The resistance of metals is often temperature dependent. the dependence is characterized by the temperature coefficient of resistance (tcr), which is related to temperature according to r=rref[1+tcr*(t-tref)] over limited temperature range. rref is the resistance at some temperature tref. if the tcr of a platinum wire is 0.00393/°c and its resistance is known to be 20.1 ω at 25°c, what is the temperature of the wire if its resistance is 19.5 ω?

Amira pulls a 3 pound wagon 4 feet. how much work has she done?

An ideal otto cycle has a compression ratio of 10.5, takes in air at 90 kpa and 40°c, and is repeated 2500 times per minute. using constant specific heats at room temperature, determine the thermal efficiency of this cycle and the rate of heat input if the cycle is to produce 90 kw of power.

Acarpenter builds an exterior house wall with a layer of wood 2.9 cm thick on the outside and a layer of styrofoam insulation 2.3 cm thick on the inside wall surface. the wood has k=0.080w/(m⋅k), and the styrofoam has k= 0.010 w/(m⋅k). the interior surface temperature is 19.0 ∘c , and the exterior surface temperature is -15.0 ∘c . a.)what is the temperature at the plane where the wood meets the styrofoam? celsius b.)what is the rate of heat flow per square meter through this wall? /m^2