and d.
e
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Which of the following best describes the axes of a Hertzsprung-Russell (H-R) diagram?
A) mass on the horizontal axis and luminosity on the vertical axis B) surface temperature on the horizontal axis and luminosity on the vertical axis C) mass on the horizontal axis and stellar age on the vertical axis D) interior temperature on the horizontal axis and mass on the vertical axis E) surface temperature on the horizontal axis and radius on the vertical axis
Arnold Strongman and Suzie Small each pull on opposite ends of a rope in a tug-of-war. The greater force on the rope is exerted by
A) Arnold. B) Suzie. C) same by each
When the frequency of the source of a water wave increases, the distance between successive peaks in the wave increases
a. True b. False Indicate whether the statement is true or false
An electron with an energy of 20 GeV (3.20 × 10-9 J) moving in the +x direction collides head on with a stationary proton. After the collision, the electron travels in the -x direction
What is the momentum of the electron after the collision? Note that this is an ultrarelativistic collision so that the energy of the moving masses can be approximated by the expression E ? pc. The mass of a proton is 1.67 × 10-27 kg and that of an electron is 9.11 × 10-31kg. A) 2.5 × 10-19 kg?m/s B) 5.0 × 10-19 kg?m/s C) 1.1 × 10-17 kg?m/s D) 2.2 × 10-17 kg?m/s E) 2.7 × 10-22 kg?m/s