How many dwarf planets are there in the solar system

A 1500 kg car traveling at 90 km/hr East collides with a 3000 kg truck traveling at 60 km/hr South. They stick together and move which direction?

What is the angle of refraction rounded to the nearest whole number?

Keep it simple and clear answers

What forces below earth's surface shape landforms?

A student performed an experiment to test the acidity of foods. Put the following steps in the order they should occur. The student records the acidity of the food. asks a question about food's acidity.

Which represents a system that is almost completely closed?

If many household substances classify as acids or bases what is the ph scale

A protostar forms once the nebular cloud condenses and the core begins

How do whales bats and dolphins use echolocation? A To scare away predators B To attract mates C To orient them selves and find food D To tell animals of there species where they are

How much force would be needed to move a car with the mass of 100kg to an acceleration of 5m/s/s?