What is the color of lava at its hottest? Help asap

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving

Which system of units is used by only a small number of countries in the world, including the u.s.

Consider lifting a box of mass m to a height h using two different methods: lifting the box directly or lifting the box using a pulley (as in the previous part). what is wd/wp, the ratio of the work done lifting the box directly to the work done lifting the box with a pulley?