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Bacteria vary in size, but a diameter of 2.0 μm is not unusual. What are the volume (in cubic centimeters) and surface area (in square millimeters) of a spherical bacterium of that size?
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Ch 01: Units, Physical Quantities & Vectors
Young & Freedman Calc15th EditionUniversity PhysicsISBN: 9780135159552
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TOC.tableOfContents
- Ch 01: Units, Physical Quantities & Vectors37
- Ch 02: Motion Along a Straight Line57
- Ch 03: Motion in Two or Three Dimensions45
- Ch 04: Newton's Laws of Motion23
- Ch 05: Applying Newton's Laws54
- Ch 06: Work & Kinetic Energy11
- Ch 07: Potential Energy & Conservation6
- Ch 08: Momentum, Impulse, and Collisions15
- Ch 09: Rotation of Rigid Bodies37
- Ch 10: Dynamics of Rotational Motion44
- Ch 11: Equilibrium & Elasticity27
- Ch 12: Fluid Mechanics27
- Ch 13: Gravitation34
- Ch 14: Periodic Motion26
- Ch 15: Mechanical Waves22
- Ch 16: Sound & Hearing28
- Ch 17: Temperature and Heat28
- Ch 18: Thermal Properties of Matter35
- Ch 19: The First Law of Thermodynamics29
- Ch 20: The Second Law of Thermodynamics18
- Ch 21: Electric Charge and Electric Field28
- Ch 22: Gauss' Law21
- Ch 23: Electric Potential31
- Ch 24: Capacitance and Dielectrics18
- Ch 25: Current, Resistance, and EMF24
- Ch 26: Direct-Current Circuits29
- Ch 27: Magnetic Field and Magnetic Forces16
- Ch 28: Sources of Magnetic Field10
- Ch 29: Electromagnetic Induction22
- Ch 30: Inductance14
- Ch 31: Alternating Current20
- Ch 33: The Nature and Propagation of Light17
- Ch 34: Geometric Optics29
- Ch 35: Interference13
- Ch 36: Diffraction19
- Ch 37: Special Relativity19
- Ch 38: Photons: Light Waves Behaving as Particles12
- Ch 39: Particles Behaving as Waves25
- Ch 40: Quantum Mechanics I: Wave Functions20
- Ch 41: Quantum Mechanics II: Atomic Structure21
- Ch 42: Molecules and Condensed Matter17
- Ch 43: Nuclear Physics13
- Ch 44: Particle Physics and Cosmology17
Young & Freedman Calc15th EditionUniversity PhysicsISBN: 9780135159552Non è quello che usi tu?Cambia libro di testo
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Young & Freedman Calc 15th EditionCh 01: Units, Physical Quantities & VectorsProblema 8
Young & Freedman Calc 15th EditionCh 01: Units, Physical Quantities & VectorsProblema 8Capitolo 1, Problema 8
The RDA for the trace element selenium is 0.000070 g/day. Express this dose in mg/day.
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Understand the relationship between grams and milligrams. There are 1000 milligrams in 1 gram.
Identify the given value in grams, which is 0.000070 g/day.
To convert grams to milligrams, multiply the given value by 1000. This is because 1 gram is equal to 1000 milligrams.
Set up the conversion equation: \( \text{milligrams/day} = \text{grams/day} \times 1000 \).
Substitute the given value into the equation: \( \text{milligrams/day} = 0.000070 \times 1000 \).
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Unit Conversion
Unit conversion is the process of converting a quantity expressed in one unit to another unit. In this case, converting grams to milligrams involves multiplying the given value by 1,000, since 1 gram equals 1,000 milligrams. This is essential for expressing the recommended daily allowance (RDA) of selenium in the desired unit.
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Unit Conversions
Trace Elements
Trace elements are minerals required by the body in very small amounts for various physiological functions. Selenium is one such trace element, important for antioxidant protection and thyroid function. Understanding the significance of trace elements helps in appreciating why precise dosages, like the RDA, are crucial for health.
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Recommended Dietary Allowance (RDA)
The Recommended Dietary Allowance (RDA) is the average daily intake level of a nutrient considered sufficient to meet the requirements of most healthy individuals. It is a guideline used to ensure adequate nutrition and prevent deficiencies. Knowing the RDA helps in understanding the importance of the specified dose of selenium for maintaining health.
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A certain fuel-efficient hybrid car gets gasoline mileage of 55.0 mpg (miles per gallon). If you are driving this car in Europe and want to compare its mileage with that of other European cars, express this mileage in km/L (L = liter).
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With a wooden ruler, you measure the length of a rectangular piece of sheet metal to be 12 mm. With micrometer calipers, you measure the width of the rectangle to be 5.98 mm. Use the correct number of significant figures: What is the area of the rectangle?
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In the fall of 2002, scientists at Los Alamos National Laboratory determined that the critical mass of neptunium-237 is about 60 kg. The critical mass of a fissionable material is the minimum amount that must be brought together to start a nuclear chain reaction. Neptunium-237 has a density of 19.5 g/cm3. What would be the radius of a sphere of this material that has a critical mass?
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