If element X has 42 protons, how many electrons does it have?

What are some examples of the 3rd law of motion?

Can a body possess both kinetic and potential energy

Galileo had some unique personality traits. He was highly curious and observant, had the courage to challenge authorities and preconceived notions, and always held truth over everything else. Give evidence from his life to support this statement.

Describe the role of protons, neutrons, and electrons in determining the properties of an atom?

A stone is dropped from a tower of height 3600cm. Find the velocity by which it strike the ground. Also, find the time taken to reach the ground.

Which best describes convection? It relies on the collision of particles within or between substances. It occurs in solids, liquids, or gases that are heated. It results when portions of a liquid cool and rise.

A 384 m long train is moving on a straight track with a speed of 77.3 km/h. The engineer applies the brakes at a crossing, and later the back of the last car passing the crossing with a speed of 19.5 km/h.

If a girl is standing in front of a smooth surface from which a sound is reflected the girl may hear

The buoyant force acting on an object is always equal to A. the weight of the submerged portion of the object B. the mass of the submerged portion of the object C. the weight of the fluid the object displaces

Which of the following statements are true about gravity? Check all that apply. A. Gravity doesn't exist between two stars that are far far away from each other. B. Gravity exists only near Earth. C.