Which of the following is a physical change?

A.) sawing a piece of wood.

B.) burning a piece of wood.

C.) rust forming on an iron fence.

D.) a copper roof changing color from green to red.

This is a slide of human cheek cells. After scraping the inside of their mouths, students in Ms. Gordon's class smeared the swab on a slide and stained them blue. These cells are parts of a large, complex organism, a human. But these cells.

How do magnets act when they are near each other?

What is the approximate terminal velocity of a sky diver before the parachute opens

The process of a liquid becoming a gas is call what

5. Which describes the reaction of a substance to form one or more nen substances? a chemical change a change of state a physical change

Two tiny beads are 25 cm apart with no other charges or fields present. Bead A carries 10 µC of charge and bead B carries 1 µC. Which one of the following statements is true about the magnitudes of the electric forces on these beads

A ball is thrown straight up at 20 m. What is the balls velocity as it hits the ground?

Block 1 and Block 2 have the same mass, m, and are released from the top of two inclined planes of the same height making 30 degree and 60 degree angles with the horizontal direction, respectively.

Water waves change direction when they encounter water of different depths and begin to move at different wave speeds. This is called A. reflection B. constructive interference C. the Doppler effect D. refraction

Along with an alpha particle what other product is produced in the alpha decay of americium-241