Some anthropological evidence for the precession of Earth's tilt is that the passage into the Great Pyramid in Egypt points at the star Thuban, which was the polestar about 6,000 years ago.
Answer the following statement true (T) or false (F)
True
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Iron meteorites are easy to recognize because a magnet can stick to them
a. True b. False Indicate whether the statement is true or false
The figure shows the orientation of a flat circular loop consisting of 50 closely wrapped turns each carrying a current I. The magnetic field in the region is directed in the positive z direction and has a magnitude of 50 mT. The loop can turn about the y axis. If ? = 20°, R = 0.50 m, and I = 12 A, what is the magnitude of the torque exerted on the loop?
?
?
A. 8.1 N ? m B. 24 N ? m C. 22 N ? m D. 13 N ? m E. 16 N ? m
If we have measured a star's apparent brightness and distance, then we can easily calculate its
A) luminosity B) mass C) surface temperature D) radius E) lifetime
Light of wavelength 580 nm is incident on a slit of width 0.30 mm. An observing screen is placed 2.0 m past the slit. Find the distance on the screen of the first order dark fringe from the center of the pattern
A) 0.26 mm B) 1.5 mm C) 1.9 mm D) 3.9 mm E) 7.7 mm