Concept explainers
Make a pinhole camera, as illustrated in the figure. Cut out one end of a small cardboard box,- and cover the end with tissue paper. Make a clean-cut pinhole at the other end. Aim the camera at a bright Object in a darkened room, and you will see an upside-down image on the translucent tissue paper. In a dark, windowless room, if you replace the tissue paper with unexposed photographic film, cover the back so it is light-tight, and cover the pinhole with a removable flap, you will be ready to take a picture.
Exposure times differ, depending mostly on the kind of film and the amount of light. Try different exposure times, starting with about 3 seconds. Also try boxes of various lengths. You'll find everything in focus in your photographs, but the pictures will not have clear-cut, sharp outlines. The principal difference between your pinhole camera and a commercial one is the glass lens, which is larger than the pinhole and there-fore admits more light in less time.
To explain why does the body make a substance that can potentially damage the circulatory system which is nothing but cholesterol that usually associated with negative effects on our circulatory system.
Explanation of Solution
Introduction:
Cholesterol plays a very important role in our body. It acts as the structural component of the cell. It is the energy source of the cell. It works as important signalizing molecule.
When a person takes excess food then the lipids store the energy in the form of fat for later use, which requires for the metabolic activities. The level of cholesterol for a healthy man is
Conclusion: Due to its huge importance body makes it in itself.
Chapter 30 Solutions
Conceptual Physics: The High School Physics Program
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