When the person steps out of the shade she exposes about 1/3 of her exposed surface area to direct sunlight and the temperature of this exposed skin rises to 39°C. It is close to sunset, so the sun is shining more or less horizontally and the atmosphere attenuates its intensity to only 25% of its normal value of 1360 W m–2. On top of that, the person’s pale skin reflects 60% of the sun’s rays which are predominantly in the visible part of the electromagnetic wave spectrum. Estimate, just roughly, how the person’s overall radiative exchange of energy with her environment (including the sun) changes as a result of stepping out of the shade.

We want to calculate the total metabolic heat generated by a singing canary taking into account heat transfer by radiation, convection and exhaling air. the air temperature is 20 oc, canary’s body internal and surface temperature is 33oc, external body surface convective heat transfer coefficient is 25.2 w/m2 .k, temperature difference between the inhaled and exhaled air is 4.3 oc, the ventilation rate is 0.74 cc of air per second, specific heat of air is 1.0066 kj/kg.k and density of air is 1.16 kg/m3 . assume the canary’s body to be a cylinder with 7 cm diameter and 9 cm length, and heat exchange is from the side as well as the top and bottom of cylinder. calculate 1) the net rate of heat lost by radiation, assuming heat gained by the bird through radiation from the surroundings is 11.5 w; 2) rate of heat transferred by convection to the surrounding air; 3) rate of heat transferred in the exhaling air without considering any internal evaporation; 4) total metabolic power.

Need people build a dam to create a reservoir that supplies water a nearby city needs. describe two ways this action will likely affect the water cycle in the local environment. (5 points) worth 20 points

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.