Homework

Engineering 111 - Homework 12H

Instructions: Complete this form and click submit. The answers will be posted on the course home page after the due date and before the next exam. If you want to change any of your answers after you click submit, then go back and give your answers again and click submit.

Your Name: e.g. John Doe

Your Campus ID: e.g. 12345678

Your SFA Email Address: e.g. doejd@titan.sfasu.edu

Due Date

1. A young girl wishes to select one of the frictionless playground slides illustrated below to give her the greatest possible speed when she reaches the bottom of the slide.
Which of the slides illustrated in the diagram above should she choose?
(A) A
(B) B
(C) C
(D) D
(E) It doesn't matter; her speed would be the same for each.

Refer to the diagram below when answering the next two questions. Blocks I and II, each with a mass of 1.0 kg, are hung from the ceiling of an elevator by ropes 1 and 2.

2. What is the force exerted by rope 1 on block I when the elevator is traveling upward at a constant speed of 2.0 m/s?
(A) 2 N
(B) 10 N
(C) 12 N
(D) 20 N
(E) 22 N

3. What is the force exerted by rope 1 on block II when the elevator is stationary?
(A) 2 N
(B) 10 N
(C) 12 N
(D) 20 N
(E) 22 N

4. A car has a maximum acceleration of 3.0 m/s². What would its maximum acceleration be while towing a second car twice its mass?
(A) 2.5 m/s2
(B) 2.0 m/s2
(C) 1.5 m/s2
(D) 1.0 m/s2
(E) 0.5 m/s2

5. A woman weighing 6.0 x 10² N is riding an elevator from the 1st to the 6th floor. As the elevator approaches the 6th floor, it decreases its upward speed from 8.0 m/s to 2.0 m/s in 3.0 s. What is the average force exerted by the elevator floor on the woman during this 3.0 s interval?
(A) 120 N
(B) 480 N
(C) 600 N
(D) 720 N
(E) 1200 N

Refer to the following graph of velocity vs time when answering the next three questions.

The graph represents the motion of an object moving in one dimension.
6. What was the object's average acceleration between t = 0 s and t = 6.0 s?
(A) 3.0 m/s²
(B) 1.5 m/s²
(C) 0.83 m/s²
(D) 0.67 m/s²

7. How far did the object travel between t = 0 s and t = 6.0 s?
(A) 20. m
(B) 8.0 m
(C) 6.0 m
(D) 1.5 m

8. What was the average speed of the object for the first 6.0 s?
(A) 3.3 m/s
(B) 3.0 m/s
(C) 1.8 m/s
(D) 1.3 m/s

Your Name:	e.g. John Doe
Your Campus ID:	e.g. 12345678
Your SFA Email Address:	e.g. doejd@titan.sfasu.edu
Due Date

	1. A young girl wishes to select one of the frictionless playground slides illustrated below to give her the greatest possible speed when she reaches the bottom of the slide. Which of the slides illustrated in the diagram above should she choose? (A) A (B) B (C) C (D) D (E) It doesn't matter; her speed would be the same for each.
	Refer to the diagram below when answering the next two questions. Blocks I and II, each with a mass of 1.0 kg, are hung from the ceiling of an elevator by ropes 1 and 2. 2. What is the force exerted by rope 1 on block I when the elevator is traveling upward at a constant speed of 2.0 m/s? (A) 2 N (B) 10 N (C) 12 N (D) 20 N (E) 22 N
	3. What is the force exerted by rope 1 on block II when the elevator is stationary? (A) 2 N (B) 10 N (C) 12 N (D) 20 N (E) 22 N
	4. A car has a maximum acceleration of 3.0 m/s². What would its maximum acceleration be while towing a second car twice its mass? (A) 2.5 m/s2 (B) 2.0 m/s2 (C) 1.5 m/s2 (D) 1.0 m/s2 (E) 0.5 m/s2
	5. A woman weighing 6.0 x 10² N is riding an elevator from the 1st to the 6th floor. As the elevator approaches the 6th floor, it decreases its upward speed from 8.0 m/s to 2.0 m/s in 3.0 s. What is the average force exerted by the elevator floor on the woman during this 3.0 s interval? (A) 120 N (B) 480 N (C) 600 N (D) 720 N (E) 1200 N
	Refer to the following graph of velocity vs time when answering the next three questions. The graph represents the motion of an object moving in one dimension. 6. What was the object's average acceleration between t = 0 s and t = 6.0 s? (A) 3.0 m/s² (B) 1.5 m/s² (C) 0.83 m/s² (D) 0.67 m/s²
	7. How far did the object travel between t = 0 s and t = 6.0 s? (A) 20. m (B) 8.0 m (C) 6.0 m (D) 1.5 m
	8. What was the average speed of the object for the first 6.0 s? (A) 3.3 m/s (B) 3.0 m/s (C) 1.8 m/s (D) 1.3 m/s