Desperate need of : (
(this is the 2nd set of questions)

a 2 inch axle is driving a 12 inch wheel. the resistance force of the wheel is 75 ibs. how much effort force must be applied to the axel?

what's the ideal mechanical advantage of the wheel and axel?

a moveable pulley is used to lift an object that weighs 100 ibs. what's the ideal mechanical advantage of the pulley?

for the pulley, ideally how much effort force will be required to lift the object?

When using the ohmmeter function of a digital multimeter, the leads are placed in what position relative to the component being tested? a. parallel b. control c. series d. line

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

The thermal expansion or contraction of a given metal is a function of the f a)-density b)-initial temperature c)- temperature difference d)- linear coefficient of thermal expansion e)- final temperature f)- original length