If the radius of a CD-ROM is 6 cm, what is the average area taken up by each bit if the total number of bits stored is 6 billion (6 x 109) bits?

How many years will it take to occupy the computer's hard drive that can store data of 82 gigabytes if you used the keyboard to input data? Assume "standard" 8-hour working days, and that one byte is needed to input one keyboard character, and that you are capable to type 180 characters per minute.

Estimate the number of molecules that make up Earth, assuming an average molecular mass of 30 g/mol. (Note there are on the order of 1024 objects per mole.)

Assuming the human body is made primarily of water, estimate the volume of a person.

Bacteria and other prokaryotes are found deep underground, in water, and in the air. One micron (10-6 m) is a typical length scale associated with these microbes. (a) Estimate the total number of bacteria and other prokaryotes onthe Earth. (b) Estimate the total mass of all such microbes.

[#142] How many cells are you? How many cells in a human? Assume that cells have a typical size of about 10 µm (1µm = 10-6 m) in all directions. And that we are the same density as water, and are made completely of cells (both exaggerations, of course, but fine for an order of magnitude estimate). Hints: What is the volume of a cell? What is the volume of a human? How can these quantities be related to give the number of cells in your body? The shape of the cell is not important in this rough estimate: for instance, the difference in volume fraction between say cubes and close packed spheres is only 26%. Format: When you enter your answer, enter it as a power of 10. For example: for 100000, enter "10^5". We'll use this notation later, too.

Greetings and thank you  15. (a) Suppose that a person has an average heart rate of72.0 beats/min. How many beats does he or she have in 2.0y? (b) In 2.00 y? (c) In 2.000 y?

(a) Calculate the number of cells in a hummingbird assuming the mass of an average cell is ten times the mass of a bacterium. The mass of a hummingbird is of the order of 10−2 kg and that of a bacterium is 10−15 kg. ? cells (b) Making the same assumption, how many cells are there in a human if his mass is of the order of 102 kg? ? cells

In a person infected with measles, the virus level N (measured in number of infected cells per ml of blood plasma) reaches a peak density at about t 12 days (when a rash appears) and then decreases fairly rapidly as a result of immune response. The area under the graph of N(t), the t-axis, and the lines t = 0 to t = 12, (as shown in the figure) is equal to the total amount of infection needed to develop symptoms (measured in density of infected cells x time). N= f) 1000- 12 21 The function has been modeled by the function (t) = -t(t - 21)(t + 1). Use this model with six subintervals and their midpoints to estimate the total amount of infection (in (infected cells/mL) - day) needed to develop symptoms of measles.t (infected cells/mL) day Need Help? Read It