How many miles per gallon does a freight train get? 492 miles How much it costs to run a train? By way of comparison, an electric train which consumes 30 kWh per train-mile at 12ยข per kWh would have a fuel cost of only $3.60 per train-mile and many trains average less. With the proviso […]
What happens if you pass electric current through a coiled conductor wire?
What happens if you pass electric current through a coiled conductor wire? Either an electric current is passed through the wire of the coil to generate a magnetic field, or conversely, an external time-varying magnetic field through the interior of the coil generates an EMF (voltage) in the conductor. The more turns of wire, the […]
What are the 3 types of serves in volleyball?
What are the 3 types of serves in volleyball? For competitive volleyball, there are three main types of overhand serves: the floater, the topspin, and the jump serve. Try them all to find out which one suits you best, but keep in mind that you will want to be somewhat proficient in all three. What […]
Can walk on Mars?
Can walk on Mars? But how will astronauts walk on Mars, where the gravity is a third of Earth’s? Volunteers walked on force-monitoring platforms while the aircraft flew up and down to recreate martian gravity. The results showed that the ideal walking speed on Mars will be only a little more than half of the […]
Can a substance be cooled to a temperature below its freezing point?
Can a substance be cooled to a temperature below its freezing point? Liquids have a characteristic temperature at which they turn into solids, known as their freezing point. In theory, the melting point of a solid should be the same as the freezing point of the liquid. It is possible, however, to cool some liquids […]
What makes a reaction dangerous?
What makes a reaction dangerous? Even slow reactions can be hazardous if they involve large amounts of material or if the heat and gases are confined, such as in a sealed storage drum. Drums that are swollen and distorted from over-pressurization are potentially very dangerous. They may rupture at any time without warning and release […]
How long is the fall equinox?
What is the working principle of scanning electron microscope?
What is the working principle of scanning electron microscope? Scanning electron microscopes (SEMs) use an electron beam to image samples with a resolution down to the nanometer scale. The electrons are emitted from a filament and collimated into a beam in the electron source. The beam is then focused on the sample surface by a […]
Who is the father of laptop?
Who is the father of laptop? Bill Moggridge What is the oldest computer component? The US-built ENIAC (Electronic Numerical Integrator and Computer) was the first electronic programmable computer built in the US. Although the ENIAC was similar to the Colossus it was much faster and more flexible. What computer was invented in 1960? Digital introduced […]
In which compound is hydrogen bonding found?
In which compound is hydrogen bonding found? Hydrogen bonding occurs only in molecules where hydrogen is covalently bonded to one of three elements: fluorine, oxygen, or nitrogen. These three elements are so electronegative that they withdraw the majority of the electron density in the covalent bond with hydrogen, leaving the H atom very electron-deficient. What […]