The main reason for making the cover of a vacuum

flask airtight is to prevent heat loss by

A. conduction

B. evaporation

C. radiation

D. convection

You are sitting in a cart at the top of a hill on a roller coaster. You have 10,500 J of GPE. If your current mass is 55kg, how tall is the hill you are sitting on?

An organ system is best described by which of the following? A group of atoms working together A group of cells working together A group of tissues working together A group of organs working together

How can I interest my students in chemical and physical changes in matter?

Which change is the best example of a physical change? 1) a cookie baking 2) paper burning 3) ice cream melting 4) a nail rusting

When using a simple machine, the force you must overcome. A simple machine usually multiplies the effort force to exceed the this. Example: Lucy lifts a sack of potatoes using a pulley. The weight of the sack of potatoes is this.

A certain rock contains large jagged pieces of other rocks cemented by fine particles what type of rock is this explain

Could a nucleus that has one proton but no neutrons exist?

Which physical quantities has the unit kg·m·s-1?

Can an object travel at the speed of light? Why or why not?

Determine the amount of potential energy of a 5 Newton's book that is moved to three different shelves on a bookcase. The height of the shelves is 1.0 meter, 1.5 meter, and 2.0 meter