Suppose a car travels 108 km at a speed of 30.0 m/s, and uses 2.0 gal of gasoline. Only 30% of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (See Table for the energy content of gasoline.) (a) What is the magnitude of the force exerted to keep the car moving at constant speed? (b) If the required force is directly proportional to speed, how many gallons will be used to drive 108 km at a speed of 28.0 m/s? Table 7.1 Energy of Various Objects and PhenomenaObject/phenomenonEnergy in joulesBig Bang1068Energy released in a supernova1044Fusion of all the hydrogen in Earth's oceans1034Annual world energy use4x1020Large fusion bomb (9 megaton)3.8×10161 kg hydrogen (fusion to helium)6.4x10141 kg uranium (nuclear fission)8.0×1013Hiroshima-size fission bomb (10 kiloton)| 4.2x101390,000-ton aircraft carrier at 30 knots1.1x10101 barrel crude oil5.9x10° 1 ton TNT4.2x10°1 gallon of gasoline1.2x108Daily home electricity use (developed countries) 7x107Daily adult food intake (recommended)1.2x107|1000-kg car at 90 km/h3.1x1051 g fat (9.3 kcal)3.9×104ATP hydrolysis reaction3.2x1041 g carbohydrate (4.1 kcal)1.7x1041 g protein (4.1 kcal)1.7×104Tennis ball at 100 km/h22Mosquito (10- g at 0.5 m/s)1.3x10-6Single electron in a TV tube beam4.0x10¬15Energy to break one DNA strand10-19

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Description: Suppose a car travels 108 km at a speed of 30.0 m/s, and uses 2.0 gal of gasoline. Only 30% of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (See Table for the energy content of gasoline

Answered: Table 7.1 Energy of Various Objects and…

College Physics

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ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Suppose a car travels 108 km at a speed of 30.0 m/s, and uses 2.0 gal of gasoline. Only 30% of the gasoline goes into useful work by the force that keeps the car moving at constant speed despite friction. (See Table for the energy content of gasoline.) (a) What is the magnitude of the force exerted to keep the car moving at constant speed? (b) If the required force is directly proportional to speed, how many gallons will be used to drive 108 km at a speed of 28.0 m/s?

Table 7.1 Energy of Various Objects and Phenomena
Object/phenomenon
Energy in joules
Big Bang
1068
Energy released in a supernova
1044
Fusion of all the hydrogen in Earth's oceans
1034
Annual world energy use
4x1020
Large fusion bomb (9 megaton)
3.8×1016
1 kg hydrogen (fusion to helium)
6.4x1014
1 kg uranium (nuclear fission)
8.0×1013
Hiroshima-size fission bomb (10 kiloton)
| 4.2x1013
90,000-ton aircraft carrier at 30 knots
1.1x1010
1 barrel crude oil
5.9x10°

1 ton TNT
4.2x10°
1 gallon of gasoline
1.2x108
Daily home electricity use (developed countries) 7x107
Daily adult food intake (recommended)
1.2x107
|1000-kg car at 90 km/h
3.1x105
1 g fat (9.3 kcal)
3.9×104
ATP hydrolysis reaction
3.2x104
1 g carbohydrate (4.1 kcal)
1.7x104
1 g protein (4.1 kcal)
1.7×104
Tennis ball at 100 km/h
22
Mosquito (10- g at 0.5 m/s)
1.3x10-6
Single electron in a TV tube beam
4.0x10¬15
Energy to break one DNA strand
10-19

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