General Relativity is Einstein's theory of ________
Fill in the blank(s) with correct word
gravity or spacetime
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An observer on Earth's geographic north pole would find
a. Polaris directly overhead. b. Polaris 40° above the northern horizon. c. that the celestial equator coincides with the horizon. d. celestial equator passing directly overhead. e. that the ecliptic coincides with the horizon.
A long solenoid (n = 1 500 turns/m) has a cross-sectional area of 0.40 m2 and a current given by I = (4.0 + 3.0t2) A, where t is in seconds. A flat circular coil (N = 300 turns) with a cross-sectional area of 0.15 m2 is inside and coaxial with the solenoid. What is the magnitude of the emf induced in the coil at t = 2.0 s?
a. 2.7 V b. 1.0 V c. 6.8 V d. 0.68 V e. 1.4 V
The _____ is a measure of the rate of expansion of the Universe
A) Hubble constant B) Stefan-Boltzmann constant C) Boltzmann constant D) Planck constant
A beam is pin-connected to the tops of two identical pipe columns, each of height h, in a frame. The frame is restrained against sidesway at the top of column 1. Only buckling of columns 1 and 2 in the plane of the frame is of interest here. The ratio (a/L) defining the placement of load Qcr, which causes both columns to buckle simultaneously, is approx-imately:
(A) 0.25
(B) 0.33
(C) 0.67
(D) 0.75