March 21st is an equinox. what part of earth is directly beneath the sun on that day? the tropic of cancer the tropic of capricorn the antarctic circle the equator

the equator    

Explanation:

Equinox means equal nights. March 21st marks the vernal equinox- a day when the sun passes directly over the equator. On this day, sunlight falls equally in both the hemispheres. This means there would equal day and night in all the parts of the world.

Thus, correct answer is equator is directly beneath the Sun on March 21st equinox on Earth.

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.