Hooke's law describes a certain light spring of unstretched length 34.2 cm. when one end is attached to the top of a doorframe and a 7.38 kg object is hung from the other end, the length of the spring is 40.0 cm. (a) find its spring constant. kn/m (b) the load and the spring are taken down. two people pull in opposite directions on the ends of the spring, each with a force of 198 n. find the length of the spring in this situation. m

4. who was the first one to measure the speed of light and conclude that it is finite? 5. who was the first philosopher who thought the speed of light is finite? 13. what is the speed of light numerically? 14. give an example of something moving faster than light 15. give an example for some particles or waves that

If it takes a planet 2.8 x 10^8 s to orbit a star with a mass of 6.2 x 10^30 kg what is the average distance between the planet and the star

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.