An equinox occurs twice throughout the course of a year, when Earth’s axis points neither toward nor away from the Sun. How does an equinox affect the lengths of day and night? A. Day and night are equal in length.
B. Day is longer than night.
C. Night is longer than day.
D. The sun will not set, resulting in a 24-hour day.
E. The sun will not rise, resulting in a 24-hour night.

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

The ozone hole appears in antarctica during

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i. e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i. e. include the distance traveled to the first encounter)