Which of these is a pure substance?

a. diamond

b. salt

c. ocean water

a

a and b

b and c

all of them

What type of lens is used to make objects appear smaller and clearer convex or concave?

If a hypothesis states that children who consume a large quantity of sugar in the morning will perform more poorly in school than children who do not, then what will be the independent variable?

If there were no current in the wire running through the magnet, what could you do to induce an electric current?

A device that starts or stops the flow of current

What order shows decreasing wavelength

What is the product of 3.15 m and 2.006 m with the correct number of significant figures?

Consider what happens at the moment when the block leaves the surface of the globe. Which of the following statements are correct? - The net acceleration of the block is directed straight down.

A mechanic pushes a 3.00 ✕ 103-kg car from rest to a speed of v, doing 4,680 j of work in the process. during this time, the car moves 26.0 m. neglecting friction between car and road, find v and the horizontal force exerted on the car.

Explain how latitude determines wind patterns

What is the difference between contact forces and forces that act through a force field?