How much energy is stored in a room 3.0 m by 4.0 m by 2.4 m due to the earth's magnetic field with a strength of 5.0 × 10-5 T? (?0 = 4? × 10-7 T ? m/A)
A) 575 mJ. B) 570 mJ. C) 29 mJ. D) 100 mJ. E) 10 mJ.
C
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Projectile Motion: The horizontal and vertical components of the initial velocity of a football are 16 m/s and 20 m/s respectively. If there is no air resistance, how long does it take the football to reach the top of its trajectory?
A. 1.0 s B. 2.0 s C. 3.0 s D. 4.0 s E. 5.0 s
The power of American automobiles is usually rated in "horsepower." What other units could be used?
A) watts B) joules C) Calories D) None of the above. E) All of the above.
A heat conducting rod, 0.90 m long, is made of an aluminum section that is 0.10 m long, and a copper section that is 0.80 m long. Both sections have cross-sectional areas of 0.00040 m2
The aluminum end is maintained at a temperature of 40°C and the copper end is at 150°. The thermal conductivity of aluminum is 205 W/m?K and of copper is 385 W/m?K. Steady state has been reached, and no heat is lost through the well-insulated sides of the rod. The temperature of the aluminum-copper junction in the rod is closest to A) 61°C. B) 58°C. C) 56°C. D) 54°C. E) 52°C.
What are the observational pieces of evidence that confirm the existence of a three-part structure (bulge, disk, halo) to the Milky Way Galaxy?
What will be an ideal response?