When the curve of a vertical structure matches the inverted image of a drooping chain held at both ends, the curve is called a
A) parabola.
B) hyperbola.
C) catenary.
Answer: C
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A model rocket of mass, m, is fired upward from a launch pad with some initial speed, v. A gravitational force is exerted on the rocket
1.at all points in its motion except at it highest point. 2.at all points in its motion. 3.at no points in its motion. 4.at none of these choices.
Components: A vector 
has components Ax = 12.0 m and Ay = 5.00 m.(a) What is the angle that vector 
makes with the +x-axis?(b) What is the magnitude of vector 
?
Fill in the blank(s) with the appropriate word(s).
A 1.5-kg mass has an acceleration of 
. Only two forces act on the mass. If one of the forces is 
, what is the magnitude of the other force?
A. 4.1 N B. 6.1 N C. 5.1 N D. 7.1 N E. 2.4 N
Discuss the relationship between young stars and the interstellar medium
What will be an ideal response?