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If an electric boat has sails as well, and will be used in deep water ( deeper than about 15 m or 50 ft ), then a towed generator can help build up battery charge while sailing ( there is no point in trailing such a generator while under electric propulsion as the extra drag from the generator would waste more electricity than it generates ).
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If and electric
If enough electricity is provided by solar panels, wind turbines, or other means, then electric heaters and stoves become a practical autonomous design.
If enough electric power is available, cooling can be provided by conventional air conditioning using a heat pump.
where Q is the electric charge transferred through the surface over a time t. If Q and t are measured in coulombs and seconds respectively, I is in amperes.
If only the electric field () is non-zero, and is constant in time, the field is said to be an electrostatic field.
If used in a permanent installation, a split sensor allows the electric current to be tested without dismantling the existing circuit.
If an electric field of one particular polarity is applied for a long period of time, this ionic material is attracted to the surfaces and degrades the device performance.
If a particle of charge q moves with velocity v in the presence of an electric field E and a magnetic field B, then it will experience a force
If they did exist, both Gauss's law for magnetism and Faraday's law would need to be modified, and the resulting four equations would be fully symmetric under the interchange of electric and magnetic fields ; see magnetic monopoles for details.
If plasma is pushed hard enough, it generates electric fields which allow it to move in response to the push, often ( not always ) deforming the magnetic field in the process.
If the user opens the protective sliding door that covers the pins, the processor can be exposed to any electric charge the user has built up.
If the dipole moment can be reversed by the application of an electric field, the material is said to be ferroelectric.
If the sunspot were isolated from the surrounding photosphere it would be brighter than an electric arc.
If the appliance is one whose purpose is for light or heat ( such as an incandescent lightbulb or electric oven ) then the lighting or heating elements may be considered as a type of fire ; if so, then turning them on constitutes both " lighting a fire " ( category 37 ) and " cooking " ( a form of baking, category 11 ), and turning them off would be " extinguishing a fire " ( category 36 ).
If this condition is met, the input electric power must equal the output power:
If the components of the computer were too large or the wires interconnecting them too long, the electric signals couldn't travel fast enough through the circuit, thus making the computer too slow to be effective.
If the wave is frozen in time, the electric field vector of the wave describes a helix along the direction of propagation.
If the applied electric field is sufficiently high, free electrons from background radiation may become accelerated to velocities that can liberate additional electrons during collisions with neutral atoms or molecules in a process called avalanche breakdown.
If more than one charge is present, the total electric field at any point is equal to the vector sum of the separate electric fields that each point charge would create in the absence of the others.
If several spatially distributed charges generate such an electric potential, e. g. in a solid, an electric field gradient may also be defined.
If this susceptibility itself depends upon the electric field, one can obtain a nonlinear optical effect of magneto-optical parametric generation ( somewhat analogous to a Pockels effect whose strength is controlled by the applied magnetic field ).
If one considers the flux of the electric field vector, E, for a tube near a point charge in the field the charge but not containing it with sides formed by lines tangent to the field, the flux for the sides is zero and there is an equal and opposite flux at both ends of the tube.
If and boat
If your state has no provisions for the numbering of pleasure boats, you must apply for a number from the U.S. Coast Guard for any kind of boat with mechanical propulsion rated at more than 10 horsepower before it can be used on Federal waterways.
If the boat floats, the mass of the boat ( plus contents ) as a whole divided by the volume below the waterline is equal to the density of water ( 1 kg / l ).
If weight is added to the boat, the volume below the waterline will increase to keep the weight balance equal, and so the boat sinks a little to compensate.
If the hydrofoils hit something the boat will fall off the foils and this often creates a perception of increased danger.
* If a storm or wave capsizes a small monohull, it may recover when the weight of the ballast in the keel rights the boat, if it does not broach and sink before it recovers.
If the boat is powerful enough, two or three people can parasail behind it at the same time.
If weather helm builds further, it can limit the ability of the helmsman to steer the boat, which can be turned towards but not effectively away from the wind.
# If both sailing vessels are on the same tack, the windward boat gives way to the leeward one ( Rule 12 )
# If a vessel on port tack is unable to determine the tack of the other boat, she should be prepared to give way ( Rule 12 )
* If the boat has an internal combustion engine anyway, then its alternator will provide significant charge when it is running.
When informed that the film was to be made in Africa, Davis refused the part, telling Jack Warner, " If you can't shoot the picture in a boat on the back lot, then I'm not interested.
If the second course were chosen, the boat would be controlled by the avant standing in front with a long paddle and the gouvernail standing in the back with a nine-foot steering paddle.
If practising live release, it is recommended to call the fish " caught " when it is alongside a boat.
If Atrahasis severed the mooring lines, the runaway boat might go down the river into the Persian Gulf.
If a dinghy is towed, an extra line with a loop in the end ( known as a lazy painter ) can be attached to a dinghy so that if the towing line breaks, there is a line to grab with a boat hook.
If the boat is not horse-drawn, it may have a refurbished, slow-revving, vintage diesel engine, and there are even some steam-driven narrow boats such as the ex-Fellows Morton and Clayton steamer President.
If the ship is very small, it is called a boat grave.
If the festival is next to a lake, renting a boat is also an attraction.
If a person came via boat, then they would remain a few days in Genoa.
* Rock splats – If the rafters load the back of the raft, they can paddle the raft into a rock on the river, having it hit the bottom of the boat instead of the nose ; if done correctly this can raise the raft up vertically on its stern.
If this happens, it is likely that the whole boat will get pulled under water.
If the central points of the application of those two forces coincide, the boat moves steadily sideways.
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