Question #346159

A scientist working late at night in her low-temperature physics laboratory decides to have a cup of hot tea, but discovers the lab hot plate is broken. Not to be deterred, she puts about 8.00 oz of water, at 12.0°C, from the tap into a lab dewar (essentially a large thermos bottle) and begins shaking it up and down. With each shake the water is thrown up and falls back down a distance of 31.3 cm.

 If she can complete 30 shakes per minute, how long will it take for the water to reach 77.1°C?



1
Expert's answer
2022-05-30T15:17:42-0400

Q0=2mgh,Q_0=2mgh,

Q=nQ0=cmt,Q=nQ_0=cm∆t,

n=cmt2mgh=ct2gh,n=\frac{cm∆t}{2mgh}=\frac{c∆t}{2gh},

T=nT0=ct2ghT0=24.7h.T=\frac n{T_0}=\frac{c∆t}{2ghT_0}=24.7^h.

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