CAPA Assignment 1 #1CAPA Assignment 1 #1CAPA Assignment 1 #2CAPA Assignment 1 #2Clicker QuestionClicker QuestionClicker questionClicker questionCAPA Assignment 1 #3CAPA Assignment 1 #3Judah Levine, 3070L8 1CAPA Assignment 1 #1CAPA Assignment 1 #1If you push a cart along a horizontal surface with a force of 21.0 pounds, and the cart moves 8.0 feet, how much work have you done in Joules?Judah Levine, 3070L8 2CAPA Assignment 1 #1CAPA Assignment 1 #1If you push a cart along a horizontal surface with a force of 21.0 pounds, and the cart moves 8.0 feet, how much work have you done in Joules? The work done is the force times the distance, or 8×21= 168 foot-pounds. From the front cover, 1 foot-pound is equal to 1.36 joules. Therefore the work in joules is 168 foot-pounds × 1.36 joules/foot-pounds = 228.5 jJudah Levine, 3070L8 3CAPA Assignment 1 #2CAPA Assignment 1 #2Your car has a mass of 1600 kg, and is traveling at a speed of 40 m/sec. What is its kinetic energy in BTU?Judah Levine, 3070L8 4CAPA Assignment 1 #2CAPA Assignment 1 #2Your car has a mass of 1600 kg, and is traveling at a speed of 40 m/sec. What is its kinetic energy in BTU?The kinetic energy is mv2/2 = 1600*402/2 =1.28×106joules. From the front cover 1 joule equals 9.49×10-4BTU. So1.28×106joules × 9.49×10-4BTU/1 joule = 1215 BTU = 1215Judah Levine, 3070L8 5Clicker QuestionClicker QuestionTaking the previous answer of 1215 BTU of kineticenergy, how much gasoline (in gallons) did it take to do this, assuming 100% efficiency?A: Less than 0.001B: About 0.01C: About 0.1D: About 0.5E: More than 0.5Judah Levine, 3070L8 6Clicker QuestionClicker QuestionTaking the previous answer of 1215 BTU of kineticEnergy, how much gasoline did it take to do this,Assuming 100% efficiency?ouncesgallonouncesgallongallonBTUgallonBTU25.1128107.9107.91025.111215335=×××=××−−B: About 0.01Judah Levine, 3070L8 7Clicker questionClicker questionHow fast is 40 m/sec?A: okay in a 20 mph school zoneB: okay in a 45 mph parkwayC: okay on a highway where limit is 55 mphD: okay on a highway where limit is 75 mphE: asking for a speeding ticket in all of theseJudah Levine, 3070L8 8Clicker questionClicker questionHow fast is 40 m/sec?Convert 40 m/sec to miles/hour:hourmilesfeetmilehourfeetmfeethrmhourm5.89528011072.4128.31044.11min60min1sec60sec4055=××=××=××E: asking for a speeding ticket in all of theseJudah Levine, 3070L8 9CAPA Assignment 1 #3CAPA Assignment 1 #3Per person, the energy consumption in the United States is about 4.1×108Btu/yr. Express this in Watts (W) Watts are joules/second, so lots of conversions:Judah Levine, 3070L8 10CAPA Assignment 1 #3CAPA Assignment 1 #3Per person, the energy consumption in the United States is about 4.1×108Btu/yr. Express this in Watts (W) Watts are joules/second, so lots of conversions:4.1×108Btu/yr × 1 year/365 days × 1 day/24 hours ×1 hour/60 minutes × 1 minute/60 seconds = 13 BTU/second × 1 joule/9.49×10-4=
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