Why was Copernicus's heliocentric model not believed until gailileo and Kepler provided more evidence?

A skipper on a boat notices wave crests passing the anchor chain every 5 seconds. the skipper estimates the distance between crests is 15 m. what is the speed of the water waves?

What is a nanotoxin and what areas can they be found in?

A geologist needs to measure the density of an irregularly shaped pebble. a Describe how she can find its volume by the method of displacement. b What other measurement must she make if she is to find its density?

Two cars are traveling along perpendicular roads, car A at 40 mph, car B at 60 mph. At noon, when car A reaches the intersection, car B is 90 miles away and moving toward it. Find the rate at which the distance between the cars is changing at 1 P.

The second law of thermodynamics states that (select one): a. energy is the ability to do work. b. useful energy is lost when converting from one form of energy to another. c. energy can neither be created nor destroyed. d.

What does deltaX mean in physics?

Which activity involves using fossil fuels directly or indirectly? 1) eating fresh fruit for a snack 2) cooking hot dogs on a campfire 3) using crayons to color 4) walking to school

Which of the following objects would have the most inertia? A. A sphere with a radius of 5 cm and a mass of 34 grams. B. A sphere with a radius of 4 cm and a mass of 15 grams. C. A sphere with a radius of 8 cm and a mass of 27 grams. D.

A boy slides a book across the floor using a force of five and over a distance of 2M what is the kinetic energy of the book after he slides at assume there is no friction

Where would aliens be if they really do exist here on Earth?