In a pinhole camera, the distance between the pinhole and the screen is 10cm and is used to photograph a tree of height 5m away. if the magnification is 0.01, calculate a) The distance of the tree from the camera

b) The height of the image

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.

Contains chemical energy. a. heat b. light c. natural gas

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?