Category: Physics

What is the physical and chemical properties of matter? A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific […]

How long can blood sit out after being spun? Whole blood samples should not remain at room temperature longer than 8 hours. If assays are not completed within 8 hours, samples should be stored at +2°C to +8°C no longer than 7 days. If assays are not completed within 7 days, or the sample is […]

How do skaters not get dizzy? When our head rotation triggers this automatic, repetitive eye movement, called nystagmus, we get dizzy. Skaters suppress the dizziness by learning how to counteract nystagmus with another type of eye movement, called optokinetic nystagmus. Why is backflip banned in skating? Even though the move that caused the leak was […]

Does a gear with more teeth spin faster? Increase speed: If you connect two gears together and the first one has more teeth than the second one (generally that means it’s a bigger-sized wheel), the second one has to turn round much faster to keep up. So this arrangement means the second wheel turns faster […]

What does 8 mean in the periodic table? Oxygen What are the 30 elements and their symbols? The first 30 elements of the periodic table and their symbols A B Helium He Lithium Li Beryllium Be Boron B What is the 30 elements? The Elements, sorted by Atomic Number Atomic Number Symbol Name 30 Zn […]

Is Bottled Water Safe After being in the heat? Some scientists who study the durability of food containers recommend against drinking water from plastic bottles left in a hot place for a long time concerned that the sizzling heat could allow chemicals to leach into the water. … How long can you keep water in […]

What are examples of analogous structures? But they look similar and serve a similar purpose. For example, the wings of an insect, bird, and bat would all be analogous structures: they all evolved to allow flight, but they did not evolve at the same time, since insects, birds, and mammals all evolved the ability to […]

What is the density of Earth in kg m3? 5515 kg.m−3 What is the density of steel and concrete? Steel is about 3.25 times as dense as plain concrete, so if 1% by volume is rebar replacing concrete density increases 2.25%. What is the density of black sand? around 5g/cm3 What is the density of […]

Why is the anode positive? In an electrolytic cell(one used for electrolysis), the anode is positively charged. This is because the electrode connected to the positive terminal of the battery is where the negatively charged ions go to lose electrons, that is, to get oxidized. Why is anode positive and anion negative? The battery pumps […]

What is the medical term for the graphic record of the electrical impulses of the heart? ECG/EKG. The graphic record of the electrical current as it progresses through the heart. How is bipolar recording done? Bipolar electrodes are fabricated by hot-pressing the graphite felt sheets onto both sides of the conducting plastic substrates so that […]