The Great Ideas of Physics
The Great Ideas of Physics PHYS 110G
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This 0 page Class Notes was uploaded by Dovie Bednar on Sunday November 1, 2015. The Class Notes belongs to PHYS 110G at New Mexico State University taught by James Ni in Fall. Since its upload, it has received 23 views. For similar materials see /class/233195/phys-110g-new-mexico-state-university in Physics 2 at New Mexico State University.
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Date Created: 11/01/15
Homework 6 Chapter 7 Conceptual Questions LAD LAN Directly because then no heat engine is involved Electricity from a coal red generating plant because such a plant is about 40 ef cient while a car engine is only 1015 ef cient Table 71 According to Figure 720 the overall ef ciency is 900 2500 or 36 Thus 36 tons go to electricity while 64 tons are wasted as exhaust thermal energy 15 kgs x 3600 shour x 24 hrday 1300000 kgday 1300 tonnes per day No for example it stayed about level during 193035 About 150 GkWh billion kilowatt hours in 1935 about 350 GkW h in 1945 600 GkW h in 1955 1100 GkW h in 1965 2000 GkWh in 1975 Each of these numbers is roughly twice the preceding number so the growth is roughly exponential Firewood wind water behind a dam ocean thermal Chapter 7 Problems 1 N V39 05 00 0 eff Work output ThermE input so ThermE input Work e 2000 J 03 6670 J eff Work output ThermE input so Work Therm E input x eff 02 15x 106J3x 105 J The actual ef ciency is work output total energy input 1000J 750 J 1000J 250J1000J 25 From Table 71 ideal eff 018 eff Work out ThermE in so Work ThermE in x eff 500x 106Jx01890x 106 J From Table 73 the car averages 20 mi gal Thus the amount of gasoline used is 2800 mi 20 migal 140 gal By air at 34 migal Table 74 you use 82 gal By bus at 76 migal you use 37 gal By train at 144 mi gal you use 19 gal The football elds area is 100 m x 30 m 3000 m2 So solar energy strikes a football eld at an average rate of 200 wattsm2 x 3000 m2 600000 watts Chapter 8 Conceptual Questions gt1 No because the water itself actually moves downhill Yes The medium is the wheat Onehalf second later all the ripples will have moved outward by 12 wavelength so crests will be replaced by valleys and valleys will be replaced by crests One second later the surface will look just like it looks in the photo Chapter 8 Problems N 5 6 Its frequency would halve because it would take twice as long for each complete wavelength to pass If you halved the wavelength the frequency would double FM has the highest frequency The FM frequency will be 100 higher larger than the AM frequency f 13 wavess 13 Hz sf l3HZX15m5ms 10 3X108106Hz300m
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