Dog years. Dog owners like to convert the age of a dog (dubbed dog years) to the usual meaning of years to account for the more rapid aging of dogs. One measure of the aging process in both dogs and humans is the rate at which the DNA changes in a process called methylation. Research on that process shows that after the first year, the equivalent age of a dog is given by
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FUNDAMENTALS OF PHYSICS - EXTENDED
- Bacteria and other prokaryotes are found deep underground, in water, and in the air. One micron (106 m) is a typical length scale associated with these microbes. (a) Estimate the total number of bacteria and other prokaryotes in the biosphere of the Earth. (b) Estimate the total mass of all such microbes. (c) Discuss the relative importance of humans and microbes to the ecology of planet Earth. Can Homo sapiens survive without them?arrow_forward(a) About how many microorganisms are found in the human intestinal tract? (A typical bacterial length scale is one micron = 106 m. Estimate the intestinal volume and assume bacteria occupy one hundredth of it.) (b) Discuss your answer to part (a). Are these bacteria beneficial, dangerous, or neutral? What functions could they serve?arrow_forwardPerform the following arithmetic operations, keeping the correct number of significant figures in your answer. a. The product 56.2 0.154 b. The sum 9.8 + 43.4 + 124 c. The quotient 81.340/arrow_forward
- A Campbell's tomato soup has a density of 1.05 g/cm³. How many grams of soup are in 5.00 × 10-2 m³ of soup? O 525 g 5, 250 g 52, 500 g 525, 000 garrow_forward1%A9 li. t LTET 4G+ Vol) O A X O U 9:-7 Second H.W.pdf 1. Draw and label the vector with these components. Then determine the magnitude and angle of the vector. a- Az = 3 ,A, = -2 b- B, = -2 ,B, = 2 2. What is the speed of horse in meter per second that runs a distance of 1.2 miles in 2.4 minutes? 3. A car moving along X- axis according on the function: X (t) = 2 t2 + 5t +7 on [1,2] Find: a- The average velocity. b- The acceleration at 3s. 4. Julie is walking around a track at a 2m/s for some exercise. She then decides to start jogging so she accelerates at a rate of 0.5m/s? for 3 seconds. How far did Julie travel from the time she started to accelerate to the end of the 3 seconds? 5. Ralph uses a 2000 to do this. force to push his car along a road for 1000 m. It takes him500 s a- Calculate the amount of work that Ralph did on the car. b- Calculate the amount of power that he generated. IIarrow_forwardA length of a rubber cord is L₁ meter when tension of 4 N is applied. The length become s L₂ meter when tension is 5 N. The length of the cord in meter, when tension is increased to 9 N is : 5 L₁ - 4 L₂ 5 L₂-4 L₁ (a) (c) (b) 4 L₁-5 L₂ (d) 4 L₂-5 L₁arrow_forward
- a) The instantaneous rate [kg/s] of producing a particular compound during a chemical reaction is updated every two seconds by a measurement device. The obtained measurements are listed in Table Q1.a. Estimate the mass of the compound after 12 seconds. Table Q1.a t [s] 0 2 4 6. 8 10 12 rate [kg/s] 0 0.145 0.354 0.61 0.95 1.23 1.66arrow_forwardThe initial mass of a certain species of fish is 2 million tons. The mass of fish, if left alone, would increase at a rate proportional to the mass, with a proportionality constant of 5/yr. However, commercial fishing removes fish mass at a constant rate of 12 million tons per year. When will all the fish be gone? If the fishing rate is changed so that the mass of fish remains constant, what should that rate be? When will all the fish be gone? Inco The fish will all be gone in years. (Round to three decimal places as needed.)arrow_forwardThe graph below shows the number of grams of a radioactive element t days after it was first discovered in a science lab. Estimate the instantaneous rate of change of the number of grams of this object at 5 days. +201 19 18 17 16 16 .. 14 19 12 # 10 。 s The numerical part of the instantaneous rate of change is with units For the units, enter full words. For example, if it was kph, you would say kilometers per hour. Or if it was you would say meters per seconds squared. m 2 8²arrow_forward
- A tourist purchases a car in England and ships it home to the United States.The car sticker advertised that the car’s fuel consumption was at the rate of 40 miles per gallon on the open road. The tourist does not realize that the U.K. gallon differs from the U.S. gallon: 1 U.K. gallon =4.546 090 0 liters 1 U.S. gallon = 3.785 411 8 liters. For a trip of 750 miles (in the United States), how many gallons of fuel does (a) the mistaken tourist believe she needs and (b) the car actually require?arrow_forwardThe average life expectancy in Japan is 81 years. What is this time in Si units?arrow_forwardThe doctor finally figures out wha is wrong with you and prescribes a medicine that will return you to full health. The order is for 25 mg of the medicine. The nurse walks in with a liquid and you ask to see the bottle. The bottle says 100 mg of medicine per 15 ml of liquid. How many millilitiers should she give you? Would she need to bring that to you in a dropper, a little cup, a glass or a large bottle?arrow_forward
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