Category: Physics

Is the sun bigger than the North Star? Scientists using a new telescope found the size of the North Star, also known as Polaris. It turns out that Polaris is 46 times larger than the Sun. It is no surprise to scientists, because Polaris is a cepheid star. Cepheids are special stars that pulsate at […]

Which liquid travels the slowest which liquid travels fastest? Of the three mediums (gas, liquid, and solid) sound waves travel the slowest through gases, faster through liquids, and fastest through solids. Temperature also affects the speed of sound. Why light travels fastest in vacuum? Answer. Yes light travels faster in vacuum than any other medium. […]

Which has longest half life? Bismuth-209 How long is the half-life of most nuclear waste? Radioactive isotopes eventually decay, or disintegrate, to harmless materials. Some isotopes decay in hours or even minutes, but others decay very slowly. Strontium-90 and cesium-137 have half-lives of about 30 years (half the radioactivity will decay in 30 years). Plutonium-239 […]

Is it dangerous to drive with broken shocks? Failed or broken shock absorber: A car with one or more of its shock absorbers out of commission will bounce quite a bit and may roll, squat, or dive excessively. Never drive a car with a broken shock absorber at highway speeds and avoid sudden turns or […]

Is chlorine an electrophile? A partial positive charge is gained by the carbon and the chlorine gains a partial negative charge. As you can find in halide reactions within organic chemistry, chlorine is also a nucleophile. In order to attack a double bond in alkene, Halogens can act as electrophiles. What is the mechanism of […]

What is produced in the receiving antenna when radio waves are absorbed? Radio waves are transmitted easily through air. They do not cause damage if absorbed by the human body, and they can be reflected to change their direction. Radio waves can be produced by oscillations in electrical circuits. When radio waves are absorbed by […]

What might happen to the continents of the Atlantic Ocean continues to expand? If the ocean continues to expand, North America and South America will move farther away from Africa and Eurasia. The Mid-Atlantic Ridge is responsible for the formation of Iceland. Explain how this is possible. The Mid-Atlantic Ridge is on a divergent boundary […]

How do you find volume without density and mass? A simple method based on the moment of forces and Archimedes’ principle is described for finding density without measuring the mass and volume of an object. The method involves balancing two unknown objects of masses M1 and M2 on each side of a pivot on a […]

Is beer heavier than water? For all practical purposes beer weighs the same as water, which is 8.34 lb. per gallon or 2.2 lb. If you want to be picky you can figure in the ABV of the beer and subtract the difference in weight because ethanol weighs 6.584 lb. per gallon. Is Espresso heavier […]

How do you identify cardiac muscle tissue? Cardiac muscle cells appear striated or striped under a microscope. These stripes occur due to alternating filaments that comprise myosin and actin proteins. The dark stripes indicate thick filaments that comprise myosin proteins. The thin, lighter filaments contain actin. What are three characteristics of cardiac muscle tissue? Four […]