Asolid, rectangular iron bar measures 0.40 cm by 3.0 cm by 15 cm . part a find the resistance between opposing faces with crosssectional area 0.40 cm × 3.0 cm , assuming the faces in question are equipotentials. express your answer using two significant figures. r r = nothing ω submitrequest answer part b find the resistance between opposing faces with crosssectional area 0.40 cm × 15 cm , assuming the faces in question are equipotentials. express your answer using two significant figures. r r = nothing ω submitrequest answer part c find the resistance between opposing faces with crosssectional area 3.0 cm × 15 cm , assuming the faces in question are equipotentials. express your answer using two significant figures. r r = nothing ω submitrequest answer provide feedback next g

When using two-wire cable to feed a 240-v appliance that does not require a neutral wire, you should a. mark both ends of the white wire green. b. use the cable as is. c. use only the black wire. d. mark both ends and any exposed area of the white wire black.

Air is held within a frictionless piston-cylinder container, which is oriented vertically. the mass of the piston is 0.45 kg and the cross-sectional area is 0.0030 m2. initially (state 1) the pressure of the gas is sufficient to support the weight of the piston as well as the force exerted by the atmospheric pressure ( 101.32 kpa). the volume occupied by the air within the cylinder in state 1 is 1.00 liter. one end of a spring (with spring constant k = 1000 n/m) is attached to the top of the piston, while the other end of the spring is attached to a stage that can move vertically. initially the spring is undeflected and therefore exerts no force. then the stage is then moved quasistatically downward a distance of 10.0 cm, at which point the system reaches state 2. the piston-cylinder is not insulated; rather it remains in diathermal contact with the surroundings, which are at a constant temperature of 300 k. what is the change of pressure within the container?

The desk has a weight of 75 lb and a center of gravity at g. determine the initial acceleration of a desk when the man applies enough force f to overcome the static friction at a and b. also, find the vertical reactions on each of the two legs at a and at b. the coefficients of static and kinetic friction at a and b are ms = 0.5 and mk = 0.2, respectively