Give the dimensions and shape of the Galactic disk
What will be an ideal response?
The entire disk is about 30 kpc across, very flat, and at our distance from the center, only about 300 pc thick. It bulges thicker as you approach the center.
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Based on what you have learned from your rankings in Parts A and B which statement best describes how variation in the Earth-Sun distance affects the seasons?
A. No matter where you live or what the seasons, it is generally hotter when Earth is closer to the Sun and colder when Earth is farther from the Sun. B. The variation in Earth-Sun distance over the course of each year has virtually no effect on the seasons. C. Summer occurs when Earth is closer to the Sun and winter occurs when Earth is farther from the Sun
The vertical height attained by a basketball player who achieves a hang time of a full 1 s is about
A) 0.8 m. B) 1 m. C) 1.2 m. D) 2.5 m. E) more than 2.5 m.
Three point charges are located at the following positions: Q1 = 2.00 ?C at x = 1.00 m; Q2 = 3.00 ?C at x = 0; Q3 = -5.00 ?C at x = -1.00 m. What is the magnitude of the force on the 3.00-?C charge?
A) 5.40 × 10-2 N B) 0.135 N C) 0.158 N D) 8.10 × 10-2 N E) 0.189 N
A heat engine receives 7 900 J of heat from its combustion process and loses 3 200 J through the exhaust and friction. What is its efficiency?
a. 59% b. 35% c. 21% d. 41% e. 77%