Category: Physics

Is mutual inductance always positive? The mutual inductance LM can be either positive or negative depending on the polarity of the mutual voltage in reference to the direction of the inducing current. Note that the mutual voltage in the second coil can be positive or negative based on the orientation of the coils. Why is […]

How do I know my PNP and NPN sensor? Watch the meter display as you force the sensor to output. If the readout changes to a number between 10 and 30, then the sensor output is a PNP type, also known as “sourcing.” If the meter display remains at “0”, then the sensor output is […]

How does bullet kill? Concentrated into a tiny surface area at the bullet tip, it can easily break through your skin. And once it does, that energy and momentum tears through your body, ripping a hole through blood vessels, muscle, and potentially vital organs. No wonder it can kill you. Does a headshot kill instantly? […]

What is the difference between horizontal and vertical bar graphs? The title of the horizontal bar graph tells about the data being represented by the graph. The vertical axis represents the data categories. The horizontal axis represents the values corresponding to each data value. When using the bar graph the width of the bars must […]

Who has played at the most World Cups? Soccer players with the most appearances at the FIFA World Cup from 1930 to 2018 Number of appearances Lothar Matthäus (Germany) 25 Miroslav Klose (Germany) 24 Paolo Maldini (Italy) 23 Uwe Seeler (Germany) 21 Has the US ever made it to the World Cup final? The United […]

Who is the most famous woman scientist? Today on our Science Blog, we’ll take a look at some of the most famous women scientists and their achievements. 1- MARIE CURIE. 2- JANE GOODALL. 3- MARIA MAYER. 4- RACHEL CARSON. 5- ROSALIND FRANKLIN. 6- BARBARA MCCLINTOCK. 7- RITA LEVI-MONTALCINI. 8- GERTRUDE ELION. Who was the greatest […]

Can a clam leave its shell? Since their exoskeleton is not shed, shells must enlarge to accommodate body growth. Certain kinds of clams, in early stages of life possess a gland that produces a thread-like material (byssus) that serves to anchor them to grains of sand or rocks. Do clams have hearts? A clam’s shell […]

How is water turned into ice instantly? Sharply knock a bottle of supercooled liquid water on the table and it instantly turns to slushy ice before your eyes. You put a plastic bottle of soda pop or water in the freezer for a few minutes to get it ice cold. How long does it take […]

What is survival of the fittest examples? In a habitat there are red bugs and green bugs. The birds prefer the taste of the red bugs, so soon there are many green bugs and few red bugs. The green bugs reproduce and make more green bugs and eventually there are no more red bugs. Who […]

How long should a discussion be in a lab report? The discussion will also include an analysis of random and systematic errors. A typical length for this section will be 4 pages of double-spaced text but, depending on the complexity of the experiment, more text is sometimes needed. What should be included in a discussion? […]