作业帮A 0.2 kg glass cup at 20 C is filled with 0.4 kg of hot wate
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A 0.2 kg glass cup at 20 C is filled with 0.4 kg of hot water at 70 C.Neglecting any heat losses to the environment,what is the equilibrium temperature?
heat capacity of water is 1000 cal/(kg·℃)
0.2*(T-20)*1000 = 0.4*(70-T)*1000
T=53.3°C
再问： A radio-controlled car increases its kinetic energy from 4 J to 12 J over a distance of 2 m. What was the average net force on the car during this interval?
再答： 12-4=8J 8/2=4N
0.2*(T-20)*1000 = 0.4*(70-T)*1000
T=53.3°C
再问： A radio-controlled car increases its kinetic energy from 4 J to 12 J over a distance of 2 m. What was the average net force on the car during this interval?
再答： 12-4=8J 8/2=4N
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