Earth has a radius of about 6400 km, the Sun has a radius of about 7.0×10^5 km, and a rubber ball has a radius of 6.4 cm. If you were to construct a scale model of the solar system using the rubber ball to represent Earth, what is the radius of a ball needed to represent the Sun in your model?
a. 7.0 × 10^5 cm
b. 7.0 cm
c. 700 cm
d. 70 cm
e. 7000 cm
c
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The Hipparcos satellite has extended our accurate parallax distance measurements to over 200 parsecs
Indicate whether the statement is true or false
This photo shows apparatus used in an experiment in which materials thought to have been present on the early Earth were sparked with energy. What have we learned from this type of experiment?
A) These experiments have shown that the building blocks of life form easily and naturally under conditions that existed on the early Earth. B) These experiments have told us the precise composition of Earth's early atmosphere. C) These experiments have shown us how life originated on Earth. D) These experiments have provided strong evidence for the idea that life first arose near volcanic vents at the bottom of the ocean.
Which of the following would be considered a physical property?
A) density B) flammability C) corrosion resistance D) reactivity towards acid E) oxygen sensitivity
Consider what happens when you jump up in the air. Which of the following is the most accurate statement?
A) It is the upward force exerted by the ground that pushes you up, but this force cannot exceed your weight. B) You are able to spring up because the earth exerts a force upward on you that is greater than the downward force you exert on the earth. C) Since the ground is stationary, it cannot exert the upward force necessary to propel you into the air. Instead, it is the internal forces of your muscles acting on your body itself that propels your body into the air. D) When you push down on the earth with a force greater than your weight, the earth will push back with the same magnitude force and thus propel you into the air. E) When you jump up the earth exerts a force F1 on you and you exert a force F2 on the earth. You go up because F1 > F2.