Which two forms of energy are most commonly used to cook food in an oven?

Which of the following statement is an example of sound energy that has electrical energy as its source?

When an animal or machine makes a noise, it sends sound waves out into its environment. Sometimes those sound waves bounce off other objects and the sound wave is reflected back to what made the noise. This is why you can hear your voice repeated in a cave or large empty space. What is a reflected sound wave called?

Which object only requires mechanical energy to perform its main function?

Which object requires only mechanical AND electrical energy to perform its main function?

Submarines are equipped with a system called SONAR which allows them to locate structures such as buried pipelines and sunken ships deep under the ocean's surface. SONAR works by sending out sound waves which bounce off of structures and returning them to the sub. By tracking how long it takes for the sound waves to return, the crew can determine where and how large obstacles ahead are. Which animal has an adaptation similar to SONAR to locate its prey?

A student uses a hot plate to boil water in the science lab. Which of these objects uses the same source of energy as the hot plate?

Which object requires only mechanical energy to perform its main function?

Which of the following statements is an example of the use of thermal energy?

Which forms of energy are used when you watch television?

A family decorated a tree for the holidays. They strung lights on it and plugged it in. Many colorful lights began to glow. What types of energy are being used or produced by the decorated tree?

Which forms of energy are illustrated in the picture?

Which forms of energy are illustrated in the picture?

A boy rented a saxophone so that he could practice before trying out for the school band. Which forms of energy are used when the boy plays the saxophone?