Category: Physics

What are 3 interesting facts about platinum? Atomic number (number of protons in the nucleus): 78. Atomic symbol (on the periodic table of elements): Pt. Atomic weight (average mass of the atom): 195.1. Density: 12.4 ounces per cubic inch (21.45 grams per cubic cm) Phase at room temperature: solid. Melting point: 3,215.1 degrees Fahrenheit (1,768.4 […]

How much did a light bulb cost in 1879? How much did a light bulb cost in 1879? It had cost $40,000 (about $850,000 in today’s money) and taken 1,200 experiments, but was ready at last for a public debut. On New Year’s Eve, 3,000 people visited the lab in Menlo Park to witness 40 […]

Why is the membrane potential negative? The resting membrane potential is a result of different concentrations inside and outside the cell. The negative charge within the cell is created by the cell membrane being more permeable to potassium ion movement than sodium ion movement. What causes membrane potential? Sodium (Na+) and chloride (Cl−) ions are […]

How can soil biodiversity be improved? How Can Farmers Increase Soil Biodiversity? Employ sustainable grazing practices including use of “feral herbivores, over-abundant native herbivores and domestic stock,” (NSW Biodiversity Strategy). Limit tilling to avoid soil compaction and soil erosion. Use perennial plants alongside annual and biennial crops. How do farmers help biodiversity? Organic cropping systems […]

What is heat engine and heat pump difference between two? A refrigerator is a reversed heat engine, where heat is pumped from a body at low temperature to a body at high temperature. Any refrigerating system is a heat pump, which extracts heat from a cold body and delivers it to a hot body. A […]

Is a VVT engine good? There are many benefits to using VVT and virtually no drawbacks. One benefit is an increase in maximum engine speed (and therefore more peak power) – as much as a 25% increase. The exhaust gas recirculation reduces the amount of fuel needed to run the engine and therefore boosts the […]

How much lower was sea-level 10000 years ago? The last Ice Age As a consequence of global warming, albeit naturally, the rate of sea-level rise averaged ~1.2 cm per year for 10,000 years until it levelled off at roughly today’s position ~10,000 years ago. What was the world like 20000 years ago? 20,000 YEARS AGO. […]

What is the highest note a trumpet can play? In the most common case of a B♭-pitch trumpet, the highest note that can be played is said in elementary reference books to be one octave higher than the B♭ just above the middle line of the treble clef, but there are ways to produce even […]

What is the most important resource in the world? Data is now the most valuable resource in the world, beating out oil, according to The Economist. What are the three main resources? Classical economics recognizes three categories of resources, also referred to as factors of production: land, labor, and capital. Land includes all natural resources […]

Does running with a phone slow you down? It definitely can, but it isn’t the weight of the phone. What most people tend to do while running and carrying a phone (or anything else) is keep that hand still. If you aren’t using both of your arms equally, your running will be unbalanced which will […]