why are the surface features of the moon essentially unaltered since youth

2) Two ice skaters have masses m1 and m2 and are initially stationary. Their skates are identical. They push against one another and move in opposite directions with different speeds.

A student applies a force to a wall and become exhausted. was any work done

I have to match 1-9 with the words listed below 1. made of two protons and two neutrons 2. similar to an electron; positive charge 3. orbits nucleus; negative charge 4. bundle of energy; zero charge 5. found in nucleus; positive charge 6.

While floating in space a 100.-kg robot throws a 0.800-kg wrench at 12.0 m/s toward its human partner working on the spaceship. How fast will the robot recoil?

A flat, raised area of land caused by uplift is also known as a (n) : a. upwarped mountain c. interior plain b. coastal plain d. plateau

An expert archer tried to shoot an arrow into a target lying at the bottom of a shallow pool. Even though the water did not change the direction of the arrow, the archer missed the mark by several inches.

Which of the following best describes a mechanical wave? A. A periodic disturbance of a medium. B. A movement of matter. c. A transfer of energy. D. When energy is converted from one form to another.

What is a 2d game. Give a refrence.

Two exactly similar wire of steel and copper are stretched by equal force. if the total elongation is 10cm. find how much each wire is elongated given young's modules for steel = 2*10^10 N/M^2 and Young's modules for copper 2*10^10N/M^2.

Which of the following is the FINAL step in a forecasting system? A. Validate and implement the results. B. Make the forecast. C. Select the forecast model (s). D. Gather the data needed to make the forecast.