Why do some parents ignore the research-backed sleep recommendations from the American Academy of Pediatrics? What can be done to get more parents to follow these recommendations?

The earth is constantly spinning on its axis, like you might spin a basketball on your finger. it is this spinning of the earth that causes

Wavelength, frequency, and energy are related. what happens to a wave as it’s wavelength gets shorter?

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?