Which one of the following substances can be separated into several different elements?

A: Air

B: Iron

C: hydrogen

D: nickel

When an oxygen atom forms an ion, it gains two electrons What is the electrical charge of the oxygen ion? A. -1 B. -2 C. +1 D. +2

A bowling ball with a mass of 4.5 kg travels at a velocity of 37 m/s for 2.5 s until it stopped at the end of the lane by the ball return. What additional info is required to determine the weight of the bowling ball?

Analyze why we say an object is accelerating when we usually mean that it is speeding up and an object slowing down also is accelerating

Why is the motion of simple pendulum not strictly a simple harmonic motion

A heavy ball is hung from the ceiling by a steel wire. the instructor pulls the ball back and stands against the wall with the ball against his chin. to avoid injury the instructor is supposed to release the ball without pushing it (fig. 6-33). why?

What characteristic of a planet determines the acceleration due to gravity on it?

Which set of terms best defines what affects kinetic energy and potential energy, respectively? position, gravity gravity, position velocity, height height, velocity

You are operating a powerboat at night. You see green and white lights on another boat. What should you do?

How does Newton's second law apply to an "Egg Drop" experiment?

A 4.0-n puck is traveling at 3.0 m/s. it strikes an 8.0-n puck, which is stationary. the two pucks stick together. their common final speed is: