Which of these statements is correct about newton's law on gravity? 1. it does not explain why objects exert gravitational force. 2. it does not describe the relationship between objects and forces. 3. new experiments and investigation will likely upset the laws. 4.the law of gravity is only valid on earth.

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

Which of the following list the divisions of the geologic time scale in order from longest to shortest

The horizontal blue line through the middle of the lens is called the optical axis. as the lamp is moved above or below the axis, keeping the horizontal distance to the center of the lens constant, how does the horizontal distance from the lens to the image change?