What instrument did navigators use to calculate the positions of the sun and the stars?

a caravel

a carrack

an astrolabe

a compass

In an isolated system, two cars, each with a mass of 1,500 kg, collide. Car 2 is initially at rest, while Car 1 was moving at 20 m/s. What is their final speed? A. 10 m/s B. 20 m/s C. 30 m/s D. 5 m/s

Why doesn't all of the energy from the sun that enters the atmosphere reach the earth? Science question for my hmwk!

Air pockets are an important part of many insulative materials. a. True b. False

What two properties show that a drink is a fluid

A model airplane with mass 0.5 kg hangs from a rubber band with spring constant 45 N/m. How much is the rubber band stretched when the model airplane hangs motionless?

Luke investigated the heating of water

In the nucleus of all atoms are sub-atomic particles called protons and neutrons. all protons have a positive charge.

In a polar covalent bond

Lindsay is late to class and is running down the hallway at a speed of 2 m/s the length of the hallway is 150 meters. How long will it take her to run down the hallway?

Which of the following is evidence that groundwater causes erosion and deposition?