Mechanical energy is an energy that needs a medium to travel. Kinetic energy relates to the skateboarder as he moves across the pipe, and potential relates to right before he leaps onto the pipe with his skateboard.
A physical change is when the physical properties of an object change, whereas a chemical change is when the chemical properties of an object change. Iron rusting is a result of a chemical change, because the rust was not there before. Silver tarnishing is a chemical change for the same reason. Gasoline burning is also a chemical change, because gasoline changes chemically. Therefore, metal denting is a physical change, because the shape and position of an object is a physical property, and there are no new substances being formed, which are all indications of a physical change.
Answer:
b. 2-4
Explanation:
Look at the slope of the line, between 0-2 and 4-6 the slope is only 10, but between 2-4 the slope is 20, so that's when the temperature is changing the fastest. In the same time it took for the water to increase by 20 degrees between 0-2 and 4-6, the temperature of the water increased by 40 degrees between 2-4 so that's when the change is the fastest.
Answer:
d.All of the above are correct.
Explanation:
The curve of demand moves left or right continuously. Income, patterns and preferences, related products prices as well as the population size and composition are the key factors causing demand change.