Light from two closely-spaced stars cannot produce a steady interference pattern due to
A) incoherence.
B) the inherent instability of the atmosphere.
C) their different radial distances.
D) their non-point like natures.
E) closely spaced stars not producing interference patterns.
Answer: A
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Force on a Wire: A rigid rectangular loop, measuring 0.30 m by 0.40 m, carries a current of 9.9 A, as shown in the figure. A uniform external magnetic field of magnitude 1.8 T in the -x direction is present. Segment CD is in the xz-plane and forms a 19° angle with the z-axis, as shown. What is the y component of the magnetic force on segment AB of the loop?
A. +5.1 N B. -5.1 N C. +1.7 N D. -1.7 N E. 0.0 N
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A wall consists of 2 layers of material: brick in front of an equal thickness of wood
If the respective thermal conductivities of the brick and wood are 1.3 J/m-s-C and 0.15 J/m-s-C, how does the temperature gradient across the wood compare to the gradient across the brick?