Q&A Hero

Q: Momentum is a fundamental dimension. a. True b. False

Q: A measure of how hard it is to rotate something with respect to its center of rotation is called a. mass b. momentum c. torque d. mass moment of inertia

Q: Which of the following is the British Gravitation unit for mass? a. kilograms b. pound mass c. grams d. slugs

Q: Which of the following is the U.S. customary unit for mass? a. kilograms b. pound mass c. grams d. slugs

Q: Which of the following is the SI unit for mass? a. kilograms b. milligrams c. grams d. slugs

Q: The further away the mass is located from the center of rotation, the easier it will be to rotate the mass about that axis. a. True b. False

Q: Mass is a fundamental dimension. a. True b. False

Q: Matter can exist in four states, depending on its own and the surrounding conditions: solid, liquid, gaseous, or plasma. a. True b. False

Q: A car starting from rest has a constant acceleration of 4 m/s2. How fast will it be going in 5 seconds? a. b. c. d.

Q: A useful variable of traffic information is densityhow many cars occupy a stretch of a highway. a. True b. False

Q: A jiffy is the amount of time it takes light to travel one centimeter. If the speed of light is approximately , how many seconds are in a jiffy? a. b. c. d.

Q: If the pitcher's mound and home plate are apart, how much time (in seconds) does the batter have to react to a fastball? a. 0.45 seconds b. 1 second c. 1.5 seconds d. 2 seconds

Q: If you pull a pendulum back and let it go, the time required for it to return to approximately the same place from which it was released is called a. the period b. the frequency c. the natural frequency d. the amplitude

Q: Period and frequency mean the same thing. a. True b. False

Q: Because it takes the earth 24 hours to complete one revolution about its axis, every 15 degrees longitude corresponds to 1 hour. a. True b. False

Q: The problem is said to be steady when the value of a physical quantity under investigation changes over time. a. True b. False

Q: Most engineering problems may be divided into two broad areas: steady and unsteady. a. True b. False

Q: Time is a fundamental dimension and plays an important role in our daily life in describing events, processes, and many occurrences in our surroundings. a. True b. False

Q: The translational speed of a motorcycle is 20 mph. What is the rotational speed of the 24.4 in diameter front wheel? a. 250 rpm b. 275 rpm c. 300 rpm d. 325 rpm

Q: Volume flow rate measurements are necessary to determine the amount of water or natural gas being used by us in our homes during a specific period of time. a. True b. False

Q: 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? a. 1.5 b. 4 c. 10 d. 40

Q: While filling up your car with gasoline, you notice that it takes 3 minutes to dispense 55 liters of gasoline through the 2.5 cm diameter hose. What is the average speed, in m/s, of the gasoline inside the hose? a. 2.48 b. 0.62 c. 6.2 d. 0.248

Q: While filling up your car with gasoline, you notice that it takes 3 minutes to dispense 15 gallons of gasoline. What is the average flow rate in gpm? a. 3 b. 5 c. 10 d. 15

Q: A car traveling at constant speed as it rounds a curve is not accelerating. a. True b. False

Q: A person walks from home to a store with an average speed of 3 feet per second. When returning home from store, she jogs with an average speed of 6 feet per second, following her original path. What is the average speed for the round trip? a. 3 feet per second b. 4 feet per second c. 4.5 feet per second d. 6 feet per second

Q: If a wheel, turning at a constant angular speed, makes 5 complete revolutions every second, what is the angular speed, in revolutions per minute?

Q: If a wheel, turning at a constant angular speed, makes ten complete revolutions every second, what is the angular speed, in radians per second?

Q: When the "A" string of a properly tuned violin is plucked, it takes to return to it's starting position. What is the frequency of this oscillation?

Q: A certain medical imaging device commonly referred to as "ultrasound" creates sound by oscillating with a frequency of . What is the period of this oscillation?

Q: A certain medical imaging device commonly referred to as "ultrasound" creates sound by oscillating with a period of . What is the frequency of this oscillation?

Q: The speed of sound in air is approximately . The speed of light in air is approximately . If 10 seconds elapses between seeing a lightning strike and hearing the thunder, how far away was the lightning strike?

Q: The speed of sound in air is approximately . The speed of sound in steel is approximately . If your friend strikes one end of a steel pipe with a hammer while you listen at the other end, you will hear two distinct sounds: one traveling through the air and the other traveling through the steel pipe. If the pipe is 200 meters long, how much time elapses between the two sounds?

Q: The speed of sound in air is approximately . The speed of light in air is approximately . If a lightning strike occurs three kilometers away, how much time elapses before you hear the thunder?

Q: A unit of measure commonly used to quantify liquid flow is gpm. What does gpm stand for? a. Global Positioning Mechanism b. Gallons per Minute c. Greenhouse Pressure Measurement

Q: A unit of measure commonly used to quantify air flow is cfm. What does cfm stand for? a. Correct Fan Measurement b. Cubic Fan Measurement c. Cubic Feet per Minute

Q: When a solar flare occurs, how long does it take before a scientist sees it? (The Earth-Sun distance is and the speed of light is approximately . a. 8 microseconds b. 8 milliseconds c. 8 seconds d. 8 minutes

Q: A thunderstorm is brewing in the distance. Upon seeing a flash of lightning you begin counting the seconds until you hear the thunder and notice that it took 5 seconds for the sound of thunder to reach you. Assuming the speed of sound in air to be , estimate how far away was the lightning strike? a. 1 mile b. 2 miles c. 5 miles d. 10 miles

Q: A slightly eccentric engineering professor rides a motorcycle whose front wheel has a diameter of . While riding the motorcycle he notices that the front wheel is rotating at . How fast is the motorcycle going? a. 11 mph b. 21 mph c. 31 mph d. 41 mph

Q: A car travels along a certain road at an average speed of and returns along the same road at an average speed of. Calculate the average speed for the round trip. a. b. c. d. e.

Q: Comparing speed and velocity, a. speed is a vector quantity and therefore includes direction. b. velocity is a vector quantity and therefore includes direction. c. speed and velocity mean the same thing. d. none of the above apply.

Q: Ten seconds after starting from rest, a motorcycle is moving at 20 m/s. What is the motorcycle's acceleration in m/s2? Assume constant acceleration. a. b. c. d.

Q: A car traveling at constant speed as it rounds a curve is not experiencing angular acceleration. a. True b. False

Q: A car starting from rest has a constant acceleration of 5 m/s2. How long will it take to reach a speed of ? a. b. c. d.

Q: A car starts from rest and 5 seconds later it is going . What is the car's average acceleration? a. b. c. d.

Q: Your neighbor is digging a hole in his back yard for an in-ground swimming pool. The rectangular hole is 21 feet wide, 42 feet long and 6 feet deep. If a truck can haul 10 cubic yards, how many trips will it take to haul all of the dirt away? a. 10 b. 2 c. 7 d. 20

Q: A rubber ball has a diameter of three inches. What is its volume? a. 4.2 in3 b. 42 in3 c. 1.4 in3 d. 14 in3

Q: A rubber ball has a diameter of three inches. What is its surface area? a. 2.8 in2 b. 0.28 in2 c. 28 in2 d. 280 in2

Q: A certain unsharpened cylindrical pencil is inch in diameter and 10 inches long. What is the pencil's volume? a. 1 in3 b. 0.5 in3 c. 5 in3 d. 10 in3

Q: A certain unsharpened cylindrical pencil is inch in diameter and 10 inches long. What is the pencil's surface area? a. 2 in2 b. 4 in2 c. 6 in2 d. 8 in2

Q: Shown below are two beams both made from a standard 2 x 8. If each beam is supported at both ends, and if you were to stand in the middle of the beam, which beam would deflect more in the center? Why?a) b)

Q: The second moment of area provides information about an object's a. ability to resist bending b. ability to resist stretching c. ability to resist compression d. none of the above

Q: If an object is completely submerged in a fluid, its buoyant force is equal to a. the weight of the object b. the volume of the fluid displaced c. the weight of the fluid displaced d. the density of the fluid displaced

Q: There are 640 acres in a square mile. How many square miles are there in 80 acres? a. b. c. d.

Q: In the spring of 2010 an off-shore oil drilling rig exploded in the Gulf of Mexico. Not long after the explosion there was a 2 mm thick oil slick that was 5 miles long by 3 miles wide. How much oil was in the slick? Express your answer in gallons.

Q: A motorcycle has a magnet attached to the rim of its front wheel. The front tire has a diameter of 60 cm. A magnetic pickup is attached to the front forks and receives an electronic pulse each time the magnet passes by. How far has the motorcycle traveled when the pickup has received 10 pulses? a. 600 cm b. 60 cm c. 188.5 m d. 18.85 m

Q: An 8-foot tall vertical stack of firewood casts a 12-foot shadow on horizontal ground. What is the angle of the sun in the horizon? a. b. c. d.

Q: A certain sport utility vehicle is equipped with 17" rims (which correspond to a tire diameter of 25.7"). The vehicle is later upgraded to the 19" rims (which correspond to a tire diameter of 28.2"). If the onboard computer is not reset for the new tires, the odometer will not be accurate. When the odometer indicates that you have driven 1000 miles on the new tires, how many miles have you actually driven? (Round your answer to the nearest mile.)

Q: Explain why snowshoes allow a person to walk on top of the snow without sinking in.

Q: The strength of a tree branch is approximately proportional to its cross-sectional area while its weight is proportional to its volume. If you "scale up" a tree branch by a factor of two (double all of its linear dimensions) by what factor is its strength increased? By what factor is its weight increased?

Q: Describe why crushed ice cools your beverage faster than larger ice cubes.

Q: A car travels while consuming 60 liters of petrol (gasoline). What is the car's gas mileage in mpg?

Q: From your home, you walk east and then north. If you were to walk straight home, how far do you have to walk? a. b. c. d.

Q: From your home, you walked east and then north. What is your total distance traveled? a. b. c. d.

Q: While changing oil in your motorcycle you notice that you need 2 quarts and 6 ounces of oil, but you"re using a metric graduated cylinder to measure the oil. How many milliliters of oil do you need?

Q: Calculate the paint thickness if 2 gallons of paint covers a wall 10 feet high by 30 feet long. Use appropriate units.

Q: How many sheets of standard notebook paper (8.5 in x 11 in) would it take to cover a football field (50 yards x 120 yards)?

Q: How much would it cost to cover a football field (50 yard x 120 yard) with one-dollar bills (2 in x 6 in)?

Q: How many sugar cubes (1 cm x 1 cm x 1 cm) would fit in an empty class room with the dimensions of 10 m by 20 m by 4 m? a. 800 million b. 8 million c. 800,000 d. 80, 000

Q: How many nanometers are there in one meter? a. b. c. d.

Q: How many meters are there in one nanometer? a. b. c. d.

Q: How many millimeters are there in one meter? a. b. c. d.

Q: How many meters are there in one millimeter? a. b. c. d.

Q: How many centimeters are there in one meter? a. b. c. d.

Q: How many meters are there in one centimeter? a. b. c. d.

Q: How many cubic inches are there in a cubic foot? a. 1 b. 12 c. 144 d. 1728

Q: How many square inches are there in a square foot? a. 1 b. 12 c. 144 d. 1728

Q: Another name for rectangular coordinate system is a. polar coordinate system b. cylindrical coordinate system c. square coordinate system d. Cartesian coordinate system

Q: Which of the following coordinate systems is most common? a. rectangular b. cylindrical c. spherical d. polar

Q: Which is greater? a. 1 inch b. 1 centimeter

Q: Which is greater? a. 1 yard b. 1 meter