Skip to main content
Ch 01: Units, Physical Quantities & Vectors
Young & Freedman Calc - University Physics 15th Edition
Young & Freedman Calc15th EditionUniversity PhysicsISBN: 9780135159552당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Young & Freedman Calc 15th EditionCh 01: Units, Physical Quantities & Vectors문제 8
1장, 문제 8

The RDA for the trace element selenium is 0.000070 g/day. Express this dose in mg/day.

검증된 단계별 안내
1
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: \( \text{milligrams/day} = 0.000070 \times 1000 \).

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
1m
도움이 되었나요?

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

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.
추천 영상:
가이드 코스
07:46
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.
추천 영상:
06:12
Ray Diagrams for Diverging Lenses

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.
추천 영상:
가이드 코스
08:25
Kinematics Equations
관련 실천
교과서 질문

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?

2184
views
교과서 질문

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).

2532
views
교과서 질문

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?

2167
views
1
rank
교과서 질문

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?

2538
views
교과서 질문

How many nanoseconds does it take light to travel 1.00 ft in vacuum? (This result is a useful quantity to remember.)

2343
views
교과서 질문

According to the label on a bottle of salad dressing, the volume of the contents is 0.473 liter (L). Using only the conversions 1 L = 1000 cm3 and 1 in. = 2.54 cm, express this volume in cubic inches.

2424
views