Given the observed average distance between galaxies today, which statement is true?
A) The faster the past expansion rate, the younger the age of the universe.
B) The faster the past expansion rate, the older the age of the universe.
C) The age of the universe depends only on the average distance between galaxies, not on the rate of expansion.
A) The faster the past expansion rate, the younger the age of the universe.
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AC Generator: You wish to construct a simple ac generator with a maximum output of 12 V when rotated at 60 Hz. A magnetic field of 0.050 T is available. If the area of the rotating coil is 100 cm2, how many turns are needed?
Fill in the blank(s) with the appropriate word(s).
A beetle runs an erratic pattern on a square kitchen table that is 1.5 m on a side. The sides are arranged along the directions North/South and East/West. If he begins at the Southwest corner, and travels along one side to the adjacent corner in 20.0 s. He then turns north, and reaches the Northeast corner 12.5 s later. What is the magnitude of his average velocity for the whole trip?
A. 0.092 m/s B. 0.098 m/s C. 0.065 m/s D. 0.033 m/s
A 0.13-m string, fixed at both ends and vibrating in its n = 4 harmonic, excites a pipe that is long and open at both ends, into its second overtone resonance
What is the speed of transverse waves on the string? The speed of sound in air is 345 m/s. A) 30 m/s B) 38 m/s C) 36 m/s D) 32 m/s E) 34 m/s
Spaceman Speff orbits spherical asteroid X with his spaceship. To remain in a circular orbit at 421 km from the asteroid's center, he should maintain a speed of What is the mass of planet X? (G = 6.67 × 10-11 N ? m2/kg2)
A) 4.0 × 1019 kg B) 5.1 × 1017 kg C) 4.0 × 1016 kg D) 5.1 × 1014 kg