ENGR.MECH.:STAT.+DYNAMICS
15th Edition
ISBN: 9780134780955
Author: HIBBELER
Publisher: RENT PEARS
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The specific weight (wt./vol.) of brass is 85 kN/m^3. Determine its density (mass/vol.) in SI units. Use an appropriate prefix.
1. What is the weight in pounds-force of an object with a mass of 19 lbm on a planet where g = 12 ft/s2?
2. If a gas has γ = 14 N/m3, what is its density? State your answers in SI units.
In medical work, pressures are often measured in units of mm of H2O because body fluids, including the cerebrospinal fluid, typically have nearly the same density as water. The pressure of the cerebrospinal fluid can be measured by means of a spinal tap. A hollow tube is inserted into the spinal column, and the height to which the fluid rises is observed. If the fluid rises to a height of 160 mm, we write its gauge pressure as 160 mm H2O.
(a) Express this pressure in pascals, in atmospheres, and in millimeters of mercury.
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- In medical work, pressures are often measured in units of mm of H2O because body fluids, including the cerebrospinal fluid, typically have nearly the same density as water. The pressure of the cerebrospinal fluid can be measured by means of a spinal tap. A hollow tube is inserted into the spinal column, and the height to which the fluid rises is observed. If the fluid rises to a height of 160 mm, we write its gauge pressure as 160 mm H2O. a) Sometimes it is necessary to determine whether an accident victim has suffered a crushed vertebra that is blocking the flow of cerebrospinal fluid in the spinal column. In other cases, a physician may suspect that a tumor or other growth is locking the spinal column and inhibiting the flow of cerebrospinal fluid. Such conditions can be investigated by means of the Queckensted test. In this procedure the veins in the patient’s neck are compressed, to make the blood pressure rise in the brain. The increase in pressure in the blood vessels is…arrow_forwardExpress the quantity 254,998 m in each unit: ___ km, ____ mm, ____ cm.arrow_forwardQ 1: Convert the quantities 300 lb • s and 52 slug/ft3 to appropriate SI units.arrow_forward
- Carbon-tetra chloride has a mass density of 1200 kg/m3 Calculate its mass density specific weight and specific volume in the metric, and the English gravitational systems of units Also calculate its specific gravity.arrow_forwardIf under standard conditions a certain gas weighs 0.14 lb/ft3, then its corresponding specific volume, expressed in terms of cubic feet per slug (ft3 /slug), must bearrow_forwardExpress a speed of 20 nm/h (1 nautical mile = 6076 ft)in units of kilometers per minute.arrow_forward
- The air pressure in an automobile tire is 35 psi. Express the pressure in appropriate SI units (kPa).arrow_forwardFor each of the following items, state which U.S. customary units and which metric units in common use would be most appropriate for describing the size of the item. In each case, Say briefly why you chose the units. a. The volume of water in a full bathtub b. The length of a swimming pool. c. The weight of a slice of bread. d. The volume of a slice of bread. e. The weight of a ship. f. The length of an ant.arrow_forwardstate the following pressures as absolute pressure in pascals relative to 1 standard atmosphere 1. -1.0132kPa 2. 760 mmHg 3. 29.92 in Hg absolute 4. 5 lb/in^2arrow_forward
- A volume of 400 cc of air is measured at a pressure of 740 mm Hg absolute and a temperature of 18 ˚C. What will be the volume (in cc) at 760 mm Hg and 0 ˚C?arrow_forwardRepresent the following combinations of units in the correct SI form:mN/kg.usarrow_forwardRepresent the following combinations of units in the correct SI form using an appropriate prefix: MN/kg.msarrow_forward
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