Why is copper a pure substance

Kik wants to cook popcorn on the stove. What type of energy will she be using

A student initially at rest on a frictionless frozen pond throws a 1 kg hammer in one direction. After the throw, the hammer moves off in one direction while the student moves off in the other direction.

ismarelda has enough money to purchase 25 bottles of root beer for a party at her house. she is expecting 3 guests.

What would be the final size of a balloon, at - 18*C, if the initial volume is 2.0 L and the initial temperature is 20*C?

If it costs $0.15 per kWh how much did it cost to leave your light on for those 8 hrs?

Use your knowledge of the state of matter and the other physical properties of matter to write an explanation for what may have caused the following situation: Although it hasn't rained in a week, every morning the grass and the car windows are wet.

What is three example of technology

Lisa has three classes that each last 50 minutes qhat ia the total nuber of minutes of minutes of the three classe?

Which has a greater speed a heron hat travels 600m in 60 seconds or a duck that travels 60 m in 5 seconds? Explain

A machine shovel moves dirt at the rate of 1,100 pounds of dirt 1 foot in 1 second. How many horsepower is this?