The drawing shows two thermally insulated tanks. they are connected by a valve that is initially closed. each tank contains neon gas at the pressure, temperature, and volume indicated in the drawing. when the valve is opened, the contents of the two tanks mix, and the pressure becomes constant throughout.
(a) what is the final temperature? ignore any change in temperature of the tanks themselves. (hint: the heat gained by the gas in one tank is equal to that lost by the other.)
(b) what is the final pressure?

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."

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.

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