Physics, 29.03.2021 06:20 jamarstand
A 320W electric blanket is left on for 8 hours. How many KWh or electrical energy is used? If the unit is 8 cents. What is the cost of using the electric blanket each evening?
Answers: 3
Physics, 22.06.2019 05:30
What are similarities and differences of reflection, refraction, diffraction and absorption?
Answers: 1
Physics, 22.06.2019 06:30
Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)
Answers: 1
Physics, 22.06.2019 12:30
Consider a 1000 w iron whose base plate is made of 0.5 cm thick aluminum alloy 2024-t6 (ρ = 2770 kg/m3 and cp = 875 j/kg°c). the base plate has a surface area of 0.03 m2. initially, the iron is in thermal equilibrium with the ambient air at 22°c. assuming 90% of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 200°c.
Answers: 1
A 320W electric blanket is left on for 8 hours. How many KWh or electrical energy is used? If the un...
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