Why are there different theories about the effects of global warming?

a there has been a decrease of extreme weather.

b there is no data to support global warming.

c global climate is complex, so changes in global climate are hard to predict.

d increased levels of carbon dioxide are offset by other changes.

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.

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

Acoil suspended freely, points in some direction when no current is passed through it . can you tell what will happen when a current is passed though it?