Our current theories are unable to describe the conditions of the universe during the Planck era. About how long after the Big Bang did the Plank era end?
A) 10-10 second
B) 10-35 second
C) 10-43 second
D) 3 minutes
E) 380,000 years
C) 10-43 second
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A jogger runs halfway around a circular path with a radius of 70 m. What, respectively, are the magnitude of the displacement and the distance jogged?
a. 70 m, 220 m c. 140 m, 220 m b. 70 m, 440 m d. 140 m, 440 m
A metal block sits on top of a floating wooden block. If the metal block is placed on the bottom of the beaker, what happens to the level of water in the beaker?
Intensity of Sound: The intensity at a distance of 6.0 m from a source that is radiating equally in all directions is 6.0 × 10-10 W/m2. What is the intensity level in dB? The threshold of human hearing is 1.0 × 10-12 W/m2.
A. 18 dB B. 23 dB C. 28 dB D. 32 dB
The Aswan High Dam on the Nile River in Egypt is 111 m high. What is the gauge pressure in the water at the foot of the dam? The density of water is 1000 kg/m3
A) 1.11 × 102 Pa B) 1.09 × 106 Pa C) 1.11 × 105 Pa D) 1.09 × 103 Pa E) 1.16 × 106 Pa