It's Friday night and Hector has been assigned the noble task of baby-sitting Jacob, his 2-year old brother. He puts a crash helmet on Jacob, places him in a red wagon and takes him on a stroll through the neighborhood. As Hector starts across the street, he exerts a 58.2 N forward force on the wagon. There
is a 21.3 N resistance force against the wagon (due to friction) and the wagon and Jacob have a combined weight of 317 N. Determine the magnitude of
the net force, the mass of the wagon (with Jacob), and the horizontal acceleration of the wagon. (Note: acceleration due to gravity = 9.81 m/s/s)

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.

Astate of matter all that has define volume and can flow is a(n)

The least penetrating form of radiation is