The observation of the moons of Jupiter by Galileo Galilei suggested that:
A) Earth could not move as its moon would be left behind.
B) the Solar System was actually geocentric.
C) Earth could move and keep its moon.
D) the only center of motion was Earth.
C
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Consider an object in orbit around a star. The star suddenly shrinks in size, but does not change its mass. What happens to the object's orbit?
A) It is instantly ejected from its orbit. B) It remains in the same orbit. C) It settles into a smaller orbit, with similar distance from the surface as the original orbit. D) It gradually spirals into the star.
Assuming that we can measure the apparent brightness of a star, what does the inverse square law for light allow us to do?
A) determine the distance to the star from its apparent brightness B) determine both the star's distance and luminosity from its apparent brightness C) calculate the star's surface temperature if we know either its luminosity or its distance D) calculate the star's luminosity if we know its distance, or calculate its distance if we know its luminosity
Which of the following is Jupiter's largest moon?
a. Io b. Europa c. Ganymede d. Callisto
The water behind Grand Coulee Dam is 1200 m wide and 160 m deep. Find the hydrostatic force on the back of the dam. (Hint: the total force = average pressure × area)
a. 5.2 × 10^9 N c. 13.2 × 10^10 N b. 8.8 × 10^10 N d. 15.1 × 10^10 N