A device that measures absolute air pressure is called a barometer
Indicate whether the statement is true or false
T
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Solenoid: An ideal solenoid with 400 turns has a radius of 0.040 m and is 40 cm long. If this solenoid carries a current of 12 A, what is the magnitude of the magnetic field at the center of the solenoid? (?0 = 4? × 10-7 T ? m/A)
A. 16 mT B. 4.9 mT C. 15 mT D. 6.0 mT E. 9.0 mT
Total Internal Reflection: A light beam with wavelength 440 nm in a certain material then enters air and its wavelength becomes 577 nm.(a) What is the index of refraction for the material?(b) At what angle with the plane of the surface will the light be totally reflected back into the material?
Fill in the blank(s) with the appropriate word(s).
Which of the following statements about halo stars is false?
A) Halo stars have random orbits about the Milky Way center. B) Halo stars are no longer being formed at the current epoch. C) All halo stars are less massive than our Sun. D) Halo stars are made entirely of hydrogen and helium with no heavy elements. E) Halo stars are some of the oldest known objects in the universe.
The voltage supplied to an ac circuit is given by v = 120 sin(377t). What is the voltage at 
A. 0.00 V B. 2.37 V C. 63.0 V D. 109 V E. 119 V