A 7.0-kg pipe is hung from a steel wire that is 2.5 m long and has a diameter of 0.75 mm. Young's modulus for steel is 2.0 1011 N/m2. (a) By what distance does the wire stretch? (b) If the wire diameter were doubled, what would be the stretch?
What will be an ideal response?
Question 2
What is the net power that a person with surface area of 1.20 m2 radiates if his emissivity is 0.895, his skin temperature is 27C, and he is in a room that is at a temperature of 17C? ( = 5.67 10-8 W/m2 K4 )
A) 65.7 W B) 60.3 W C) 64.8 W D) 68.4 W E) 62.6 W
A young elephant in Zimbabwe.
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Sample hypnograms of children, young adults, and older adults