) Imagine that our Sun were magically and suddenly replaced by a black hole of the same mass (1 solar mass). How would Earth's orbit change?
A) Earth would almost instantly be sucked into oblivion in the black hole.
B) Earth would orbit faster, but at the same distance.
C) Earth would slowly spiral inward until it settled into an orbit about the size of Mercury's current orbit.
D) It would not change; Earth's orbit would remain the same.
D) It would not change; Earth's orbit would remain the same.
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If the universe is closed and finite, then
a. the universe will expand forever b. the universe has a center c. the universe has an edge d. none of the above
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What will be an ideal response?
A hollow circular post ABC (see figure) supports a load P1 = 16 kN acting at the top. A second load P2 is uniformly distributed around the cap plate at B. The diameters and thicknesses of the upper and lower parts of the post are dAB = 30 mm, tAB = 12 mm, dBC = 60 mm, and tBC = 9 mm, respectively. The lower part of the post must have the same compressive stress as the upper part. The required magnitude of the load P2 is approximately:
(A) 18 kN
(B) 22 kN
(C) 28 kN
(D) 46 kN
How many protons does Tc have?
a. 93 b. 58 c. 48 d. 107 e. 43