What is the significance of the atomic number, Z, above each atomic symbol in the periodic table?

Identify the characteristic of gravity that is incorrect,

A climber pulls down on a rope causing his body to rise up with the rope? Which law of motion is it?

A piston has an external pressure of 15.0 atm. how much work has been done in joules if the cylinder goes from a volume of 0.150 liters to 0.640 liters?

Imagine the door to a theater is opened and you are standing outside. How is it possible that you can hear the sound of the movie or play, even if you cannot see the screen or stage?

How much time is needed for a car to accelerate from 8.0 m/s to speed of 22 m/s if the acceleration is 3.0 m/s^2?

If the force applied to an object increases while the mass stays the same, the acceleration of the object.

Planetary nebulae are characterized by an emission spectrum consisting of Balmer (hydrogen) emission lines and a pair of strong emission lines at 4959˚A and 5007˚A that were quite mysterious when first seen.

What is the mass of oxygen in an oxygen tank at 20 C if the tank has a volume of 0.20 m3 and the oxygen pressure in the tank is 4.0 105 N/m2 (mass of one mole of one mole of oxygen is 16 g and the universal gas constant is 8.

What is one advantage infrared astronomy has over visible light astronomy?

A 60-kg runner raises his center of mass approximately 0.5 m with each step. Although his leg muscles act as a spring, recapturing the energy each time his feet touch down, there's an average 10% loss with each compression.