Most street lights are made from one or two elements mercury or sodium. Explain why astronomers preferred that cities you sodium streetlights instead of mercury streetlights

If there are 20 Earthworms in a garden that covers 5 square meters, what is the population density of the earthworms? A. 20 Earthworms B. 4 C. 100 Earthworms per square meter D. 4 Earthworms per square meter

If a ball is launched horizontally at 40 m/s from a bridge, what will be the magnitude of its horizontal velocity after 3 seconds?

Eleonora is learning about the nervous system in school. She learns the nervous system is made up of many parts. What is the main purpose of the nervous system in the human body? A. Releasing hormones to regulate body functions. B.

A 1.9 m-long barbell has a 25 kg weight on its left end and a 37 kg weight on its right end. A) If you ignore the weight of the bar itself, how far from the left end of the barbell is the center of gravity?

North Africa is famous for its hand-woven carpets. A-true B-false

Sara tells Michael she is 160 centimeters tall, while Michael says

Express 9.39 x 109 seconds in terms of days

What is the energy equivalent of 5.0 kg of mass? be sure to show all work to support your answer?

An ant carries food at a speed of 1 cm/s. How long will it take the ant to carry a cookie crumb from the kitchen table to the ant hill, a distance of 50 m? Express your answer in seconds, minutes and hours.

What must you know in order to determine the gravitational force between two objects?