Can machine change the direction of force? Machines make work easier by increasing the amount of force that is applied, increasing the distance over which the force is applied, or changing the direction in which the force is applied. That’s because a machine doesn’t change the amount of work and work equals force times distance. […]
Is electricity and magnetism the same?
Is electricity and magnetism the same? 3) Electricity and magnetism are essentially two aspects of the same thing, because a changing electric field creates a magnetic field, and a changing magnetic field creates an electric field. (This is why physicists usually refer to “electromagnetism” or “electromagnetic” forces together, rather than separately.) How can we prevent […]
How entropy is a measure of disorder?
How entropy is a measure of disorder? Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system. The concept of entropy provides deep insight into the direction of spontaneous change for many everyday phenomena. Does entropy mean disorder? Entropy is […]
What is a DNA code?
What is a DNA code? The DNA code contains instructions needed to make the proteins and molecules essential for our growth, development and health. The cell reads the DNA code in groups of three bases. Each triplet of bases, also called a codon, specifies which amino acid? will be added next during protein synthesis. What […]
How do you interpret a negative Pearson correlation?
How do you interpret a negative Pearson correlation? Negative Correlation A negative (inverse) correlation occurs when the correlation coefficient is less than 0. This is an indication that both variables move in the opposite direction. In short, any reading between 0 and -1 means that the two securities move in opposite directions. What is negative […]
What is the difference between extensive and intensive economic growth?
What is the difference between extensive and intensive economic growth? Extensive growth in its pure form is based on quantitative increases in labour, capital and land, whereas intensive growth is derived from gains in overall productivity, i.e. increasing efficiency of labour and a better utilization of capital and other means of production. Which of the […]
How long until alcohol leaves the body?
How long until alcohol leaves the body? The average urine test can detect alcohol between 12 and 48 hours after drinking. More advanced testing can measure alcohol in the urine 80 hours after you drink. Breath tests for alcohol can detect alcohol within a shorter time frame. This is about 24 hours on average. How […]
What are interesting facts about potassium?
What are interesting facts about potassium? Potassium is the seventh most abundant element in the Earth’s crust, accounting for about 2.5% of its mass. Element number 19 is the eighth most abundant element in the human body, accounting for between 0.20% and 0.35% of body mass. Potassium is the second lightest (least dense) metal after […]
Why is LPG better than wood for fuel?
Why is LPG better than wood for fuel? (b) LPG has more calorific value and produces no pollution. So it is better domestic fuel than wood. (c) The ignition temperature of paper is less, so it catches fire easily. It does not catch fire when wrapped around aluminium pipe because aluminium absorbs the heat, so […]
What can cause diesel engine not to start?
What can cause diesel engine not to start? It’s the middle of summer and your diesel engine is having trouble getting started. The problems that can occur due to the cold weather are well-known and fairly common, such as using summer-grade fuel in winter, a bad glow plug system, slow cranking, or thick, cold oil. […]