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Chegg Tutors Subject Tests Chegg Tutors - Physics- Physics (AP/College Intro) Subject Test Time left: 0:54:11 Question 2 of 10 Item Name: PHYS 028 Assume Earth is a spherical blackbody of radius 6,371 km. It absorbs heat from the Sun at a rate given by the solar constant equal to 1379 W/m2. Furthermore, assume Earth has an equilibrium temperature of 278.9 K and is immersed in space, which has a témperature of 50 K. Assume the Earth radiates heat back into space equally in all directions. At what rate will the entropy of Earth increase according to this model? 5.91 x 1014 W/K 6.30 x 1014 wIK 3.69 x 1012 W/K Next > Previous

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Chegg Tutors Subject Tests Chegg Tutors - Physics- Physics (AP/College Intro) Subject Test Time left: 0:54:11 Question 2 of 1
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Answer:


Heat absorbed by the Earth is given by

TR-Sc = π(6.371 * 10°)-* 1379 = 1.758 * 10 If

Entropy increase of Earth

1.758 * 101 278.9 6.3 * 1014 W/K ㄧㄧ-( ) ㄒ

Answer: Option 2

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QUESTION 6 (a) The bar shown in Figure Q2(a) is subjected to tensile load of 150 Kn. If the stress in the middle portions is limited to 160 N/mm², determine the diameter of the middle portion. Find also the length of the middle portion if the total elongation of the bar is to be 0.25 mm. E E = 2.0 + 105N/mm². (12 marks) 150 KN 10 cm DIA 10 cm DIA 150 KN 45 cm Figure Q6(a) (b) A brass bar, having cross-section area of 900 mm², is subjected to axial forces as shown in Figure Q2(b), in which AB = 0.6 m, BC = 0.8 m, and CD = 1.0 m. Find the total elongation of the bar. E = 1.0 + 105N/mm2 . (8 marks) Page 4 of 5 B D 40 KN 70 KN 20 KN 10 KN Figure Q6(b) (TOTAL = 20 MARKS)

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Question: A 250-V, 4-pole, wave-wound d.c. series motor has 782 conductors on itsarmature. It has armature and series field resistance of 0.75 ohm. The motor takesa current of 40 A. Estimate its speed and gross torque developed if it has a flux per pole of 25 mWb Answer: Step 1 Mechanical Engineering homework question answer, step 1, image 1 Mechanical Engineering homework question answer, step 1, image 2 Step 2 Mechanical Engineering homework question answer, step 2, image 1 Step 3 Mechanical Engineering homework question answer, step 3, image 1

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Question: A 250-V, 4-pole, wave-wound d.c. series motor has 782 conductors on itsarmature. It has armature and series field resistance of 0.75 ohm. The motor takesa current of 40 A. Estimate its speed and gross torque developed if it has a flux per pole of 25 mWb Answer: Step 1 Step 2 Step 3
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