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What elements are in a pencil?
Carbon in the part where you draw with and then the elements that make wood which again is mostly carbon but there are many more elements that make up wood.
What has greater density a grape or a paper clip?
Interesting question. Put the grape in water and I believe you will see it floats. It is lighter than water. Now, put a paper clip in water and you will see it sinks. So the paper clip must have a density greater than water. It has a higher density. The weight of the object does not matter. Density is weight divided by volume. You may also be wondering why some fruits float and others sink in water. Fruits contain water and sugar. This alone would make them slightly heavier than fresh tap water. However, in the skin of fruit, there are openings that contain air. Even a little air can compensate for the extra weight of the sugar. There is a second way to answer your question, you can look up the densities of aluminum (what a paper clip is made of) and water (which is approximately the density of the grape). Just enter aluminum and density into Google, and you will find the density of aluminum much higher than water (density ~ 1 gm/cc).
How many number of different known substances are there?
There are currently 117 different elements known to humankind. Those elements make up everything we know.
What are three objects with a mass of less than one kilogram?
Three common objects with a mass of less than one kilogram include a smartphone, a paperback book, and a bag of flour. These objects have masses typically measured in grams or milligrams, with a kilogram being equal to 1000 grams. It is important to note that mass is a measure of the amount of matter in an object, whereas weight is the force exerted on an object due to gravity.
If you line up human skin cells side by side which is 30um how many would fit along the length of the paper clip measuring 1cm?
1 cm is 10000 microns so 10000/30 = 333 cells
