An electric motor has a rating of 4.0 x 10^2 watts. how much time will it take for this motor to lift a 50.-kilogram mass a vertical distance of 8.0 meters?

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics

The ability to make things happen is also called a. heat b. force c. matter d. energy

The gun from the crime scene shows tool marks where the serial numbers are ground off. there are also tool marks on the bullets left behind. what information can the tool marks on the bullets and gun provide about the crime? what type of evidence does this information provide, individual or class?