Two isotopes have the same mass number
Indicate whether the statement is true or false
F
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Which of the following is the Sun predicted to do in the future based on theoretical models and observations of other stars?
A) The Sun will gradually get brighter over time. B) The Sun will gradually get dimmer over time. C) The Sun will maintain the same brightness during its entire lifetime. D) The Sun will gradually rotate faster. E) The Sun will get gradually closer to the Earth.
Geosynchronous satellites orbit at about four Earth radii, where the Earth's gravitational pull is:
A) 2 g. B) 1 g. C) 1/2 g. D) 1/4 g. E) 1/16 g.
You're driving in a car at 50 km/h and bump into a car ahead traveling at 48 km/h in the same direction. The speed of impact is
A) zero. B) 2 km/h. C) 48 km/h. D) 50 km/h. E) 98 km/h.
Which of the following best describes the inner workings of conductors?
1.Electrons collide at random, experiencing a net change of position equal to zero, except when exposed to an external electric field. 2.The electrons start at one electrode and travel directly to the other electrode, stopping there. 3.The electrons' drift speed depends only on the material of the conductor and not on the voltage difference applied to it. 4.None of these choices is correct.