How can we make this object move? Force can make things move, change shape or change their speed. Some forces are direct and happen when two things touch (like a foot kicking a ball) or over a distance (such as a magnet or gravity). Friction is the force between two objects in contact with each […]
Who is the father of LED bulb?
Who is the father of LED bulb? Nick Holonyak Who invented the first LED light? Shuji Nakamura What purpose do LED lights serve? LED stands for light emitting diode. LED lighting products produce light up to 90% more efficiently than incandescent light bulbs. How do they work? An electrical current passes through a microchip, which […]
What would happen if solar winds hit Earth?
What would happen if solar winds hit Earth? The most powerful solar storms send coronal mass ejections (CMEs), containing charged particles, into space. If Earth happens to be in the path of a CME, the charged particles can slam into our atmosphere, disrupt satellites in orbit and even cause them to fail, and bathe high-flying […]
Is iron rusting in the presence of moist air a physical change?
Is iron rusting in the presence of moist air a physical change? Rust is a reddish-brown substance formed on iron when it has been exposed to fresh air and moisture for a long time. This process is a chemical change called rusting. What is the chemical reaction of rusting? Rusting is an oxidation reaction. The […]
What will be the pulse rate during heart attack?
Is TT tall or short?
Is TT tall or short? Genotype Symbol Genotype Vocab Phenotype TT homozygous DOMINANT or pure tall tall Tt heterozygous or hybrid tall tt homozygous RECESSIVE or pure short short Is blue eyes a genotype or a phenotype? Finally, the genotype of an organism with two recessive alleles is called homozygous recessive. In the eye color […]
What are the four principles of stratigraphy?
What are the four principles of stratigraphy? Steno’s laws of stratigraphy describe the patterns in which rock layers are deposited. The four laws are the law of superposition, law of original horizontality, law of cross-cutting relationships, and law of lateral continuity. Nicolaus Steno was a 17th-century Danish geologist. Which kind of unconformity is probably the […]
What are the three roles of bacteria?
What are the three roles of bacteria? In summary, bacteria are single-celled microbes without a nucleus. Bacteria play many roles in our ecosystem. Bacteria are decomposers which break down dead material and recycle it. They also can be producers, making food from sunlight, such as photosynthetic bacteria, or chemicals, such as chemosynthetic bacteria. What are […]
What does the slope of displacement time graph gives?
What does the slope of displacement time graph gives? A sloping line on a displacement-time graph shows that the object is moving. In a displacement-time graph, the slope or gradient of the line, is equal to the velocity of the object. The steeper the line (and the greater the gradient) the faster the object is […]
Which number is used in forced convection?
Which number is used in forced convection? The parameter of importance in forced convection is the Péclet number, which is the ratio of advection (movement by currents) and diffusion (movement from high to low concentrations) of heat. When the Peclet number is much greater than unity (1), advection dominates diffusion. What is the primary driving […]