Atoms and Elements Flashcards

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Verified questions

engineering

What is an undercut? Why must it be considered in chemical machining?

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engineering

A heat pump with a COP of 3.2 is used to heat a perfectly sealed house (no air leaks). The entire mass within the house (air, furniture, etc.) is equivalent to 1200 kg of air. When running, the heat pump consumes electric power at a rate of 5 kW. The temperature of the house was 7 $^\circ{}$ C when the heat pump was turned on. If heat transfer through the envelope of the house (walls, roof, etc.) is negligible, the length of time the heat pump must run to raise the temperature of the entire contents of the house to 22 $^\circ{}$ C is (a) 13.5 min (b) 43.1 min (c) 138 min (d) 18.8 min (e) 808 min

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engineering

The wind is blowing at $2 \mathrm{~m} / \mathrm{s}$ as the truck moves forward into the wind at $8 \mathrm{~m} / \mathrm{s}$ . If the air has a temperature of $20^{\circ} \mathrm{C}$ , find the friction drag acting on the top surface BCFE of the truck. Assume the boundary layer is completely turbulent.

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physics

What instrument is used to measure the average kinetic energy in a substance?

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