Category: Physics

Why is lifetime exercise so important? Physical activity or exercise can improve your health and reduce the risk of developing several diseases like type 2 diabetes, cancer and cardiovascular disease. Physical activity and exercise can have immediate and long-term health benefits. Most importantly, regular activity can improve your quality of life. How is the nervous […]

Why are jet engines so expensive? Jet engines are so expensive, because they are getting more and more sophisticated and fuel efficient. After landing the A380, the controls to shutdown the engine were not working. Jet engines are so expensive, because they are getting more and more sophisticated and fuel efficient. What is the difference […]

What is the SI unit used to measure force? Newtons What is the symbol for deci? Prefixes Purpose Name Symbol smaller quantities or sub units deci d centi c milli m micro μ What is the SI unit of length? The International System of Units (SI): Base units Base quantity Base unit length l, x, […]

What is the probability of a child having no freckles? Using the parents’ genotypes, each inner square is filled with a possible genotype for their child. There is a 75% probability that their child will have freckles, or a 25% chance of a child with no freckles. All Weasley children have freckles and red hair. […]

Can R22 and R410A be mixed? R-22 and R-410a are both refrigerants, true. They can both be used in air conditioners or heat pumps to cool your home during summer. You should never, ever try to mix them in the same system, or use them in a system not rated specifically for that kind of […]

How can you increase the efficiency of an inclined plane? Efficiency can be increase by using rollers in conjunction with the inclined plane. Wedge. The wedge is an adaptation of the inclined plane. It can be used to raise a heavy load over a short distance or to split a log. What is one method […]

How do you tell if a bat is rolled or shaved? Usually, when a bat is used normally, there will small indents where the ball has hit it, but with a rolled bat, those indents will be long. There could also be spots on the bat where it was held in a vise. What does […]

How many joules is a punch? 150 Joules What is the kinetic energy of a 30 gram bullet that is traveling at 200 m s? 600 Joules What happens to kinetic energy of the bullet on impact with the sand? The energy is transferred to the mass of sand. as for the bullet itself, the […]

At what speed does the Universe expand? This means that for every megaparsec — 3.3 million light years, or 3 billion trillion kilometers — from Earth, the universe is expanding an extra 73.3 ±2.5 kilometers per second. The average from the three other techniques is 73.5 ±1.4 km/sec/Mpc. Does space move faster than light? Albert […]

How do we measure weather conditions? Meteorologists use weather maps to forecast the weather. A HYGROMETER measures the water vapor content of air or the humidity. A WEATHER BALLOON measures weather conditions higher up in the atmosphere. Which tool would you use to measure rainfall? pluviometer What does a weather vane measure? Anemometers measure wind […]