Casually sneaking a quick peek at a photo in your mobile phone

A) adds energy to the photo.
B) subtracts energy from the photo.
C) brings you into an observer-observed relationship that intrigues some science types.
D) changes the phone itself
E) none of the above


Answer: E

Physics & Space Science

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Hubble's Law (also known as the Hubble-Lemaitre Law) can be restated as:

A. The mass-to-light ratio of a spiral galaxy is greater if its rotational velocity is also greater. B. The more distant a galaxy, the faster it is receding. C. The rotation curve of a galaxy is related to the amount of mass inside. D. The velocity curves of spiral galaxies only make sense if there exists a lot of unseen matter.

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The closest star to our solar system is Alpha Centauri, which is 4.30 light years away. A spaceship with a constant speed of 0.800c relative to the Earth travels toward the star

(a) How much time would elapse on a clock on board the spaceship? (b) How much time would elapse on a clock on the Earth?

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The water hole is a radio region with lower background noise

Indicate whether the statement is true or false

Physics & Space Science

Which type of quantity is characterized by both magnitude and direction?

a. scalar c. trigonometric b. vector d. algebraic variable

Physics & Space Science