How to tell if two objects are in thermal equilibrium

1. the objects have the same temperature

2. the objects are the same size

3. the objects are touching each other

4. the objects temperatures are changing

Using the example of the skateboarder on the half-pipe, explain how kinetic and potential energy relate to the mechanical energy at different positions.

A_ is made of one or more elements chemically bonded through electron sharing

Most scientists believe the Big Bang Theory explains which of the following questions? A. How our planets and moons formed B. How our Universe began C. How the sun turns hydrogen into helium D. How fast light travels through space

What is the momentum of a car with a mass of 9kg and a velocity of 2m/s? Do not write units in your answer. Round to the nearest whole number.

The diagram shows the set-up for an electric doorbell. Which best explains why the bell would not ring in this set-up? The circuit is open. The electromagnet has an iron core. The circuit is closed. The electromagnet is made of steel.

If the resistance of a circuit increases, that means that the current has to

One watt is equal to which of these values? 1 joule/hour 1 joule-hour 1 joule/second 1 joule-second

What are some of the benefits of learned optimism that have been found in research? O A. Fewer health problems O O B. All of these C. Making more money O D. A lower divorce rate

Katie runs 6 km in 0.6 hour, then 5 km in 0.5 hour. Katie's average speed is __ per hour.

A derived unit is a combination of fundamental units. Which of the following is an example of a derived unit? a) centimeter (used to measure distance) b) gram (used to measure mass) c) cubic centimeter (used to measure volume)