An engineering team is working on the design of a new hoverboard toy for children and adults. The new hoverboard must meet all safety guidelines. It must be manufactured for $75 or less, the battery should last at least 2 hours, and the hoverboard should be able to travel at least 6 mph. The table shows the results of tests for the first three designs. Hoverboard Designs
Design Cost Speed Battery Life Safety Guidelines Met
A $70 5mph 1 hour yes
B $65 8mph 2.5 hours no
C $75 6mph 2 hours yes
Identify how well each design meets the criteria and constraints.

The drive force for diffusion is 7 fick's first law can be used to solve the non-steady state diffusion. a)-true b)-false

Select any two (2) areas of applications of chain-drive. (clo4) a)-permanent lubrication necessary b)-hydraulic forklift truck operation c)-rigging and heavy moving materials d)-relatively high maintenance costs e)-costlier than belt drives

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.