What are the only elements that exist in nature as isolated atoms

Why do most objects tend to contain nearly equal numbers of positive and negative charges?

The swimming pool at perris hill plunge is 50 feet long and 25 feet wide. if the bottom of the pool is slanted so that the water depth is 3 feet at the shallow end and 15 feet at the deep end, what is the angle of elevation at the bottom of the pool?

Acar moving south speeds up from 10 m/s to 40 m/s in 15 seconds. What is the car's acceleration? 2 m/s2 15 m/s2 30 m/s2 50 m/s2

How do ants use formic acid to stay alive

Thato walks uphill at a rate of 2.5 mi/h from the base of a 6-mi trail. At the same time, Edwin walks downhill at a rate of 3.5 mi/h from the top of the trail. How many hours pass before they meet on the trail?

Which best compares freezing and condensation? a. Both involve changes between liquids and gases. b. Both involve changes between gases and solids. c. Both involve the release of heat. d. Both involve the absorption of heat.

Suppose an endothermic reaction has a positive change in entropy greater than the heat absorbed. What can be said about the spontaneity of this reaction?

What are two ways that convention currents in the ocean distribute the suns energy?

An astronaut on a strange planet has a mass of 80 kg and a weight of 240 n. what is the value of the acceleration due to gravity on this planet?

A 165g arrow is shot straight up into the air with a speed of 16m/s reaches a maximum height of 12.0612m. a. Find the initial kinetic energy. The acceleration of gravity is 9.8m/s^2. b. Find the potential energy at its highest position. c.