Category: Physics

What type of radiation is harmful? Gamma rays Which is the most Ionising radiation? Alpha What is a everyday example of radiation? Some common examples of Radiation are Ultraviolet light from the sun, heat from a stove burner, visible light from a candle, x-rays from an x-ray machine. All life on Earth depends on the […]

What are the three main rock types? There are three kinds of rock: igneous, sedimentary, and metamorphic. Igneous rocks form when molten rock (magma or lava) cools and solidifies. Sedimentary rocks originate when particles settle out of water or air, or by precipitation of minerals from water. How do I identify rocks and minerals? To […]

How long do wheel hub bearings last? 136,000 to 160,000 km Do I need to replace the hub assembly or just the bearing? A major difference between the two is how they are assembled. Wheel bearings can be taken apart, lubricated and reassembled to be used again. Hub bearings are pre-packed at the manufacturer’s factory […]

What are the 5 properties of light? The primary properties of visible light are intensity, propagation-direction, frequency or wavelength spectrum and polarization, while its speed in a vacuum, 299 792 458 m/s, is one of the fundamental constants of nature. What are the 5 properties of light grade 4? Light & Sound Light & Sound […]

How do you calculate the energy content of fuel? where H = heat energy absorbed (in J), ∆t = change in temperature (in °C), m = mass (in g), and Cp = specific heat capacity (4.18 J/g°C for water). Dividing the resulting energy value by grams of food burned gives the energy content (in J/g). […]

Do all flowers contain both male and female parts? Flowers can have either all male parts, all female parts, or a combination. Flowers with all male or all female parts are called imperfect (cucumbers, pumpkin and melons). Flowers that have both male and female parts are called perfect (roses, lilies, dandelion). What do you call […]

Why is productivity important? Productivity is a measure of the efficiency of production. High productivity can lead to greater profits for businesses and greater income for individuals. For businesses, productivity growth is important because providing more goods and services to consumers translates to higher profits. Why efficiency is so important? Efficiency reduces hunger and malnutrition […]

Can a matrix have nullity 0? As to why a matrix is invertible if is has zero nullity, this comes back to what it means for a matrix (or more specifically a linear map) to be invertible. It means that you can reverse its effects. If a matrix has nullity above 0, that means there […]

What is used to measure longer length? Centimeters and millimeters help measure smaller lengths and meters and kilometers help measure larger lengths like distance. For example, the length of the pencils can be calculated in centimeters (cm), while kilometers can measure the distance between two buildings or places. What do you need to know in […]

Why cognitive dissonance is bad? Cognitive dissonance can even influence how people feel about and view themselves, leading to negative feelings of self-esteem and self-worth. Because people want to avoid this discomfort, cognitive dissonance can have a wide range of effects. Dissonance can play a role in how people act, think, and make decisions. What […]