(a) Suppose that a person has an average heart rate of 72.0 beats/min. How many beats does he or she have in 2.0 years? (b) In 2.00 years? (c) In 2.000 years?

The common Eastern mole, a mammal, typically has a mass of 75 g, which corresponds to about 7.5 moles of atoms. (A mole of atoms is 6.02 * 1023 atoms.) In atomic mass units (u), what is the average mass of the atoms in the common Eastern mole?

Fat cells in humans are composed almost entirely of pure triglycerides with an average density of about 900 kg/m3. If 20% of the mass of a 70 kg student’s body is fat (a typical value), what is the total volume of the fat in his body?

A spherical balloon is partially blown up and its surface area is measured. More air is then added, increasing the volume of the balloon. If the surface area of the balloon expands by a factor of 9.90 during this procedure, by what factor does the radius of the balloon increase?

(a) Calculate the approximate number of atoms in a single sheet of 0.01 lb paper. Note that a single carbon atom is about 2×10-26 kg in mass and 1 lb is approximately 4.448 N. (b) Estimate to order of magnitude the total mass of paper used by a typical class throughout a semester.

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

What is the ratio of the volume of 10 kg of gold to the volume of 10 kg of oak?

Calculate how many litters of gasoline are used in the USA in one day? Assume that there are two cars for every three people, and each car has driven an average of 12,000 mi per year and the average car gets 15 miles per gallon.

A pyramid has a square base of side x and height h. The volume V of the pyramid is given by the expression: V - x²h 3 If V is measured to 5% and h is measured to 3%, what is the percentage uncertainty of ? Remember to include the % symbol with your answer.