Category: Physics

How much does it cost to run 100w light bulb? A kilowatt-hour is 1,000 watts used for one hour. As an example, a 100-watt light bulb operating for ten hours would use one kilowatt-hour….What Uses Watts in Your Home. Appliance/Equipment 100-Watt Bulb (100 W) Equivalent compact fluorescent Avg. Usage 4 hours/day 4 hours/day Monthly kWh […]

How accurate is Gaia? Even stars near the Galactic Centre, some 30 000 light-years away, will have their distances measured to within an accuracy of 20%. – The Gaia Data Processing and Analysis Consortium (DPAC) consists of more than 400 individuals who will contribute some 2000 person-years of effort to the Gaia data processing exercise. […]

What fertilizer makes plants grow faster? High-nitrogen fertilizers are known for causing huge growth in plants, which is why many types are rich in nitrogen or include it as the main component. Fertilizers high in nitrogen will also restore bright green hues to your foliage. Which fertilizer works best? Best all-purpose fertilizers Jack’s Classic 20-20-20 […]

Is Phosphorus 32 Harmful? Phosphorus-32 is an energetic beta emitter which can penetrate up to 0.8 cm into living skin tissue. Therefore, this isotope poses an external (skin) dose hazard to persons as well as a potential internal hazard. What type of radioactive decay does phosphorus-32 go through? Phosphorus-32 is a commonly used radionuclide with […]

Is Zenith the North Star? Sign up for our free daily newsletter today! We in the Northern Hemisphere are particularly lucky to have Polaris, a moderately-bright star, closely marking the north celestial pole – the point in the starry sky that’s at zenith (directly overhead) at the Earth’s North Pole. What are the 3 celestial […]

What happens when zinc reacts with HCl? When zinc reacts with hydrochloric acid it produces zinc chloride and hydrogen gas. Is Zn and HCl a chemical reaction? When zinc reacts with hydrochloric acid, the reaction bubbles vigorously as hydrogen gas is produced. The production of a gas is also an indication that a chemical reaction […]

Why do we not see the other side of the moon? We don’t see the far side because “the moon is tidally locked to the Earth,” said John Keller, deputy project scientist for NASA’s Lunar Reconnaissance Orbiter project. If the moon were a perfect sphere, then the gravity felt on the far side and the […]

Is 300 watts enough for a subwoofer? An aftermarket receiver — you might want 200 to 300 watts RMS of power. Amplified speakers with around 50 watts RMS per channel — 250 to 500 watts RMS is a good starting point. A system with 100 watts RMS per channel — having at least 1,000 watts […]

What is broaching in machining? Broaching is a machining process using a cutting tool with teeth that increase in size from front to back. In many cases, an entire surface (or multiple surfaces) can be finished in a single pass with broaching. The technique is most often applied to finish holes, splines and flat surfaces. […]

How does flow rate affect heat transfer? On the other hand, an increase in the heat transfer coefficient is observed if the area is maintained constant. Doubling the mass flow rate will result in a 92% increase in the heat transfer coefficient. However, there is a concomitant increase in the pressure drop, proportional to the […]