Which action makes use of a magnetic force? * A person puts a bank card in an electronic reader to buy an item.
A store clerk finds the price of an item by moving the item over a laser light.
A parent measures a child's temperature by touching a thermometer to the child's
head.
O A student measures the mass of a book using a spring scale.

What is the length x of the side of the triangle below? (hint: use the cosine function)

Waves are used in many practical applications to support work, entertainment, and health. one example is the use of ultrasound imaging to safely track the development of a growing fetus. what is a specific example of a practical application of waves in medicine, entertainment, safety, or other fields? provide a brief explanation of how the properties of waves are useful to that application.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects