How cold can a Stirling engine get? If you design the machine correctly, the cold end will get extremely cold. In fact, Stirling coolers have been made that will cool below 10 degrees Kelvin. Micro Stirling coolers have been produced in large numbers for cooling infrared chips down to 80 degrees Kelvin for use in […]
What is the law of electric charges?
What is the law of electric charges? Things that have the same charge push each other away (they repel each other). This is called the Law of Charges. Things that have more electrons than protons are negatively charged, while things with fewer electrons than protons are positively charged. Things with the same charge repel each […]
How can skin drag friction be reduced?
How can skin drag friction be reduced? Friction drag can be reduced by delaying the point at which laminar flow becomes turbulent. This can be accomplished by smoothing the exposed surfaces of the aeroplane by using flush rivets on the leading edges and through painting, cleaning, waxing, polishing or the application of surface coatings. Why […]
What is the best sampling method?
What is the best sampling method? Random sampling What are the 4 types of sampling? There are four main types of probability sample. Simple random sampling. In a simple random sample, every member of the population has an equal chance of being selected. Systematic sampling. Stratified sampling. Cluster sampling. What are the sampling methods? Methods […]
What are the noise control methods?
What are the noise control methods? Extraction, ventilation, cooling, openings in walls and enclosures. Instead of fitting silencers, it is often possible to achieve a 10 – 20 dB reduction in airborne noise from a duct or opening by lining the last bend in the ductwork with acoustic absorbent (foam or rockwool / fibreglass). Which […]
What does left curve mean?
What does left curve mean? The roadway ahead curves to the left. Slow your speed and keep well to the right. The sign may be accompanied by an advisory speed placard, helping you navigate the curve safely. What are the two classification of lines? How many types of lines are there? There are two basic […]
What is an ionic bond write two examples?
What is an ionic bond write two examples? An ionic bond is formed as a result of the electrostatic attraction between the positive and negative ions formed by the transfer of electrons from one atom/group to another. Examples: NaCl,KBr,etc. What is ionic and covalent bond explain with example? The two main types of chemical bonds […]
What are the common deficiency diseases?
What are the common deficiency diseases? Any currently treated or untreated nutrient deficiency or disease. These include, but are not limited to, Protein Energy Malnutrition, Scurvy, Rickets, Beriberi, Hypocalcemia, Osteomalacia, Vitamin K Deficiency, Pellagra, Xerophthalmia, and Iron Deficiency. How do you know if your body is lacking vitamins? 8 Common Signs You’re Deficient in Vitamins […]
How do gamma rays work?
How do gamma rays work? Gamma-rays have the smallest wavelengths and the most energy of any other wave in the electromagnetic spectrum. These waves are generated by radioactive atoms and in nuclear explosions. Gamma-rays can kill living cells, a fact which medicine uses to its advantage, using gamma-rays to kill cancerous cells. Why are gamma […]
Which circuit is better series or parallel?
Which circuit is better series or parallel? Two bulbs in a simple parallel circuit each enjoy the full voltage of the battery. This is why the bulbs in the parallel circuit will be brighter than those in the series circuit. Another advantage to the parallel circuit is that if one loop is disconnected, then the […]