A company that produces pulsed gas heaters claims their efficiency is approximately 90%. If an engine operates between 250°C and 25°C, what is its maximum thermodynamic efficiency?
A. 83%
B. 65%
C. 43%
D. 90%
E. 56%
Answer: C
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If you measure a parallax of 0.006 arc seconds from an observatory on the ground, your uncertainty will be about _____
A) 10 percent B) 75 percent C) 30 percent D) 57 percent
Calorimetry: A 35-g block of ice at -14°C is dropped into a calorimeter (of negligible heat capacity) containing 400 g of water at 0°C. When the system reaches equilibrium, how much ice is left in the calorimeter? The specific heat of ice is 2090 J/kg ? K, that of water is 4186 J/kg ? K, and the latent heat of fusion of water is 33.5 × 104 J/kg.
A. 32 g B. 33 g C. 35 g D. 38 g E. 41 g
Protostars have not been observed, but are consistent with observations of young main sequence stars
Indicate whether the statement is true or false
For normal vision, an object can be seen clearly when it is beyond the ______________
Fill in the blank(s) with correct word