Diagram below shows a 5 m laddar of mass 12 kg leaning against a wall of height 4m. Assuming the wall surface is smooth and ground is rough, calculate the force on the ladder by the wall and ground.

Which accurately compares concave and convex lenses?

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass

Because atoms of elements in the same group of thbecause atoms of elements in the same group of the periodic table have the same number of neutrons, they have similar properties. select the best answer from the choices provided t fe periodic table have the same number of neutrons, they have similar properties. select the best answer from the choices provided t f