Exercise 3.7 A

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

In what direction is the elevator going? Also specify the maximum acceleration of the elevator at the beginning and in the end.

Answer: The elevator's maximum acceleration is at the beginning $0,39\ m/s^2$ and in the end $-0,47\ m/s^2$

Exercise 3.7 B

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

In what direction is the elevator going? Also specify the maximum acceleration of the elevator at the beginning and in the end.

Answer: The elevator's maximum acceleration is at the beginning $0{,}39\ m/s^2$ and in the end $-0{,}39\ m/s^2$

Exercise 3.7 C

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

How much tension is there in the wire when the body is moving?

Answer: 1,8 N

Exercise 3.7 D

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

Determine the mass of the yellow metal weight.

Answer: 77 g

Exercise 3.7 E

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

What is the average force exerted to the puck by the stick?

Tip: The impulse caused by the force is equal to the change in impulse-momentum.
Answer: 160 N

Exercise 3.7 F

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

What is the average force exerted to the bandy ball by the stick?

Tip: The impulse caused by force is equal to the change in impulse-momentum.
Answer: 190 N

Exercise 3.7 G

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

What is the average force exerted to the tennis ball by the racket?

Tip: The impulse caused by force is equal to the change in impulse-momentum.
Answer: 440 N

Exercise 3.7 H

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

Define the average force on the ball during the acceleration. a) By means of the basic law mechanics: ∑ F̅ = ma̅. b) Through the power impulse: F∆t = m∆v

Answer: 0,08 N