A person hears an echo from the top of a tower, 2.2 seconds after the sound is produced how far away is the tower from the person? Speed of the sound in the air is 332m/s

Ptolemy suggested that the earth was at the center of the solar system. copernicus suggested that the sun was at the center of the solar system.

135,000 kilometers = how many miles?

A pregnant woman goes out of her room goes to the fridgeopens a can of tuna a soda a yogurt a cookie Which one did she open first?

A boy performs 100 J of work pushing a chair a distance of 4 m. How much force does the boy use? Assume there is no friction.

Why are some materials magnetic and not others?

Which of the following statements are true? Check all that apply. O A positive charge and a negative charge attract each other. O Electric charge is conserved. O Two positive charges attract each other. O A neutral object contains no charge.

You push a shopping cart filled with groceries (total mass = 20 kg) by applying a force to the cart 30° from the horizontal. if the force you apply has a magnitude of 86 n, what is the cart's acceleration? assume negligible friction.

Two objects are made of the same material, but they have different masses and temperatures. If the objects are brought into thermal contact, which one will have the greater temperature change

A ball strikes a wall. It exerts a force of 10 N to the left against the wall and bounces off. What force does the wall exert on the ball?

A car slows down from 24 m/s to rest in a distance of 90 m. what was its acceleration, assumed constant? incorrect: your answer is incorrect. m/s2