Exercise 3.3 C

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Specify the buoyant force.

Answer: $0{,}171\ N-\ 0{,}174\ N$

Exercise 3.3 D

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

In which liquid does the object have a greater buoyant?

Answer: Buoyant is greater in the first liquid, water.

Exercise 3.4 A

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Specify the density of a body? What kind of material is the body made of?

Answer: $2{,}7\ g / {cm}^3$

Exercise 3.4 B

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Specify the density of a body. What material could the body be?

Answer: $8{,}3\ g/{cm}^3 - 8{,}5\ g/{cm}^3$

Exercise 3.4 C

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Specify the density of a body. What kind of material is the body made of?

Answer: $7670\ kg/m^3 -\ 7820\ kg/m^3$

Exercise 3.4 D

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Specify the density of a body.

Answer: $2{,}8\ g/{cm}^3$

Exercise 3.4 E

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Determine the density of the liquid and the mass of the buret.

Tip: Derive the expression for the added mass as a function of depth and place the observation values (h, m) in the
coordinate system.
Answer: $m_{buret}=33\ g$; $990\ kg/m^3$

Exercise 3.4 F

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Determine the density of the weights. What material could the weight be?

Answer: $7700\ \frac{kg}{m^3}$

Exercise 3.4 G

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Determine the density of the unknown liquid.

How was the buoyant calculated?
Answer: $820\ \frac{kg}{m^3}$

Exercise 3.5 A

Difficulty Secondary School High school/other
★ Basic Easy
★★ Demanding Basic
★★★ Demanding
★★★★ Difficult
★★★★★ Very difficult

Specify the velocity of the puck.

Answer: $29\ m/s\ \left(\approx104\ km/h\right)$