【物理】problems about heat conduction and coefficients of expansion

[breathe939 10]

As you read this problem, your brain is consuming about 21.7 W of power.

(a) How many steps with a height of 22.3 cm must a person of mass 62 kg climb to expend a mechanical energy equivalent to one hour of brain operation?

steps

(b) A typical human brain, which is 77% water, has a mass of 1.4 kg. Assuming that the 21.7 W of brain power is converted to heat, what temperature rise would you estimate for the brain in one hour of operation? Ignore the significant heat transfer that occurs between a human head and its surroundings, as well as the 23% of the brain that is not water.

°C

有人可以教我這兩題嗎

(A) 是不是用 momentum * time = mass* constant * change in temperature

但是後面是問 STEPS 那是怎樣 我一頭霧水

[九天驚虹 10]

As you read this problem, your brain is consuming about 21.7 W of power.

(a) How many steps with a height of 22.3 cm must a person of mass 62 kg climb to expend a mechanical energy equivalent to one hour of brain operation?

steps

這題只要根據題意列出方程式就好

列出功率21.7瓦特 在一個小時內 有多少功 ... (1式)

然後呢 列出該人往上走一步所需要的能量 我想應該不難想到 就是 mgh

最後呢 題目要問走了幾步 就假設x步

因此 x*mgh = (1式) 解x

[九天驚虹 10]

As you read this problem, your brain is consuming about 21.7 W of power.

(b) A typical human brain, which is 77% water, has a mass of 1.4 kg. Assuming that the 21.7 W of brain power is converted to heat, what temperature rise would you estimate for the brain in one hour of operation? Ignore the significant heat transfer that occurs between a human head and its surroundings, as well as the 23% of the brain that is not water.

°C

這也只要循著題目的敘述列出方程式 就能有答案

我想問題應該不會是看不懂英文吧:)