In assessing whether fluoridated water can cause
cancer, what do the national research council,
national health service, and centers for disease
control and prevention all agree on?
osteosarcoma is so rare that there is little
need to study the risk of fluoride.
fluoride should not be added to water
according to research from dentists.
there is a need for further research.
done

Which statement is true for light passing into a medium that is more optically dense than the first medium through which it past

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 diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island