100 calories while walking a mile at a fairly brisk pace. How many miles per day would an average person have to walk in order to shed 2 pounds of body fat in 4 weeks?
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100 calories while walking a mile at a fairly brisk pace. How many miles per day would an average person have to walk in order to shed 2 pounds of body fat in 4 weeks?
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- How long does a 65 kg adult need to walk at a rate of 5 km/h in order to burn off all the energy in half slice of pizza. Each slice of pizza contains 1260 kJ of energy. The metabolic power for walking at 5 km/h is 380 W. O 27.6 min O 6.9 min O 55.3 min O 13.8 minCarrie is trying to figure out the number of calories in a cube of cheese. To do this, she pours 166.2 mL of water into an aluminum can suspended from a ring stand. She takes the temperature of the water, and finds it to be 19.1 degrees Celsius. Then, she places the 5.23 gram cube of cheese under the can and lights it on fire! While the cheese is burning and for a few minutes after it is done, Carrie records the temperature of the water, finding that it levels out at 45.4 degrees Celsius. How many calories of heat were gained by the water? Please answer to the nearest 0.1 calorie.Jessica is walking down the NYC while eating a hot dog. Her walking is making her lose calories. Her eating the hot dog is making her gain calories. The rate as which she is losing calories per minute is defined as f(t)=t^2+5. The rate at which she is gaining calories per minute is defined as g(t) =10t+50. Before her walk, she had already eaten an entire pretzel which contained 300 calories. a.) From the 0th minute to the 8th minute, approximate how many calories Jessiva has lost using LRS approximation of 4 subintervals. b.) What is the actual number of calories Jessica has lost on her 8 minute walk? c.) What is the exact number of calories Jessica has gained, eating her hotdog for 8 minutes? d.) What is the average rate of calorie loss during her walk? (Please use the average value formula) e.) At what time will Jessica have a net gain/loss of calories at 0? f.) After her 8 minute walk and taking into account the pretzel she had eaten prior, how many calories has Jessica…
- A 46-kg woman eats a 522 Calorie (522 kcal) jelly doughnut for breakfast. (a) How many joules of energy are the equivalent of one jelly doughnut? 2192.4 X Your response is off by a multiple of ten. J (b) How many steps must the woman climb on a very tall stairway to change the gravitational potential energy of the woman-Earth system by a value equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15 cm. 8.67 X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. stairs (c) If the human body is only 26% efficient in converting chemical potential energy to mechanical energy, how many steps must the woman climb to work off her breakfast? 9 X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. stairsAfter eating a 200 g pottle of yoghurt, a person decides to go for a run to burn off the extra energy. The yoghurt provides 5.4 MJ kg−1, and he is able to raise his metabolic rate to 220W while running. How long does he have to run?1 1 1 Name: 1 I 3. A. human heart consumes about 1 J per heartbeat. About how many joules of energy must food furnish to a person each day to supply this energy? For comparison purposes, one nutritionist's calorie of food energy is equivalent to 4184 J. 1 |
- A 62-kg woman eats a 620 Calorie (620 kcal) jelly doughnut for breakfast. (a) How many joules of energy are the equivalent of one jelly doughnut? 2594080 (b) How many steps must the woman climb on a very tall stairway to change the gravitational potential energy of the woman-Earth system by a value equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15 cm. 27893 stairs (c) If the human body is only 27% efficient in converting chemical potential energy to mechanical energy, how many steps must the woman climb to work off her breakfast? 75.2 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. stairs Need Help? Read ItA dietician develops a new diet, in which people drink copious amounts of ice water. The theory is that the body must raise the temperature from 0.0 deg C to body temperature (37.0 deg C), and will use energy (therefore burning fat) to achieve this. If it takes 3500 Cal (3500 kcal) of energy output to burn off 454 g (about 1 pound) of fat, how much ice water (in L) must be consumed to achieve this? (Useful information: 1 L = 1000 cm3; density of water = 1 g/cm3; specific heat of water = 1 cal/g deg C)A student is trying to find the energy it takes to melt an ice cube. They measure exactly 95.1 mL of water and pour it into a styrofoam cup. They use a thermometer to find the initial temperature is 23.8 °C, and then drop an ice cube in the water, covering it and stirring until it is completely melted. After it has melted, the water cools to a final temperature of 16.5 °C. How much energy (in calories) did it take to melt this ice cube? Note: The density of water is 1.0 g/mL and the specific heat of water is 1.0 cal/(g·°C)
- An average car consumes about 5 L of gasoline a day, and the capacity of the fuel tank of a car is about 50 L. Therefore, a car needs to be refueled once every 10 days. Also, the density of gasoline ranges from 0.68 to 0.78 kg/L, and its lower heating value is about 44,000 kJ/kg (i.e., 44,000 kJ of heat is released when 1 kg of gasoline is completely burned). Suppose all the problems associated with the radioactivity and waste disposal of nuclear fuels are resolved, and a car is to be powered by U-235. If a new car comes equipped with 0.1-kg of the nuclear fuel U-235, determine if this car will ever need refueling under average driving conditions3. After eating a 200 g pottle of yoghurt, a person decides to go for a run to burn off the extra energy. The yoghurt provides 5.4 MJ kg, and he is able to raise his metabolic rate to 220 W while running. How long does he have to run?Overall, 80% of the energy used by the body must be eliminated as excess thermal energy and needs to be dissipated. The mechanisms of elimination are radiation, evaporation of sweat (2,430 kJ/kg), evaporation from the lungs (38 kJ/h), conduction, and convection.A person working out in a gym has a metabolic rate of 2,500 kJ/h. His body temperature is 37°C, and the outside temperature 26°C. Assume the skin has an area of 2.0 m2 and emissivity of 0.97. (σ = 5.6696 10-8 W/m2 · K4) (a) At what rate is his excess thermal energy dissipated by radiation? (Enter your answer to at least one decimal place.) W(b) If he eliminates 0.44 kg of perspiration during that hour, at what rate is thermal energy dissipated by evaporation of sweat? (Enter your answer to at least one decimal place.) W(c) At what rate is energy eliminated by evaporation from the lungs? (Enter your answer to at least one decimal place.) W(d) At what rate must the remaining excess energy be eliminated through conduction and…