Answer the following statement(s) true (T) or false (F)
1. Suppose that a gas expands in a cylinder, pushing back a piston with a speed of 20 m/s (about 45 mi/h). We can reasonably consider such an expansion to be quasistatic.
2. In a tub, 100 kg of water at 30°C absorbs 100 J from an electric heater. We can reasonably consider the water to be a reservoir in this process.
1. TRUE
2. TRUE
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The _____ is an imaginary sphere of very large radius surrounding Earth to which the planets, stars, Sun, and Moon seem to be attached
A) galactic sphere B) celestial sphere C) equatorial sphere D) lunar sphere
The last quasar probably died out a billion years ago, for none lie within a billion light years of us
Indicate whether the statement is true or false
When atom A loses an electron to atom B,
A) atom A becomes more negative than atom B. B) atom A acquires more neutrons than atom B. C) atom A acquires less neutrons than atom B. D) atom A becomes a positive ion and atom B becomes a negative ion. E) atom A becomes a negative ion and atom B becomes a positive ion.
You are standing near a railroad track and a train is moving toward you at 60 mph and blowing its horn. What will you notice as the train moves past you?
a. As the train approaches, the horn will sound lower in pitch than when the train is moving away. b. As the train approaches, the horn will sound higher in pitch than when the train is moving away. c. There will be no change in the pitch of the horn as it moves by. d. The horn will get louder as the train moves away from you. e. The horn will get quieter as the train moves toward you.