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VLD [36.1K]
4 years ago
8

Assuming a typical efficiency for energy use by the body, how many slices of pizza must you eat to walk for 2.5 h 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.
Physics
1 answer:
larisa86 [58]4 years ago
6 0

Answer:

2.7 Pizzas.

Explanation:

The power required to walk through 5km in 1 hour is 380W.

A watt is basically Jules per second, then we need to standardized this measurement to second.

5km/hr is equal to,

\frac{5km}{hr}*\frac{1hr}{3600s}*\frac{1000m}{1km}=1.389m/s

Walking by 2.5 hours is equal to a distance of,

d=v*t=1.389*(2.5*3600) = 12500m

The total energy required then would be,

E = \frac{380J}{1.389m/s}(12500)=3.4199*10^6J

Then we know that one pizza slice gives 1260*10^3J of energy, the total pizza needed are,

\eta = \frac{3.4199*10^6}{1260*10^3} = 2.7142

<em>Then you need to buy 3 pizza.</em>

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Answer: 246GW

Explanation:

Radiation is known as one of mode of heat transfer. During radiation, power generated by a radiating body is directly proportional to the area of the body and the fourth power of its absolute temperature.

Mathematically, R = eAR⁴

Where e is the proportionality constant known as emissivity of the body and it varies depending on the body considered. Since the body is a black body e = 1 (perfect body)

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