Author Question: The geometry of our universe is A) flat. B) positively curved. C) negatively curved. D) all of ... (Read 109 times)

ashley · **on:** Jul 29, 2018

The geometry of our universe is

A) flat.
B) positively curved.
C) negatively curved.
D) all of the above
E) none of the above

Question 2

What is the difference between speed, velocity, and instantaneous velocity? Give examples of each.

What will be an ideal response?

bd5255 · **Reply #1 on:** Jul 29, 2018

Answer to Question 1

Answer: A

Answer to Question 2

Answer: All describe motion, speed being the simplest. Speed is a ratio of distance traveled per unit of time. A car driving along a road, for example, may have a speed of 30 km/h. Velocity is speed but with direction stated or implied, and is therefore a vector quantity. The same car driving due north along a road has a velocity of 30 km/h north. Instantaneous velocity is the velocity at any instant. Its magnitude is shown by the reading on a speedometer. If you get a traffic ticket for speeding, it is your instantaneous velocity, not an overall average velocity, that may get you in trouble.