Two spheres are attracted to each other through the force of gravity. If you triple the distance between the two spheres what happens to the force of gravity between them? A. It is 6 times less than the original force
B. It is 9 times less than the original force
C. It is 6 times greater than the original force
D. It is 9 times greater than the original force

What is the order of the moon, earth, and sun in a lunar eclipse and a solar eclipse?

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

Which one of the following research methods can show cause and effect