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**Solutions as numbers (EduCue)**

Classroom Response System “Clicker” Questions for Physics for Scientists and Engineers by Randall D. Knight Solutions as numbers (EduCue) PowerPoints prepared by Benjamin Grinstein, University of California San Diego

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Chapter 1

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**Which car is going faster, 1 or 2**

Which car is going faster, 1 or 2? Assume there are equal intervals of time between the frames of both movies. Car Car 2 STT1.1

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**Which car is going faster, 1 or 2**

Which car is going faster, 1 or 2? Assume there are equal intervals of time between the frames of both movies. Car Car 2 2 is going faster STT1.1

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**2. (a) is ball, (b) is dust, (c) is rocket **

Three motion diagrams are shown. Which is a dust particle settling to the floor at constant speed, which is a ball dropped from the roof of a building, and which is a descending rocket slowing to make a soft landing on Mars? 1. (a) is dust, (b) is ball, (c) is rocket 2. (a) is ball, (b) is dust, (c) is rocket 3. (a) is rocket, (b) is dust, (c) is ball 4. (a) is rocket, (b) is ball, (c) is dust 5. (a) is ball, (b) is rocket, (c) is dust STT1.2

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**2. (a) is ball, (b) is dust, (c) is rocket **

Three motion diagrams are shown. Which is a dust particle settling to the floor at constant speed, which is a ball dropped from the roof of a building, and which is a descending rocket slowing to make a soft landing on Mars? 1. (a) is dust, (b) is ball, (c) is rocket 2. (a) is ball, (b) is dust, (c) is rocket 3. (a) is rocket, (b) is dust, (c) is ball 4. (a) is rocket, (b) is ball, (c) is dust 5. (a) is ball, (b) is rocket, (c) is dust STT1.2

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**A particle moves from position 1 to position 2 during the interval ∆t**

A particle moves from position 1 to position 2 during the interval ∆t. Which vector shows the particle’s average velocity? STT1.3 (1) (2) (3) (4) (5)

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**A particle moves from position 1 to position 2 during the interval ∆t**

A particle moves from position 1 to position 2 during the interval ∆t. Which vector shows the particle’s average velocity? STT1.3 (1) (2) (3) (4) (5)

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**A particle undergoes acceleration while moving from point 1 to point 2**

A particle undergoes acceleration while moving from point 1 to point 2. Which of the choices shows the velocity vector as the object moves away from point 2? (1) (2) (3) (4) STT1.4

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**A particle undergoes acceleration while moving from point 1 to point 2**

A particle undergoes acceleration while moving from point 1 to point 2. Which of the choices shows the velocity vector as the object moves away from point 2? (1) (2) (3) (4) STT1.4

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Rank in order, from the most to the least, the number of significant figures in the following numbers. For example, if b has more than c, c has the same number as a, and a has more than d, you could give your answer as b > c = a > d. a b c d 1. d > c > b = a 2. a = b = d > c 3. b = d > c > a 4. d > c > a > b 5. b > a = c = d STT1.5

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Rank in order, from the most to the least, the number of significant figures in the following numbers. For example, if b has more than c, c has the same number as a, and a has more than d, you could give your answer as b > c = a > d. a b c d 1. d > c > b = a 2. a = b = d > c 3. b = d > c > a 4. d > c > a > b 5. b > a = c = d STT1.5

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Chapter 1 Reading Quiz

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**4. An object that can be represented as a single point in time **

What is a “particle”? 1. Any part of an atom 2. An object that can be represented as a mass at a single point in space 3. A part of a whole 4. An object that can be represented as a single point in time 5. An object that has no top or bottom, no front or back IG1.1

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**4. An object that can be represented as a single point in time **

What is a “particle”? 1. Any part of an atom 2. An object that can be represented as a mass at a single point in space 3. A part of a whole 4. An object that can be represented as a single point in time 5. An object that has no top or bottom, no front or back IG1.1

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**What quantities are shown on a complete motion diagram?**

1. The position of the object in each frame of the film, shown as a dot 2. The average velocity vectors (found by connecting each dot in the motion diagram to the next with a vector arrow) 3. The average acceleration vectors (there is one acceleration vector linking each two velocity vectors) 4. All of the above IG1.2

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**What quantities are shown on a complete motion diagram?**

1. The position of the object in each frame of the film, shown as a dot 2. The average velocity vectors (found by connecting each dot in the motion diagram to the next with a vector arrow) 3. The average acceleration vectors (there is one acceleration vector linking each two velocity vectors) 4. All of the above IG1.2

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**An acceleration vector**

1. tells you how fast an object is going. 2. is constructed from two velocity vectors. 3. is the second derivative of the position. 4. is parallel or opposite to the direction of motion. 5. Acceleration vectors weren’t discussed in this chapter. IG1.3

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**An acceleration vector**

1. tells you how fast an object is going. 2. is constructed from two velocity vectors. 3. is the second derivative of the position. 4. is parallel or opposite to the direction of motion. 5. Acceleration vectors weren’t discussed in this chapter. IG1.3

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**The pictorial representation of a physics problem consists of**

1. a sketch. 2. a coordinate system. 3. symbols. 4. a table of values. 5. all of the above. IG1.4

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**The pictorial representation of a physics problem consists of**

1. a sketch. 2. a coordinate system. 3. symbols. 4. a table of values. 5. all of the above. IG1.4

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