a) Estimate the numerical value of a typical walking speed (for a person) in units of mi/hr. Then, convert this value from mi/hr to m/s. (b) Next, estimate the numerical value of a typical running speed (for a person) in units of mi/hr, then convert this number to units of m/s. (c) Repeat this exercise for a typical residential driving speed. (d) Finally, consider a typical toll road or highway driving speed (not during rush hour!). Make your estimate in mi/hr and then convert to m/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.

Debris produced by mining is called

During a car accident, a 125kg driver is moving at 31m/s and in 1.5s is brought to rest by an inflating air bag. what is the magnitude of the change in momentum to the driver