Complete a short essay (no more than 150 words) discussing the following topics: -the ph scale, what it consists of and what it measures.

-What makes something acidic.

-What makes something basic.

-How H+ ions and OH- ions are distributed in acids and bases.

-What litmus paper and hydrion paper is used to measure.

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

Find the magnetic field a distance r from the center of a long wire that has radius a and carries a uniform current per unit area j in the positive z direction.

How can you increase the strength of an electromagnet?