Question

Assuming a typical efficiency for energy use by the body, how many slices of pizza must you eat to walk for 3.0h at a speed of 5.0 km/h? Assume that your mass is 68 kg,metabolic power of 68 kg individual walking at 5 km/h is 380 W , and the energy content of slice of pizza is 1260 kJ.Number of Slices of pizza=---------

Answer 1

Answer:

n = 3.26

Explanation:

given,

human need 380 W of power to walking 5 Km/hr

human body 380 J of energy per second for walking 5 Km/h

speed of human 5 x 0.278 = 1.39 m/s  

for walking 1.39 m energy required = 380 J

distance traveled in 3 hours of walking

d = 1.39 x 3 x 3600

d = 15012 m

energy needed

$E = \dfrac{380}{1.39}\times 15012$

E = 4,104,000 J

now,

one pizza slice give 1260000 J pf energy

slice of pizza

$n = \dfrac{4104000}{1260000}$

n = 3.26