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Units

Units are used to measure and describe quantitative data. A unit of measured is a definite magnitude of a physical quantity defined and adopted by convention or by law that is used as a standard for measurement of the same physical quantity. Any other value of that physical quantity can be expressed as a simple multiple of the unit of measurement.

Utilizing and converting units allows scientists and mathematicians to manipulate data by using ratios. There are two main systems of units. International System of Units, S.I units and Engineering Engineering Units, E.E. Units. S.I. units are the modern form of the metric system. It is comprised of seven bases units. This system is international accepted. Only Burma, Liberia and the United States have not adopted this system of units. E.E. units are another system of units used. This system has inconsistencies in converting and requires different conversion factors.

For example, length is a physical quantity. The metre is a unit of length that represents a definite predetermined length. When we say 10 metres, we actually mean 10 times the definite predetermined length called “metre”.

Dimension EE Units SI Units
Time Second (sec) Second (s)
Length Foot (Ft) Metre (m)
Mass Pound mass (Lbm) Kilogram (Kg)
Force Pound Force (Lbf) Newton (N)

 

Unit Conversions

1. Write the following quantities in standard units. (a) 0.66 Ms (b) 3.5 km (c) 27 mg (d) 125 cm 2. Compute, in centimeters and meters, the height of a basketball player 6 ft 4 in tall. 3. Is the following statement reasonable? It took 380 L of gasoline to fill up the car's tank. 4. A car trav

How to convert ...

How to convert 22000 in/s to m/min 0.0172Gm2to mm2 1900kl to ft3 0.0110dm2/min to mi2/yr

baseball hit by a bat

A 0.144 kg baseball is pitched horizontally at 32.0 m/s. After it is hit by the bat, it moves at the same speed, but in the opposite direction. (a) What was the change in momentum of the ball? -9.22 kg·m/s *correct (b) What was the impulse delivered by the bat? -9.22 N·s *correct (c) If the bat and ball were in

Permeability of Wood Species

I can see that a Darcy's law permeability equation exists and is as follows: k = (volume of liquid x length of specimen)/(time of flow x cross-sectional area of specimen x deltaP) In this equation, there are 2 parameters that I do not understand 1) When the equation refers to the "time of flow" (t) what is meant by that?

3 Lattice points: Largest area of the square.

A point (x,y) in the plane is called a lattice point if both x and y are integers. Find the side length of the largest square that contains exactly three lattice points in its interior. Your answer should be given in exact form, and completely justified.

Conversions

Please convert them (a) 456 cal to joules (b) 22.3 j to Calories (c) 234 kj to Calories (d) 12.4 Cal to joules -Calculate the amount of heat required to heat a 3.5-kg gold bar from 21 degrees celcius to 67 degrees celcius. -If 57 j of heat are added to an aluminum can with a mass of17.1 g, what is its tem

Conversion questions

1. Convert the following numbers to SI: a. 56.8 in = b. 1 year = c. 34.8 atm = d. 8.3 Btu/min = e. 38.96 ft/min f. 98.6 furlongs per fortnight g. 34.5 in pdl h. 15.8 gal/min 2. Perform the following conversions: a. 34.589 Pa to psia b. 34.6 m/s to mph c. 89.6 L to m3 d. 68.4 in3 to ft3 e. 964 slug to lbm f.

Tire Rotations and Frequency

If a bicycle tire is 66 cm in diameter. (a) At what frequency does the tire rotate when the bicycle is traveling at a speed of 30 km/h? (b) What is the angular frequency? Please show all work and formulas and the final answer. The final answer should be (a) 4.0Hz and (b) 25 rad/sec. I need to know exactly how to get those answer

Signal analysis

(See attached file for full problem description) --- Consider the set of all functions which can be constructed by linear summations of scaled and delayed versions of the three basis functions (top row). Any such function can be represented in the form f(t) = a x(t-τ1) + b y(t- τ2) + c z(t- τ3) + d, where a,b,

Why the Highest Piano Notes Have Short Strings

(See attached file for full problem description with proper symbols) --- Why the Highest Piano Notes Have Short Strings The steel used for piano wire has a breaking (tensile) strength of about and a density of . Part A What is the speed of a wave traveling down such a wire if the wire is stretched to its breaking p

Physical Units - What is Volts/Meter?

Please see the attached units question. I need to know this to be the result of one of my calculations correctly. Please choose any correct answers, if any, and then use dimensional analysis to show it equality to V/M. --- Are any of the following equivalent to Volts/Meter: ? C N N/C C/M^2 J V E J/m^3 N*M^2/C W

British thermal units

I AM HELPING MY 7TH GRADE DAUGHTER WITH A PAPER IN REGARDS TO BTU'S AND I DON'T REALLY COMPLETELY UNDERSTAND BTU'S ETC. THE PROJECT IS WHAT WOODS PUT OUT THE MOST BTU'S OAK OR PINE? WE BELIEVE OAK DUE TO THE DENSITY OF THE MATERIALS. CAN YOU PROVIDE ME WITH MORE INFORMATION IN REGARDS TO THIS?

Unit Conversions

Normally, women possess about 4.5 million red blood cells in each cubic millimeter of blood. If the blood flow through the heart is 250 milliliters per minute, how many red blood cells flow through a women's heart each second?

Wave patterns

You have an aluminum rod that has a F=400N with a Length of 2m. Aluminum's density (rho) is 2.71 x 10^3 kg/m. It has a diameter of 0.5 mm so use I2r. Find v, velocity.

Calculating mass and thickness

The average density of blood is 1.06 x 103 kg/ m3. If you donate a pint of blood to the Red Cross, what mass of blood have you donated, in grams? (1 pt = 1/2 L, 1 L = 1000 cm3) a. 530 g b. 0.530 g c. 5.30 x 103 g d. 5.30 x 105 g e. 5.30 g The l

Calculating Cost/Gallon

Question: If kerosene costs 130 passi per liter, and one dollar buys 227, what is its cost in dollars per gallon? [1.00 gallon = 3.79 liters] a. $2.17 per gallon b. $6.62 per gallon c. 15 cents per gallon d. 46 cents per gallon

Miles to Meters Conversion

Sixty miles/hour is about how many meters/second? a. 96 b. 112 c. 1.6 d. 27 e. 37 How many significant figures are in 0.0037010? I think their are seven significant figures is that correct?

Angstrom Unit

Given 1 angstrom unit = 10 ^-10 m and 1 fermi = 10 ^--15 m , what is the a. 1 angstrom = 10^5 fermi b. 1 angstrom = 10^-5 fermi c. 1 angstrom = 10^-25 fermi d. 1 angstrom = 10^25 fermi e. 1 angstrom = 10^-15 fermi

Metric Conversions : Speed and Kinetic Energy of the Eurasion Plate

The Eurasian plate, has a mass of 2.5*10^22kg and travels over the Earth's interior at 7 mm yr^-1. Express this speed in m s^-1(note there are 3.15*10^7 seconds in a year). Using the equation for kinetic energy Ek=1/2mv^2 (where m is mass and v is speed) calculate the kinetic energy of the Eurasian plate, give the final answer

SI units

In this equation h has the units J s, c has the units m s^-1, k has the units J K^-1 and T has the units K. Can you determine the units of a? a=hc/5kT

Force

Two snowcats tow a housing unit to a new location at McMurdo Base, Antarctica, as shown in Fig. 4-43. The sum of the forces FA and FB exerted on the unit by the horizontal cables is parallel to the line L, and FA = 4900 N....See Attached