Dark energy is speeding up the expansion of the Universe.
Answer the following statement true (T) or false (F)
True
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A total lunar eclipse is
a. visible only from the path of totality. b. visible only during a new moon. c. visible to all observers on the side of Earth from which the moon would be visible at that time. d. an opportunity to study the corona of the sun. e. none of the above
Which of the following is that form of energy associated with an object's motion?
a. potential b. thermal c. bio-chemical d. kinetic
Where and how do deltas form?
What will be an ideal response?
Addition by 1. Components: Four vectors, 
, 
, 
, and 
, are shown in the figure. The sum of these four vectors is a vector having magnitude and direction 
A. 4.0 cm, along +x-axis. B. 4.0 cm, along -x-axis. C. 4.0 cm, along +y-axis. D. 4.0 cm, along -y-axis. E. 4.0 cm, 45° above +x-axis.