Fall 18 University Physics 1

Zafir Baber

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homework 02 – ALMISHKHES, ABDULLAH – Due: Sep 7 2018, 10:00 pm (Central time) 1

Question 1, chap 102, sect 2.

part 1 of 1 10 points

The graph below shows the velocity v as a function of time t for an object moving in a straight line.

0 tQ tR tS tP Which of the following graphs shows the

corresponding displacement x as a function of time t for the same time interval?

1. t x

0 tQ tR tS tP

2. t x

0 tQ tR tS tP

4. None of these graphs are correct.

5. tx

0 tQ tR tS tP

7. t

0 tQ tR tS tP

9. t

0 tQ tR tS tP

Question 2, chap 102, sect 3.

part 1 of 2 10 points

A particle moves according to the equation x = (10 m/s2) t2 where x is in meters and t is in seconds. Find the average velocity for the time in-

terval from t1 = 2.18 s to t2 = 4.44 s. Answer in units of m/s.

Question 3, chap 102, sect 3.

part 2 of 2 10 points

Find the average velocity for the time in- terval from t1 = 2.18 s to t3 = 2.28 s. Answer in units of m/s.

Question 4, chap 102, sect 1.

part 1 of 2 10 points

A physics book is moved once around the perimeter of a table of dimensions 1 m by 3 m. If the book ends up at its initial position,

what is the magnitude of its displacement?

1. 1 m

2. 2 m

3. 7 m

4. None of these

5. 8 m

6. 3 m

7. 0 m

homework 02 – ALMISHKHES, ABDULLAH – Due: Sep 7 2018, 10:00 pm (Central time) 2

8. 4 m

9. 6 m

10. 5 m

Question 5, chap 102, sect 1.

part 2 of 2 10 points

What is the distance traveled?

1. 2 m

2. 7 m

3. 5 m

4. None of these

5. 1 m

6. 8 m

7. 6 m

8. 4 m

9. 3 m

10. 0 m

Question 6, chap 102, sect 5.

part 1 of 4 10 points

Consider a moving object whose po- sition x is plotted as a function of the time t on the following figure:

1I 2 3

tO II III

Clearly, the object moved in different ways during the time intervals denoted I, II and III on the figure.

During these three intervals, when was the object’s speed highest? Caution: Do not confuse the speed with the velocity.

1. During interval I.

2. During intervals II and III (same speed during those two intervals).

3. During interval III.

4. During interval II.

5. Same speed during each of the three in- tervals.

Question 7, chap 102, sect 5.

part 2 of 4 10 points

During which interval(s) did the object have no change in displacement?

1. During interval I only.

2. During intervals II and III.

3. During interval II only.

4. During each of the three intervals.

5. During none of the three intervals.

6. During interval III only.

Question 8, chap 102, sect 5.

part 3 of 4 10 points

During which interval(s) did the object’s velocity remain constant?

1. During none of the three intervals.

2. During each of the three intervals.

3. During interval II only.

4. During interval I only.

5. During interval III only.

homework 02 – ALMISHKHES, ABDULLAH – Due: Sep 7 2018, 10:00 pm (Central time) 3

Question 9, chap 102, sect 5.

part 4 of 4 10 points

During which interval(s) does the object have non-zero, positive acceleration?

1. During interval II only.

2. During each of the three intervals.

3. During interval III only.

4. During interval I only.

5. During none of the three intervals.

Question 10, chap 102, sect 5.

part 1 of 1 10 points

The acceleration of an object, starting from rest, is shown on the graph below.

0 1 2 3 4 5 −5

−4

−3

−2

−1

A cc el er a ti o n (m

/ s2 )

Time (s)

Acceleration vs Time

Other than at t = 0, when is the velocity of the object equal to zero?

1. At no other time on this graph.

2. During the interval from 1.0 s to 3.0 s.

3. 5.0 s

4. 3.5 s

5. 4.0 s

Question 11, chap 102, sect 6.

part 1 of 2 10 points

A speedboat increases in speed from 16.9 m/s to 30.7 m/s in a distance 170 m. Find the magnitude of its acceleration.

Answer in units of m/s2.

Question 12, chap 102, sect 6.

part 2 of 2 10 points

Find the time it takes the boat to travel this distance. Answer in units of s.

Question 13, chap 102, sect 7.

part 1 of 1 10 points

A ball thrown straight up at ground level passes a height of −0.6 m in 5.8 s. The acceleration of gravity is 9.8 m/s2 . What was its initial speed?

Answer in units of m/s.

Question 14, chap 102, sect 7.

part 1 of 2 10 points

A golf ball is released from rest from the top of a very tall building. Choose a coordinate system whose origin is at the starting point of the ball, and whose y axis points vertically upward. The acceleration of gravity is 9.8 m/s2 . Neglecting air resistance, calculate the ve-

locity of the ball after 3.24 s. Answer in units of m/s.

Question 15, chap 102, sect 7.

part 2 of 2 10 points

What is the position of the ball after 3.24 s? (Neglect air resistance.) Answer in units of m.

Question 16, chap 102, sect 7.

part 1 of 1 10 points

A student drops a rock from a bridge to the

homework 02 – ALMISHKHES, ABDULLAH – Due: Sep 7 2018, 10:00 pm (Central time) 4

water 13.1 m below. The acceleration of gravity is 9.8 m/s2 . With what speed does the rock strike the

water? Answer in units of m/s.