A student places a steak on one side of a double balance pan. She adds weights of known mass to the other side until both sides balanced

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

compass can be used day and night, cloudy or sunny

amplitude

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