Category: Physics

What is an unknown resistance? Your unknown resistance is . between D and B points denote voltage drop across a Galvanometer. Now, change R2 variable resistor and tune it until the Galvanometer shows zero deflection. Once the Galvanometer shows zero deflection, the value of R2 is noted and hence unknown resistance can be known by […]

Is a Kelvin hot or cold? The Kelvin scale is similar to the Celsius scale. Zero degrees is defined as the freezing point of water in the Celsius system. However, the zero point in the Kelvin scale is defined as the coldest possible temperature, known as “absolute zero”. Absolute zero is –273.15° C or –459.67° […]

Are the polar caps melting? North Polar ice cap melting The area covered by sea ice ranges between 9 and 12 million km2. According to the National Snow and Ice Data Center, “since 1979, winter Arctic ice extent has decreased about 4.2 percent per decade”. How long will it take for polar ice caps to […]

Can you die on an escalator? As a result, there does not currently exist a national system for recalling defective escalator parts. Although there appears to be a glaring lack of oversight, escalator-related deaths in the United States are actually quite rare – according to the National Library of Medicine. Which is the world’s shortest […]

Why salt water makes you float? When salt is dissolved in water, as it is in ocean water, that dissolved salt adds to the mass of the water and makes the water denser than it would be without salt. The denser the salt water, the easier it is for objects to float on top of […]

How many pounds is 200 in KG? 90.718 kilograms What weight is 200 kg in stones and pounds? Kg/grams to stones and pounds converter kilogram (kg) gram (g) or stones (st) pounds (lb) + 200 kg = 200000 g = 31 stones and 6.92 pounds • Value in stones only: 31.5 • Value in pounds […]

How accurate are liquid thermometers? Liquid-in-glass thermometers without mercury are not as accurate, so they should be used when less precision and certainty is acceptable. Because of this, accuracy can fluctuate based on the surface being measured. Entry-level infrared thermometers can range from $80 to $120. How would you dispose of the mercury if a […]

How does science help you in life? Scientific knowledge can improve the quality of life at many different levels—from the routine workings of our everyday lives to global issues. Science informs public policy and personal decisions on energy, conservation, agriculture, health, transportation, communication, defense, economics, leisure, and exploration. Is science a hard skill? Technical skills […]

Which force pulls objects to the ground? Gravitational force Which forces act on a skydiver who is falling at terminal velocity? As the skydiver gains speed, their weight stays the same but the air resistance increases. There is still a resultant force acting downwards, but this gradually decreases. Eventually, the skydiver’s weight is balanced by […]

Is work done by a battery always equal to? No, the work done by a battery is not always equal to the thermal energy developed in the electrical circuit. In case of a non-ideal battery, the work done by the battery is the sum of the thermal energy developed in the electric circuit and the […]