The pH scale measures the concentration of hydroxide ions. true or false

Matter is made out of atoms - assuming the conditions are not very extreme. In neutral atoms negative electrons orbit around the positive nucleus. The nucleus is composed of positive protons and neutral neutrons.

Explain the necessity of smoothing the output voltage before applying it to a transistor amplifier

What is the approximate weight of a 20-kg cannonball on the moon if the acceleration due to gravity is 1.6m/s^2

Any wave of any kind will change direction when it encounters an obstacle. This bending is called

Why doesn't a transformer work with direct current? why is ac required?

An environmentally-conscious student is breaking the rings from a six-pack drink holder before disposing of it. This reduces the potential for the six-pack ring to ensnare wildlife and cause ecological harm.

If the mass of a material is 49 grams and the volume of the material is 10 cm^3, what would the density of the material be?

What did you notice about crossing two heterozygous genotype?

A toll booth on a turnpike is open from 8:00 AM until midnight. Vehicles start arriving at 7:45 AM at a uniform rate of 6 veh/min. At 8:15 AM the rate drops to 2 veh/min.

A tornado lifts a truck 252 m above the ground. As the storm continues, the tornado throws the truck horizontally. It lands 560 m away from where it was picked up.