Coffee beans are roasted by floating them with a column of hot air at 250°c. if the beans start at 22°c and are done when they reach 200°c, how long does this process takewith average convection of h =20 w/m2°c? assume the coffee beans have typical volume and surface areas of 44 mm3 and 66 mm2 respectively, a conductivity of 0.184 w/m°c, specific heat of 2.564 kj/kg °c and a density of 552 kg/m3. assume that the beans are relatively dry at the start of this process and evaporative losses can be neglected.

Aquarterback pedals 3.3meters southward and then run 5.7meters northward. whats the distance ? and whats the displacement?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 2 options: the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the cold balloon expands and rises. the warm balloon shrinks and sinks. the warm balloon expands and rises. the cold balloon shrinks and sinks.

What does si stand for,when referring to a system of measurement