A sphere of surface area 1.25 m 2 and emissivity 1.0is at a temperature of 100.0

Question

A sphere of surface area 1.25 m2 and emissivity 1.0is at a temperature of 100.0 degree celcius. the rate at which itradiates heat into empty space is closest to a) 9.9 mW b) 3.7 W c) 1.4 KW d) 7.1 W e) 0.71 mW A hallow steel ball of diameter 3 m barely floates in water.What is the wall thickness of the ball? (steel density = 7.87g/cm3 a) 79 cm b) 676 cm c)37 cm d) 131 cm A sphere of surface area 1.25 m2 and emissivity 1.0is at a temperature of 100.0 degree celcius. the rate at which itradiates heat into empty space is closest to a) 9.9 mW b) 3.7 W c) 1.4 KW d) 7.1 W e) 0.71 mW A hallow steel ball of diameter 3 m barely floates in water.What is the wall thickness of the ball? (steel density = 7.87g/cm3 a) 79 cm b) 676 cm c)37 cm d) 131 cm a) 79 cm b) 676 cm c)37 cm d) 131 cm

Explanation / Answer

radiating heat; W=*A*T4 T=373 K A=1.25 m^2 =5.67*10-8 W/m2K4 =>W=1372 J/s=1.4kW (b)barely floates in water the wall thickness of the ball is x 4/3**R3*1000=4/3**(R3-(R-x)3)*7.87*103 R= 1.5m =>x=0.486 m=48.6 cm=> 79 cm is thebest choice

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.