Atrain leaves a station and travels north at 50 kmh four hours later a second train leaves on a paralel track and travels north at 90 km hr how far from the station will they meet?
to fa c e yourself with the problem complete the following chart
distance
rate
time
equation
slow train
fast train

Asmall (but heavy) particle placed in a glass of water will follow a zigzag motion because the particle will bounce off of the water molecules it meets. this is called brownian motion. a physicist simulates this on a computer, by varying the distance a particle can travel (called the mean free length), on average, before it collides with a water molecule and assigning the change in motion to be one of 8 directions, each with a similar probability. by running the simulated particle (with the same mean free length) many times she determines that it should take 15 seconds, on average, for the particle to fall to the bottom, with a standard deviation of 1.5 seconds. next she lets a real particle fall through a glass of water and finds that it took 18 seconds. what does she conclude, and why?

What are “like terms”? why can we only add like terms?

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