A hedgehog is foraging in Victoria Park. Its net gain rate ( γ ) is 55 KJ/hr and its energetic gain rate (b) is 80 KJ/hr. What is its energetic expenditure rate (e)? A. 25 KJ/hr B. 0.68 KJ/hr C. 1.45 KJ/hr D. 135 KJ/hr
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A hedgehog is foraging in Victoria Park. Its net gain rate ( γ ) is 55 KJ/hr and its energetic gain rate (b) is 80 KJ/hr. What is its energetic expenditure rate (e)?
| A. |
25 KJ/hr |
|
| B. |
0.68 KJ/hr |
|
| C. |
1.45 KJ/hr |
|
| D. |
135 KJ/hr |
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- It is not unusual for a 1000-kg car to get 30 mi/gal when traveling at 60 mi/h on a level road. A. If this car makes a 200-km trip, how many joules of energy does it consume?Note that 1.0 gal of gasoline yields 1.3 ×109 J (although this can vary)? B. What is the average rate of energy consumption during the trip?The specific energy and density of gasoline is -47.3 MJ/kg and 716 kg/m3, respectively. What is its energy density? A. -0.066 m3/MJ B. -0.066 MJ/m3 C. - 33. 867 MJ/m3 D. - 33, 867 m3/MJSuppose you require 2500 food Calories per day. a. What is your average power, in watts? b. How much energy, in joules, do you require from food in a year? Counting all forms of energy (such as gasoline, electricity, and energy for heating), the average person consumes about 350 billion joules of energy each year. Compare this value to the energy needed from food alone. a. What is your average power, in watts? Approximately 121 watts (Round to the nearest whole number as needed.) b. The energy required from food is approximately billion joules per year. (Round to the nearest tenth as needed.)
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