College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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On average, how much energy do humans
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- The Joule (J) and calorie (cal) are both units of energy. In the U.S., the energy provided by food is given on product labels in nutritional calories (NC). 1 NC is the same as 1 kilocalorie (kcal). In England, the energy provided by food is given in kilojoules (kJ). A can of soup in england has the following nutritional information on the label: 385 kJ of energy per 275.0 mL of soup. In the U.S., the same nutritional information would be given in NC per cup of soup. How many NC per cup does the soup provide?arrow_forwardSamantha wishes to maintain her weight and goes to the gym to work off the calories she consumed at breakfast that morning. She lifts a 23.0-kg barbell from shoulder level to above her head, through a vertical height of 0.550 m. How many times must she lift the barbell to make up for the 3.15 102 Calories of energy she consumed at breakfast? Note that Calories refers to food calories. (Include lowering the barbell as well.)arrow_forwardIn the figure, a 3.2 g ice flake is released from the edge of a hemispherical bowl whose radius ris 19 cm. The flake-bowl contact is frictionless. (a) What is the speed of the flake when it reaches the bottom of the bowl? (b) If we substituted a second flake with 5 times the mass, what would its speed be? (c) If, instead, we gave the flake an initial downward speed 0.51 m/s along the bowl, what would the answer be? Ice flake-arrow_forward
- A weightlifter curls a 26 kg bar, raising it each time a distance of 0.65 m . How many times must he repeat this exercise to burn off the energy in one slice of pizza? Assume 25% efficiency. Energy content of one slice of pizza is 1260 kJarrow_forwardSuppose that in one year a country produces 2.77 × 10'' kilowatt-hours (kWh) of electrical energy from 4148 hydroelectric plants (1.00 kWh = 3.60 × 10° J). On average, each plant is 90.0% efficient at converting mechanical energy to electrical energy, and the average dam height is 50.0 m. At 2.77 x 10!1 kWh of electrical energy produced in one year, what is the average power output Payg per Pavg W %3D hydroelectric plant? What total mass of water m flowed over the dams during that year? m = kg What was the average mass of water mavg per dam that provided the mechanical energy to generate the electricity? mavg kg What was the average volume of water Vavg per dam that provided the mechanical energy to generate the electricity? (The density of water is 1000 kg/m³.) Vavg m %3D A gallon of gasoline contains 4.50 × 10' J of energy. How many gallons n of gasoline did the 4148 dams save? n = gal MacRook Proarrow_forwardUnder normal conditions the human heart converts about 12.7 J of chemical energy per second into 1.27 W of mechanical power as it pumps blood throughout the body HINT (a) Determine the number of Calories required to power the heart for one day, given that 1 Calorie equals 4186 J. Cal (b) Metabolizing 1 kg of fat can release about 9000 Calories of energy. What mass of metabolized fat (in kg) would power the heart for one day? kg Need Help? Watch it Read Itarrow_forward
- A student evaluates a weight loss program by calculating the number of times she would need to climb a 10.0 m high flight of steps in order to lose one pound (0.45 kg) of fat. Metabolizing 1.00 kg of fat can release 3.77 x 10'J of chemical energy and the body can convert about 21.2% of this into mechanical energy (the rest goes into internal energy.) HINT (a) How much mechanical energy (in J) can the body produce from 0.450 kg of fat? (b) How many trips up the flight of steps are required for the 52.0 kg student to lose 0.450 kg of fat? Ignore the relatively small amount of energy required to return down the stairs. trips Need Help? Read It Watch Itarrow_forwardMeteor Crater. About 50,000 years ago, a meteor crashed into the earth near present-day Flagstaff, Arizona. Measurements from 2005 estimate that this meteor had a mass of about kg (around 150,000 tons) and hit the ground at a speed of (a) How much kinetic energy did this meteor deliver to the ground? (b) How does this energy compare to the energy released by a 1.0-megaton nuclear bomb? (A megaton bomb releases the same amount of energy as a million tons of TNT, and 1.0 ton of TNT releases J of energy.arrow_forwardRub your hands together vigorously. What happens? Discuss the energy transfers and transformations that take place.arrow_forward
- Similar to the previous problem, we heat about a cup (230 g) of milk (we'll treat it like water, with a specific heat of 4186 J/kg °C) from refrigerator temperature (5.2 °C) to a comfortable drinking temperature (52.5 °C) in order to make a cup of hot chocolate. First, find the energy required to heat this milk. Next, imagine giving a 1,600 kg truck this same amount of kinetic energy. What speed (in m/s) will the truck be travelling?arrow_forwardSamantha wishes to maintain her weight and goes to the gym to work off the calories she consumed at breakfast that morning. She lifts a 28.0-kg barbell from shoulder level to above her head, through a vertical height of 0.550 m. How many times must she lift the barbell to make up for the 3.25 102 Calories of energy she consumed at breakfast? Note that Calories refers to food calories. (Include lowering the barbell as well.) The answer is NOT 9arrow_forwardThe metabolic power for typing is 150 W for Lili, not a lot as you know probably. How long does it take to burn off the energy in a slice of apple pie, which energy content is 1680 kJ (400 food calorie), in minutes? (Try to stay active, working/studying in front of a computer is not the best exercise you can do for your body.) Your answer needs to have 3 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.arrow_forward
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