Category: Physics

How can you prove that sound is produced by vibration? Take a rubber string stretch it tightly between two supports. Pluck the string, the string begins to vibrate. Then we will be able to hear some sound, stop the movement of the string. Even the sound also stops. Why do I feel small vibrations in […]

What is a example of hardness? Hardness is a measure of how much a material resists changes in shape. Hard things resist pressure. Some examples of hard materials are diamond, boron carbide, quartz, tempered steel, ice, granite, concrete. Ability of material to resist wear, tear, scratching, abrasion cutting is called hardness. What is the difference […]

How can you tell if your well is low? The first sign is the water is sputtering out of the tap, indicating air pockets in the well. The second sign is the water is not clear, but muddy or filled with sediment. How long does well water take to refill? It’s difficult to give a […]

How many kW is a lift motor? Let’s say the machine lifts it up at a rate of 1 meter per second. So power needed would be 1000 x 1 = 1kW. But this is the power needed without frictional and other losses. Fairly assuming that the motor and pulley assembly is 80% efficient, actual […]

Is sleet or ice worse? 1. Freezing rain and sleet are a winter storm’s silent hazards. Ice in the form of freezing rain and sleet is just as big of a threat as snow, and often result in a winter weather advisory being issued for the affected region. Ice is arguably more dangerous than the […]

What is the angle of rotation of a circle? In mathematics, the angle of rotation is a measurement of the amount, of namely angle, that a figure is rotated about a fixed point, often the center of a circle. If a cart moves around the wheel once, the angle of rotation is 360°. What is […]

Can zinc be used to protect iron from rusting? Galvanising is a method of rust prevention. The iron or steel object is coated in a thin layer of zinc. This stops oxygen and water reaching the metal underneath – but the zinc also acts as a sacrificial metal . Zinc is more reactive than iron, […]

What is the resolving power of an electron microscope? Since the wavelength o f electrons are 100,000 times shorter than visible light the electron microscopes have greater resolving power. They can achieve a resolution of 0.2nm and magnifications upto 2,000,000 x. Light microscopes show limited resolution than electron microscopes. Which lens has the greatest resolving […]

What would happen if it rained forever? Floods would turn into mudslides which would turn into full landslides. This would compounded by the assumption that due to rain, little direct sunlight would come through, which would mean vegetation would start to die off. Many plants would die from being completely waterlogged. Is the whole world […]

Who uses 60Hz? Only a handful use 60Hz. The standard in the United States is 120V and 60Hz AC electricity….Listing per country. Country Voltage Frequency Austria 230V 50Hz Azerbaijan 220V 50Hz Azores 230V 50Hz Bahamas 120V 60Hz Why does Japan use 100v? The reason Japan became 100 volts was at the time Japan imported generators […]