102 Phys Quiz #1

1

Which of the following is NOT a derived unit?

a. m2

b. m

c. m3

d. m/s2

e. m/s

status: correct (1.0)

correct: b

your answer: b

feedback: Correct.

2

What happens to the period of a pendulum as its frequency is increased?

a. the period increases

b. more information is needed to determine the answer.

c. the period will increase or decrease, depending on the original value of the frequency.

d. the period remains constant

e. the period decreases

status: correct (1.0)

correct: e

your answer: e

feedback: Correct.

3

A child on a swing swings back and forth 25 times in 35 seconds. What is the frequency of the swing?

a. 0.71 Hz

b. 25 Hz

c. 35 Hz

d. 1.4 Hz

e. 0.029 Hz

status: correct (1.0)

correct: a

your answer: a

feedback: Correct.

4

A child on a swing swings back and forth 25 times in 35 seconds. What is the period of the swing?

a. 0.71 s

b. 1.4 s

c. 25 s

d. 35 s

e. 0.040 s

status: correct (1.0)

correct: b

your answer: b

feedback: Correct.

5

In which of the following cases will the average speed and average velocity have different values?

a. A car traveling at a speed of 25 m/s slows down to a stop in 10 s.

b. A car starts from rest and speeds up to a speed of 25 m/s, then travels at this speed for 1 hour.

c. A car traveling at a speed of 25 m/s slows down to 15 m/s, then speeds up again to a speed of 25 m/s.

d. A car starts from rest and speeds up to a speed of 25 m/s in 10 s.

e. A car travels to the east, then turns around and travels to the west.

status: incorrect (0.0)

correct: e

your answer: c

feedback: Incorrect. Since the direction of motion did not change, the average speed and average velocity will have the same values in this case. See page 22.

6

Which of the following is an example of a vector quantity?

a. 50 km/h

b. 50 m/s2

c. 50 km/h [North]

d. 50 m/s

e. 50 m

status: correct (1.0)

correct: c

your answer: c

feedback: Correct.

7

A car is...