1 Assignment - PHY-201-01-Physics I First convert Kelvin to Celsius and then Cel

Question

1 Assignment - PHY-201-01-Physics I First convert Kelvin to Celsius and then Celsius to Fahrenheit. DLSB Aln) 130-kg student eats a 185-Calorie doughnut. To burn-it-off decides to climb the steps of a tall building How high (in m) would he have to climb to expend an equivalenount of work 4. a. 607.9 m b. 519.9 m C.611.0 m d. 463.3 m e. 680.8 m f. 727.7m The Calorie is not the SI unit for energy. So convert it to Joules. (1 Cal = 4186 J) Now this amount of energy (in the doughnut) will equal the student's gravitational potential energy Ug mgy, where y is the height. SNON A 145-m long steel wire has a coefficient of linear expansion of -11 × 10-6 /C.. Give its change in length as the temperature changes from 20.0°C to 65.0°C 5. a. 0.08717 m b. 0.06614 m c. 0.07178 m d. 0.07369 m e. 0.05821 m f. 0.07072 m MacBook Pro

Explanation / Answer

1 cal = 4186 J

185 calorie = 774410 J

so,

by conservation of energy

initial energy = final energy

initial energy = 774410 J

final energy = potential energy

final energy = mgh

774410 = 130 * 9.8 * h

h = 607.9 m

---------------------------------

change in length / original length = coefficient of expansion * change in temperature

change in length / 145 = 11 * 10^-6 * (65 - 20)

change in length = 0.07178 m

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