6. A roller coaster is designed so that the car is pulled up to the top of the first hill by a chain and
pulley system. After that, however, the car coasts the rest of the way through the track, never being
pulled or pushed again until its brakes stop it. Under these conditions, what is wrong with the roller
coaster designed below?

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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compass can be used day and night, cloudy or sunny

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me