ENGR10
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Introduction to Engineering /

Unit Conversions

Please use these unit-equivalence factors to complete the unit-conversion exercises below.

  • Please SHOW all WORK as NoWorkNoCredit

1 mile = 5280 feet / 1 Btu = 1054.4 Joule / 1 hour = 60 min
1 meter = 3.281 feet / 1 Watt = 1 Joule/sec / 1 min = 60 sec
1 foot = 12 inches / 1 HorsePower = 2545 Btu/hr / 1 gallon = 3.785 liters
1 yard = 3 feet / 1 km = 1000 meters / 1 ft3 = 7.4805 gallons
1 lb = 4.448 Newtons / 1 furlong = 220 yards / 1 Pascal = 1 Newton/m2
1 m2 = 1973.5 Circular inches / °F = 1.8x°C + 32 / 1 HorsePower = 550 ft-lb/s
1 cup = 48 TeaSpoon / 1 Acre = 43,560 ft2 / 1 lb = 16 ounces
$1 = 0.787€ / $1 = 16,030 Viet Nam Dong / $1 = 10.825 Mexican Pesos
  1. (4 Points) RACE CAR SPEED. In 1990 ArieLuyendyk, driving for Douglas Shierson Racing, won the Indianapolis 500 mile automobile race in a time of 2 hours, 41 minutes and 18.404 seconds (2h:41m:18.404s) What was Luyendyk’s average speed for the 1990 “Indy 500” in Miles per Hour?
  1. (3 Points) RACE CAR SPEED. With reference to problem-1, What was Luyendyk’s average speed for the 1990 “Indy 500” in Meters per Second?
  1. (4 Points) RACE CAR POWER. IndyCar Series engines are rev-limited to 10,300 rpm and produce approximately 650 HorsePower (650 hp). What is the IndyCar Power-Output in kiloWatts (kW)

  1. (4 Points) HAIR DRYER POWER. The Power Rating of personal Hair Dryer is 1875 Watts. What is the equivalent heating power in Btu/Hr?
  1. (3 Points) SOCCER FIELD AREA: By FIFA rules the Largest possible regulation soccer field measures 90 meters wide by 120 meters long. How many ACRES of Land are contained in this 90mX120m rectangle?
  1. (4 Points) MILK PRICE: In Mexico a liter of regular MILK costs about 11.70 Pesos. What is this cost when expressed in Dollars per Gallon ($/Gal)?
  1. (2 Points) MIDDLE EAST CLIMATE: The highest temperatures recorded[1] in the middle east range from the 110s to 120s, with Dhahran, Saudi Arabia, claiming an all time high of 124 °F. What is 124 °F when expressed in degrees Celcius (°C)?
  1. (5 Points) LIQUID MERCURY, Hg: The liquid metal mercury has a Specific Weight of 0.49 pounds per Cubic-Inch (lb/in3). ReState the Specific Weight of Hg in Newtons per Cubic-Meter
  1. (5 points) ROOM SIZE. In Japan, the size of rooms is measured in tatami mats (jo). One tatami mat is 1.8 m x 0.90 m; with 14-jo being a good-sized living/dining room. How large is this good-sized living room in square feet?
  1. (5 Points) WATER RESERVOIR STORAGE. The Water Storage Capacity of large reservoirs are measured in ACRE•FEET. An Acre•Foot of water is equivalent to an area of one Acre covered with water one foot deep. Lake Chabot has a storage capacity of about 504 Acre•Feet of water. Convert this storage capacity to Gallons.
  1. (2 Points) ANCHOR BOLTED-JOINT DESIGN. A Civil Engineering designs an earthquake retrofit system for a 4400 ft2 house. The engineer designs a foundation-stabilization structure that uses 5/16-18, stainless-steel concrete-anchor bolts. The anchor-bolt has PullOut rated Load of 7250 lbs. The building code calls for a minimum factor of safety of 1.4 which means that the Design Load can be NO MORE than 71.4% of the Rated Load. For these circumstance what is the rated load in lbs?
  1. (2 Points) ENGINE TORQUE Δ%. Jeep's overhead-cam sixcylinder, 230-cubic-inch gasoline engine, called the Tornado, was one of the first mass-produced overhead-cam engines built in the United States after World War II. In early 1960 Willys Motor engineer A.C. Sampietro started to design the new engine. By May 1961 Sampietro's engine had passed its 100-hour full-power certification tests producing the Torque/Power-Speed curve shown below. This engine has an usually “Flat” Torque-Speed curve[2]. What is the %-Change in Torque when the engine speed changes from 2200 rpm to 4000 rpm?

True/False

For the next Several Problems circle T or F

  1. (1 point) A Cubit is the first recorded unit of length. The Cubit was originally defined as the length of a Human FOREARM.

T / F
  1. (1 point) ) A Cubit is the first recorded unit of length. The Cubit was originally defined as the length of a Human THUMB.

T / F
  1. (1 point) The “STERADIAN” is a SI BASE Unit

T / F
  1. (1 point) The Engineering Unit “Watt” is the same thing as a “Joule per second”

T / F
  1. (1 point) The NONstandard SI-Unit PreFix “deci” (as in deciBel) means one tenth (1/10)

T / F
  1. (1 point) The NONstandard SI-Unit PreFix “centi” (as in centiLiter) means one hundred (100X or 100 times)

T / F
  1. The Force/Weight unit, the POUND (lb), is an SI Base-Unit

T / F
  1. (1 point) In past years Temperature was defined, at least in part, by the Freezing Point of the metal Platinum

T / F
  1. (1 point) The Degree Fahrenheit (°F) is a BASE Unit in The Système international d'unités (SI Unit System)

T / F
  1. (1 point) 100% and Number 1 are mathematically equivalent

T / F

Short Answer

  1. (2 Points) Name ALL the SI Base units Which are NOT defined in terms of Unchanging physical phenomena:
  1. (2 points) The SI unit “mole” contains about this many (a NUMBER) “entities”:
  1. (2 point) According to the Using Units Presentation the year in which The First “Atomic Clock”became operational was:
  1. (2 points) Name ALL of the SI Base Units:
  1. (2 points) Common measurements units can be “Derived” from the 7 basic SI units. Some of these derived units are given special names; e.g., the derived unit for electrical charge is called the “coulomb”. Other than the coulomb, list FOUR special-name units derived from the SI basis units.

Print Date/Time = 29-Oct-18/05:43

58 pts Total

©Bruce Mayer, PE • ChabotCollege •ENGR10_Using_Units_Conversion_HW_140207.docx • Page 1 of 8

[1]

[2] A flat Torque curve is usually very desirable