A roller-coaster car has a mass of 500 kg when fully loaded with passengers. The car passes over a hill of radius 15 m, as shown. At the top of the hill, the car has a speed of 8.0 m/s. What is the force of the track on the car at the top of the hill?
a.
7.0 kN up
b.
7.0 kN down
c.
2.8 kN down
d.
2.8 kN up
e.
5.6 kN down
d
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the mass of the earth is 
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a. 78 J b. 82 J c. 85 J d. 74 J e. 43 J
On average, the Milky Way forms about ________ stars per year
Fill in the blank(s) with correct word