QUESTION 1 Period and frequency mean the same thing. True False 10 points QUESTI

Question

QUESTION 1

Period and frequency mean the same thing.

True

False

10 points   

QUESTION 2

A useful variable of traffic information is density how many cars occupy a stretch of a highway.

True

False

10 points   

QUESTION 3

"Time is a fundamental dimension and plays an important role in our daily life in describing events, processes, and many occurrences in our surroundings."

True

False

10 points   

QUESTION 4

A slightly eccentric engineering professor rides a motorcycle whose front wheel has a diameter of 60 cm. While riding the motorcycle she notices that the front wheel is rotating at 300 rpm. How fast is the motorcycle going?

51 mph

41 mph

31 mph

21 mph

10 points   

QUESTION 5

"It takes 10 seconds to fill a one-quart jar with water from your kitchen faucet. What is the flow rate, in gpm, from the faucet?"

1.5

4

10

40

10 points   

QUESTION 6

Which of the following is the British Gravitation unit for mass?

kilograms

pound mass

grams

slugs

10 points   

QUESTION 7

Density is a fundamental dimension.

True

False

10 points   

QUESTION 8

What happens to the mass of a marshmallow when squeeze it?

increases

decreases

remains the same

10 points   

QUESTION 9

Mass flow rate is a fundamental dimension.

True

False

10 points   

QUESTION 10

"Matter can exist in four states, depending on its own and the surrounding conditions: solid, liquid, gaseous, or plasma."

True

False

51 mph

41 mph

31 mph

21 mph

Explanation / Answer

1. False, because Period is 1 / frequency.

2. True, higher density implies more number of cars which will lead to slow traffic.

3. True, time, mass and length are fundamental dimensions.

4. Distance covered in one revolution= Perimeter of the wheel = 2*pi*(radius of wheel) = 2*3.14*30 = 188.4 cm = 1.884 m

Rotation speed is 300rpm which means 300 revolutions per minute which implies 300*60 revolutions per hour

Speed = Distance/Time = 1.884*300*60 = 33912 mph

There is some mistake in the options. The unit must be kmph and not mph, then only option number 3 will approximately be true.

5. Since we know how many gallons are coming out in 10 sec we can calculate how many gallons will come in 60 sec i.e., 1 min

Amount of water coming out in 1 min will be 0.25*6 = 1.5 gallon

Hence option 1, 1.5 gpm is correct.

6. Option 4 "slug” is the correct answer.

7. False. Density is derived from mass and length hence it is not a fundamental dimension.

8. "Remains the same". Only the volume is decreasing due to air pockets but the mass remains same.

9. False. Mass flow rate is derived from mass, length and time. Hence it is not a fundamental dimension.

10. True

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