During typical urination, a man releases about 400 ml of urine in about 30 seconds through the urethra, which we can model as a tube 4 mm in diameter and 20 cm long. assume that urine has the same density as water, and that viscosity can be ignored for this flow.
a. what is the flow speed in the urethra?
b. if we assume that the fluid is released at the same height as the bladder and that the fluid is at rest in the bladder (a rea-sonable approximation), what gauge pressure in the bladder would be necessary to produce this flow? (in fact, there are additional factors that require additional pressure; the actual pressure is higher than this.)

What can be found in every skeletal muscle? a. nerves, bones, cartilage, and connective tissue b. tendons, cartilage, nerves, and blood vessels c. muscle fibers, nerves, connective tissue, and blood vessels d. tendons, nerves, blood vessels, and bones

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.

What are chlorofluorocarbons and what impact do they have on the atmosphere?