Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 0, Problem 26P
To determine
The number of heartbeats in an average life-time.
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A population of E. coli bacteria grows exponentially with time. You believe that the mean time between divisions is t, = 26 min, and that cell death occurs on average after tm = 200 hr. The
population starts with 1000 cells. Complete parts (a) through (c).
(a) Use the equation N(t) = N, e0-m)t to predict how many cells are present after 3 hours.
The number of cells present after 3 hours is.
(Do not round until the final answer. Then round to the nearest integer as needed.)
Estimate the number of times an average person's heart beats in a lifetime. Assume
the average heart rate is 69 beats/min and a life span of 75 yr.
a) 3 x 108 beats
O b) 3 × 1010 beats
c) 3 × 10° beats
d) 3 x 107 beats
A certain breed of mouse was introduced onto a small island with an initial population of 350 mice, and scientists estimate that the mouse population is doubling every year
(a) Find a function N that models the number of mice after t years
M) - 350(2)
(b) Estimate the mouse population after 9 years.
1X mice
Chapter 0 Solutions
Physics Fundamentals
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Estimate the mass of a virus.arrow_forwardRoughly how many times longer than the mean life of an extremely unstable atomic nucleus is the lifetime of a human?arrow_forwardAssuming one nerve impulse must end before another can begin, what is the maximum firing rate of a nerve in impulses pet second?arrow_forward
- (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?arrow_forward(a) Calculate the number of cells in a hummingbird assuming the mass of an average cell is ten times the mass of a bacterium. (b) Making the same assumption, how many cells are there in a human?arrow_forwardHow many heartbeats are there in a lifetime?arrow_forward
- (a) What is the order of magnitude of the number of micro organisms in the human intestinal tract? A typical bacterial length scale is 10-6 m. Estimate the intestinal volume and assume 1% of it is occupied by bacteria. (b) Does the number of bacteria suggest whether the bacteria are beneficial, dangerous, or neutral for the human body? What functions could they serve?arrow_forwardUse the approximate values from this table to solve the problem. How many heartbeats are there in a lifetime?arrow_forwardThey determined that they can use this exponential model to predict the number of trees in the forest that will be infected after y yearsarrow_forward
- The rate of change of atmospheric pressure P with respect to altitude h is proportional to P, provided that the temperature is constant. At a specific temperature the pressure is 102.3 kPa at sea level and 88 kPa at h = 1,000 m. (Round your answers to one decimal place.) (a) What is the pressure (in kPa) at an altitude of 3,500 m? kPa (b) What is the pressure (in kPa) at the top of a mountain that is 6,365 m high? kPaarrow_forwardFind the order of magnitude of the number of breaths a person takes during an average life span of 70years. Assume that a person take 15 breaths per minute.arrow_forwardIn 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 Itarrow_forward
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