Category: Physics

Why are periodic forest fires beneficial to the forest? When done in small doses, controlled burns can be beneficial to forest growth. Naturally, periodic forest fires help to clear away old brush and allow for new growth. They recycle nutrients back into the soil, disperse seeds of fire-adapted plants and burn ground cover to give […]

How can we increase the speed of motor give two ways? The speed of rotation of an electric motor can be increased by: (i) increasing the strength of the current, (ii) increasing the number of turns in the coil. What is DC motor speed? Speed of a DC Motor A = number of parallel paths. […]

What acetone Cannot dissolve? Many kinds of plastic do not dissolve in acetone. Polypropylene and nylon are unaffected, PTFE unsurprisingly handles it just fine as well. Two kinds of plastic that do dissolve in acetone are PVC and polystyrene. Why is nail polish soluble in acetone but not in water? Nail varnish does not dissolve […]

What happens when two forces are exerted in opposite direction? 1. Opposite direction :- The object do not moves his place because When the two forces act in the opposite direction , the force get cancelled when a force of same magnitude is applied on opposite direction . What happens if balanced forces are applied […]

How many amps does starter motor draw? 150 amps Why do motors draw more current when starting? An induction motor during start behaves like a short circuited transformer. Now, when supply is given to the stator windings, it draws high current at constant voltage as the windings are short circuited. This high current through the […]

Why is a 1982 D penny rare? Newly found 1982-D Small date copper cent. The Mint switched over from striking copper-alloy to copper-plated zinc planchets sometime in mid-1982 as a cost saving measure – the copper-alloy planchets were too expensive to strike and the Mint was losing money. But it didn’t end there. What are […]

Does touch up paint last? Touch Up Paint Should Last At Least 4-5 Years The smaller the damage, the better the application, the more likely the touch-up paint will last until you’re ready to move on to another car. You still need to wash and wax the car. And if other scratches or damage occur, […]

What is near and far point of a normal eye? The near point is the nearest point within the eye’s accommodation range at which an object can be positioned and still form a focused image on the retina. The far point is the limit to the eye’s accommodation range. For a normal human eye, this […]

Who is often called the father of modern aviation? Cayley was an aeronautical engineering pioneer and is often referred to as “the father of aviation.” He discovered and defined the four forces acting on a heavier-than-air flying vehicle: weight, lift, drag and thrust. Can planes fly without a tail? Can an airplane fly without a […]

How do you measure wind speed without an anemometer? A much simpler way to measure wind speed is with a ribbon tied to a stick. Once calibrated, the device will allow the casual kite-flyer or sailor an indication of the wind speed. Place the three ribbons on top of each other and tie them together […]