5 Wood is opaque. Which describes how
light waves can interact with wood?
A absorption and reflection
B diffraction and transmission
C reflection and refraction
D transmission and refraction

What should the power status of a circuit be when measuring resistance with an ohmmeter?

Acommercial refrigerator with refrigerant-134a as the working fluid is used to keep the refrigerated space at -35°c by rejecting waste heat to cooling water that enters the condenser at 18°c at a rate of 0.25 kg/s and leaves at 26°c. the refrigerant enters the condenser at 1.2 mpa and 50°c. if the compressor consumes 3.3 kw of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigeration load, (c) the cop, and (d) the minimum power input to the compressor for the same refrigeration load.

Which of the following forces require physical contact? tension air resistance friction magnetic force applied force