Exercise 1.1 A

DifficultySecondary SchoolHigh school/other
★BasicEasy
★★DemandingBasic
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★★★★Difficult
★★★★★Very difficult

How much does the measured final temperature differ from the theoretically predicted final temperature (in degrees)?

Answer: $-0{,}3\ °C$; Note: Calculating the formula $m_1c∆t_1=m_2c∆t_2$, the final temperature should be about $40{,}72\ °C$ and the difference in degrees about $-0{,}2\ °C$

Exercise 1.1 B

DifficultySecondary SchoolHigh school/other
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★★DemandingBasic
★★★Demanding
★★★★Difficult
★★★★★Very difficult

How much does the measured final temperature differ from the theoretically predicted final temperature (in degrees)?

Answer: 0,2 °C

Exercise 1.1 C

DifficultySecondary SchoolHigh school/other
★BasicEasy
★★DemandingBasic
★★★Demanding
★★★★Difficult
★★★★★Very difficult

How much water (colder water) was there in the beginning?

Answer: 280 g

Exercise 1.1 D

DifficultySecondary SchoolHigh school/other
★BasicEasy
★★DemandingBasic
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★★★★Difficult
★★★★★Very difficult

What was the temperature of the hotter water at the beginning?

Answer: 69 °C

Exercise 1.1 E

DifficultySecondary SchoolHigh school/other
★BasicEasy
★★DemandingBasic
★★★Demanding
★★★★Difficult
★★★★★Very difficult

Specify the specific heat capacity of copper.

Answer: $0,39\frac{kJ}{kg \cdot °C}$

Exercise 1.1 F

DifficultySecondary SchoolHigh school/other
★BasicEasy
★★DemandingBasic
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★★★★Difficult
★★★★★Very difficult

Specify the thermal efficiency of the kettle.

Answer: 0,79

Exercise 1.1 G

DifficultySecondary SchoolHigh school/other
★BasicEasy
★★DemandingBasic
★★★Demanding
★★★★Difficult
★★★★★Very difficult

Determine the highest and lowest temperature of the day and also temperature at the moment of measurement.

Answer: $t_{highest}=38\ °C$
$t_{lowest}=23\ °C$
$t_{at\ the\ time\ of\ measurement}=27\ °C$