Why can velocity be negative but speed can t? 2 Answers. Remember that velocity and acceleration are vectors, they have a magnitude and direction. Speed, on the other hand, is a scalar quantity which only has magnitude. So yes, the negative sign indicates a slowing down. What does it mean when position is negative? In […]
What is the main difference between the ideas of Galileo and Aristotle?
What is the main difference between the ideas of Galileo and Aristotle? Aristotle says that the heavier things are, the quicker they will fall, whereas Galileo felt that the mass of an object made no difference to the speed at which it fell. What is the idea of Galileo about motion? Galileo was correct in […]
What is the resistance of two resistors in parallel?
What is the resistance of two resistors in parallel? Two identical resistors in parallel have an equivalent resistance half the value of either resistor. The current splits equally between the two. Does higher ohms mean more resistance? Ohms are units of resistance. The lower the resistance of your atomizer, the larger the amount of current […]
What is the purpose of theory in research?
What is the purpose of theory in research? Theories are formulated to explain, predict, and understand phenomena and, in many cases, to challenge and extend existing knowledge within the limits of critical bounding assumptions. The theoretical framework is the structure that can hold or support a theory of a research study. Why do we need […]
What are the disadvantages of analog communication?
What are the disadvantages of analog communication? Disadvantages of Analog Signals Analog tends to have a lower quality signal than digital. The cables are sensitive to external influences. The cost of the Analog wire is high and not easily portable. Low availability of models with digital interfaces. How are digital signals transmitted wirelessly? In short, […]
What happens if a child is never exposed to language?
What happens if a child is never exposed to language? Since, children could not be able to live without sheltered hands, kind gestures, support and pleasing statements. As a result, no one could tell which language the babies spoke. Actually, this was not the first language-deprivation experiment in the history. A similar experiment was conducted […]
What are the factors that pose a high risk to landslide?
What are the factors that pose a high risk to landslide? Landslides can be initiated in slopes already on the verge of movement by rainfall, snowmelt, changes in water level, stream erosion, changes in ground water, earthquakes, volcanic activity, disturbance by human activities, or any combination of these factors. What is the meaning of landslide? […]
Why is entropy of reversible process always zero?
Why is entropy of reversible process always zero? The entropy of various parts of the system may change, but the total change is zero. Furthermore, the system does not affect the entropy of its surroundings, since heat transfer between them does not occur. Thus the reversible process changes neither the total entropy of the system […]
How long do fingerprints last on different surfaces?
How long do fingerprints last on different surfaces? Fingerprints have been developed on porous surfaces (papers, etc.) forty years and later after their deposition. On non-porous surfaces, they can also last a very long time. The nature of the matrix of the latent print will often determine whether it will survive environmental conditions. How do […]
Is heat added or removed in condensation?
Is heat added or removed in condensation? A substance condenses when the pressure exerted by its vapour exceeds the vapour pressure of the liquid or solid phase of the substance at the temperature of the surface where condensation occurs. Heat is released when a vapour condenses. What happens when a solid is heated Class 9? […]