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