College Physics
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ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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A 50 kg log is floating above a waterfall at a rate of 10 ft/s. What will be the resulting
kinetic energy in kJ if the log falls down the waterfalls with a velocity of 30 ft/s?
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- An empty roller-coaster car weighs 400n. It does 80KJ of work against gravity in travelling to the top of the hill which makes up part of the track. Calculate the vertical distance through which it travels to get to the top of the hill.arrow_forwardThe 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_forwardA 71.4-kg boy is surfing and catches a wave which gives him an initial speed of 1.60 m/s. He then drops through a height of 1.61 m, and ends with a speed of 8.51 m/s. How much nonconservative work (in kJ) was done on the boy?arrow_forward
- For exercise, an athlete lifts a barbell that weighs 400 N from the ground to a height of 2.20 m at a constant speed in a time of 1.60 s. What is the metabolic energy, in kJ (kiloJoule)?arrow_forwardA pump is required to lift 800 kg of water per minute from a well 13.8 m deep and eject it with a speed of 17.9 m/s. How much work is done per minute in lifting the water? How much work is done in giving the water the kinetic energy it has when ejected?arrow_forward(a) What is the kinetic energy in joules of a 1150-kg automobile traveling at 79 km/h?=____ Joules(b) How much work would have to be done to bring a 1150-kg automobile traveling at 79 km/h to a stop?=______ Joulesarrow_forward
- Explorers in the jungle find an ancient monument in the shape of a large isosceles triangle as shown in the figure below. The monument is made from tens of thousands of small stone blocks of density 3 293 kg/m. The monument is 14.0 m high and 64.0 m wide at its base and is everywhere 2.50 m thick from front to back. Before the monument was built many years ago, all the stone blocks lay on the ground. How much work did laborers do on the blocks to put them in position while building the entire monument? Note: The gravitational potential energy of an object-Earth system is given by U, = Mgy CM, where M is the total mass of the object and yCM is the elevation of its center of mass above the chosen reference level.arrow_forwardWhat is the mass of the bullet?arrow_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_forward
- A 71.1-kg boy is surfing and catches a wave which gives him an initial speed of 1.60 m/s. He then drops through a height of 1.59 m, and ends with a speed of 8.51 m/s. How much nonconservative work (in kJ) was done on the boy?arrow_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_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_forward
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