When the Universe was young, it was
A. denser.
B. smaller and less dense.
C. bigger and hotter.
D. smaller and colder.
E. bigger and colder.
Answer: A
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The frequency of a periodic wave is 340 Hz. The period of the vibration motion of the wave is
A. 2.56 milliseconds. B. 2.94 milliseconds. C. 3.55 milliseconds. D. 3.94 milliseconds. E. 4.25 milliseconds.
As it orbits the Earth, the Moon appears to move eastward about its own diameter every hour
Indicate whether the statement is true or false
King Kong falls from the top of the Empire State Building, through the air (air friction is present), to the ground below
How does his kinetic energy (K) just before striking the ground compare to his potential energy (U) at the top of the building? A) K is equal to U. B) K is less than U. C) K is greater than U. D) It is impossible to tell.
A wire that is 1.0 mm in diameter and 3.5 m long stretches 3.5 mm when an 8.0-kg tool is hung from it
(a) What is Young's modulus for the material from this wire is made? (b) What is the effective spring constant for the stretching wire? What will be an ideal response?