You are using a piece of string and two tacks to draw ellipses on a piece of paper
How can you draw two ellipses with the same semi-major axes but different eccentricities? How can you draw two ellipses with the same eccentricity but with the semi-major axis of one double the other?
a. Use the same length of string for both ellipses. For the second, move the tacks further apart to increase the eccentricity.
b. Keep the tacks the same distance apart for both ellipses. For the first, half the length of the string and then draw the ellipse. For the second, use the original length of the string.
You might also like to view...
If the mass of an object were doubled while its volume remained the same, its density would
A) be half. B) double. C) stay the same. D) be four times as great.
A charged particle is moving in a magnetic field. What is the direction of the force on the particle due to the magnetic field?
a) in the direction of the magnetic field b) in the direction opposite to which the particle is moving c) in the direction that is perpendicular to both the magnetic field and the velocity d) in the same plane as the magnetic field and the velocity, but not in either of those two directions e) in the direction of motion
The uncertainty principle can be used to relate the uncertainties in which two quantities?
A) position and momentum B) the force of gravity and the force of electromagnetism C) spin and charge D) position and spin E) mass and energy
Our Milky Way is part of ________ which has about ________ member galaxies.
A. the coma cluster; 500 B. the beehive association; 100 C. the Pleiades; 3 D. the local group; 30