A plunger is moving through the cylinder at a constant speed of 20 ft/sec. There is a thin film of oil SAE 10W at 100o F between the plunger and the cylinder. Assuming a linear velocity distribution across the thickness of the oil film, what are the force required to be applied on the plunger, and the corresponding power (in hp) in order to maintain this motion

What is the internal energy of 4.00 mol of diatomic nitrogen gas n2 at 455k

In a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina. what should be the radius of curvature of the cornea such that the image of an object 40.0 cm from the cornea’s vertex is focused on the retina?

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