Which of the following is a mixture?

A. steel

B. water

C. oxygen

D. gold

If you have to apply 40 N of force to a crowbar to lift a rock that weighs 400 N, what is the actual mechanical advantage of the crowbar?

What did the ancient Greeks determine that was the first step in understanding distances in the universe? - the distance from Athens to Rome - the diameter of the moon - Earth's circumference - the distance to the sun

Nitrate (NO3-), ammonium (NH4), and carbonate (CO32-) are examples of polyatomic ions.

What is true of systems in terms of their size and boundaries?

What are some of the technological improvements made in the field of television over the past ten or 15 years

Which of the following are the top two job expectations of people who career plan? Select all that apply. A. Hours B. benefits C. type of work D. coworkers E. security

Define the term volt.

A baseball player was hit by a baseball in the left eye and complains of double vision. What should you do? A. Restrict spinal movement B. Assess pupillary response C. Perform a detailed exam D. Apply ice to orbit

An approaching storm is moving at 15 km an hour what do you need to know to determine its velocity

How did astronomers precisely determine the length of an Astronomical Unit in the 1960s?