- Estimate energy (in joule) of one human heartbeat.
-Estimate energy (in joule) of a hummingbird in flight.
-How many joule are in 1 kilowatt-hour?
-How many joule are in 1 Food Calorie?
Answer:
(a) Average power output of the human heart is 1.33 W. We can convert power into energy, watt (W) = joule/sec
Therefore, 1.33 W = 1.33 J/s.
Hence, a human heart consumes 1.33 J of energy per second and for one minute it consumes 60 x 1.33 J = 79.8 J.
Now, average heartbeat rate of a healthy human is 72 per minute. Then, the heart beats 72 times in a minute and consumes 79.8 J of energy. Therefore, 79.2 J/72 = 1.108 J energy per one heartbeat.
(b) Taking the average mass of a humming bird is m = 4 g or 0.004 kg and its speed is 22 m/s or 79 km/h.
Therefore, the kinetic energy of the humming bird in flight is k = 1/2 mv2 = 1/2 (0.004 kg) (22 m/s)2 = 0.968 J.
(c) 1 watt = 1 Joule/s so one kilo watt is equal to 1000 times of watt then 1kW = 1 kJ/s. Now,
1 kWh = (1kJ/s) h = (1 kJ/s) (3600 s) = 3600 kJ or 3600000 J or 3.6 x 106 J.
(d) One calorie of food has 4.184 J of energy
- Estimate energy (in joule) of one human heartbeat. -Estimate energy (in joule) of a hummingbird...
3) In this problem, you will use the relationship between the Joule (mechanical energy), the calorie (heat energy), and the Calorie (food energy). The relationship between the three is: 4,186 Joules = 1,000 heat calories = 1 food Calorie. 4,186] = 1,000 cal = 1 Cal. conversions, calculate how many times (and how many flights of steps) a 150 Ib person would have to climb the Sears Tower located in downtown Chicago if they ate a 500 Cal piece of...
9) In chis problem, you will use the relationship between the Joule (mechanical energy), the calorie (heat energy), and the Calorie (food energy). The relationship between the three is: 4,186 Joules 1,000 heat calories 1 food Calorie. 4,186]= 1,000 cal=1 Cal. Using the above conversions, calculate how many times (and how many flights of steps) a 150 Ib person would have to climb the Sears Tower located in downtown Chicago if they ate a 500 Cal piece of apple pie...
14. A hummingbird of mass 2.50 g consumes 65.0 ml of O, (at 27°C and 1 atm) per hour of flight. According to the unbalanced chemical equation: C6H12O6 (aq.) + O2(g) – CO2(g) + H2O(g) + AH a. How many mL of oxygen will the hummingbird need to gather to complete a five hour flight? Answer (enclose work) b. If glucose supplies all the needed energy, what is the minimum mass of glucose that the hummingbird must gather from plants...
Make an order of magnitude estimate of the energy (in joule) contained in a quart of soda.
The human body converts internal chemical energy into work and heat at rates of 60 to 125 W (called the basal metabolic rate). This energy comes from food and is usually measured in kilocalories [1 kcal = 4.186 kJ]. (Note that the nutritional `Calorie' listed on packaged food actually equals 1 kilocalorie). How many kilocalories of food energy does a person with a metoblic rate of 109.0 W require per day? (Assume 100 percent efficiency.)
Additional info: Meal = 1720 Kilocalories Mass of myself = 50 kg The Joule () is the SI unit of energy. (J = kg:m? S2 A calorie is another unit of energy. The definition of a calorie is the amount of heat (energy) necessary to raise the temperature of Ig of water by 1° Celsius. Ig of water occupies 1 milliliter (ml) = 1 cubic centimeter (cm) of volume. lkcal=4186J Energy comes in many forms and energy may be converted...
Please use dimensional analysis (factor label method) and show all steps Electricity in Chicago goes for about $0.06 per kilowatt hour. A kilowatt hour is just a unit of energy, like a Joule, since a Watt is a Joule per second, and a kilowatt hour is the number of Joules one would get from running 1000 Watts times one hour (3600 seconds). In the form of electricity, how much would a gigaJoule cost?
Expressing amounts of energy in different energy units is necessary to solve many chemistry problems. For practice, complete the following table. The Joule (J) is the SI unit of energy. 1 calorie (cal) = 4.184 J J cal kJ 567 151 0.651 Expressing amounts of energy in different energy units is necessary to solve many chemistry problems. For practice, complete the following table. The Joule (J) is the SI unit of energy. 1 calorie (cal) = 4.184 J; 1 kcal...
Estimate the pressure required to impart one joule of mechanical work in reversibly compressing one mole at room temperature for silver.
1) In a cycling road race consisting of a flat section and an uphill section, a particular cyclist pedals with an average power of 324 Watts for 5.50 hours on the flat section of the course, and an average power of 418 Watts for 30.0 minutes while climbing the uphill section, which has an average grade of 6%. Potentially useful information: Power = Energy/time; 1 Watt = 1 Joule/sec; 1 kcal = 4186 J (Note, 1 kcal = 1 food...