Acounterflow double-pipe heat exchanger is used to heat water from 20 to 40◦c by cooling an oil from 90 to 55◦c. the exchanger is designed for a total heat transfer of 59 kw with an overall heat-transfer coefficient of 340 w/m2 · ◦c. calculate the surface area of the exchanger.

Choose each of the settings that follow and list them below do it ill mark brainliest first object= position= speed= acceleration= second object= position= speed= acceleration=

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?

When barack obama was running for president, at a campaign stop he tried to bowl, something he isn't very good at. the media loved it because he threw a gutter ball while they were all watching. this is an example of: