Which of these is a mixture?

calcium

carbon dioxide

salt water

potassium

If two objects are electrically attracted to each other, 4) A) one object must be negatively charged and the other object must be positively charged. B) both objects must be positively charged. C) both objects must be negatively charged.

Why can we see the entire side of the moon during a full moon?

You are riding your bike at 9 km/h twn minutes later your speed is 6 km/h

A friend comes to you and says, "Mr. Johnson gave me an F on my paper and says I copied it, but I didn't! I showed him the bibliography and the sources, but he doesn't believe me! I'm going to drop the class.

How will the motion of the red marble placed at the edge of the flat sheet and given an initial velocity in the direction of the arrow compare with its motion on the curved sheet with a large mass in its center?

A scientist has been tracking and studying a population of deer in Yellowstone National Park. He surveys the population every six months. Usually, the population is thriving and has a gene pool with a wide variety of traits.

How long will it take a bike traveling at 5 meters per second to travel 25 meters south? A. 5 s B. 0.2 s C. 5 s south D. 0.2 s south

Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a frictionless 30.0-degree incline. The vertically hanging mass is 6.

The coordinates 40 degrees north and 100 degrees east falls in what country?

Which type of radio waves have the highest frequency and are used in radar detection? microwaves x-rays waves infrared waves gamma waves