A DVD has an effective inner radius of 2.3 cm and outer radius of 5.8 cm. The disk’s capacity is 4.7 gigabytes, where 1 byte= 8 bits. Find the number of bits stored per square meter, and compare with the density on a magnetic device, 1 x 1013 bits/m2.
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A DVD has an effective inner radius of 2.3 cm and outer radius of 5.8 cm. The disk’s capacity is 4.7 gigabytes, where 1 byte= 8 bits. Find the number of bits stored per square meter, and compare with the density on a magnetic device, 1 x 1013 bits/m2.
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- (a) What is the volume (in km3) of Avogadro’s number of sand grains if each grain is a cube and has sides that are 1.0 mm long? (b) How many kilometers of beaches in length would this cover if the beach averages 100 m in width and 10.0 m in depth? Neglect air spaces between grains.The rhinovirus, one cause of common cold and flu, has a diameter of 30 nm. How many of these particle could line up side by side on a line that is 1.0 inch long?A cell membrane is 4.81 nm thick. How thick is it in inches?
- Grains of fine California beach sand are approximately spheres with an average radius of 50 μm and are made of silicon dioxide, which has a density of 2.5 × 103 kg/m3. What mass of sand grains would have a total surface area (the total area of all the individual spheres) equal to the surface area of a cube 1.2 m on an edge?There is relatively little space between atoms in solids and liquids, so that the average density of an atom is about the same as matter on a macroscopic scale - approximately 10^3 kg/m^3. The nucleus of an atom has a radius of about 10^-5m of that of the entire atom, and conatins nearly all mass of the atom. a) What is the approximate density, in kilograms per cubic meter, of a nucleus. b) One possible remnant of a supernova, called a neutron star, can have the density of a nucleus, while being the size of a small city. What would be the raduis, in kilometers, of the neutron star with a mass 10 times that of the Sun? The radius of the Sun is 7*10^8 m and its mass is 1.99*10^30 kgProblem 2: The lawn outside your neighbor's house has an approximate area of 145 m2. Part (a) One night it snows so that the snow on the lawn has a uniform depth of 17.5 cm. What volume of snow is on the lawn, in cubic meters? Numeric : A numeric value is expected and not an expression. V = cubic centimeters? Part (b) What is the volume of this snow Numeric : A numeric value is expected and not an expression. V =
- g) 2.1*10^53 pg = ...? TgA scanning electron micrograph of xylem vessels in a corn root shows the vessels magnified by a factor of 608. In the micrograph the xylem vessel is 5.60 cm in diameter. What is the diameter of the vessel itself, answer in cm? and By what factor has the cross-sectional area of the vessel been increased in the micrograph?If you used only a keyboard to enter data, how many years would it take to fill up the hard drive in your computer that can store 95gigabytes95gigabytes (95×109bytes95×109bytes) of data? Assume "normal" eight-hour working days, and that one byte is required to store one keyboard character, and that you can type 180 characters per minute. Express your answer using two significant figures.
- - Your answer is partially correct. A partly-full paint can has 0.515 U.S. gallons of paint left in it. (a) What is the volume of the paint, in cubic meters? (b) If all the remaining paint is used to coat a wall evenly (wall area = 12.1 m²), how thick is the layer of wet paint? Give your answer in meters. (a) Number i 1.949 (b) Number i 312.1 Units Units m^3 m^2Paperweight I bought a pack of 100 rectangular index cards. Each card measured 15 by 10 cm. The pack said ：Paper Density = 200 GSM (grams per square meter). This means that a square meter of those cards weighs 200 g. A) All of the cards in the pack are place flat on a table without overlap. In square meters, what is the total area of the table covered by the cards? B) Each pack of cards is wrapped in a sheet of 50 GSM paper with an area of 800cm squared. I have a number of packs and wish to store them on a shelf that cannot hold more than 10 kg. What is the largest whole number of wrapped packs that can be stored? C) The total weight of 500 identical sheets of paper is 2.4kg. If each sheet measures 30cm by 20cm, what is its paper density in GSM? D) A business card measures 55mm by 90mm. Its paper density is 300 GSM. Fins its exact weight in grams.One mole of atoms consist of 6.02 × 10^23 individual atoms. If one mole of unicorn atoms were spread uniformly over the surface of a sphere the size of the Earth, approximately how many atoms would be found per square meter? The average radius of the Earth is 6.38 × 10^3 km.