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
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Which type of quantity is characterized by both magnitude and direction?
a. scalar c. trigonometric b. vector d. algebraic variable
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?
The water hole is a radio region with lower background noise
Indicate whether the statement is true or false
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.