What China gave to the world? Papermaking, printing, gunpowder and the compass – the four great inventions of ancient China-are significant contributions of the Chinese nation to world civilization. China was the first nation to invent paper. What was invented 2000 years ago? Date Invention or discovery Prehistory 2000 BCE Water-raising and irrigation devices like […]
How can you tell if a plant is vascular or nonvascular?
How can you tell if a plant is vascular or nonvascular? Another difference is that a nonvascular plant doesn’t have roots like a vascular plant does. Instead, a nonvascular plant has rhizoids, small hairs that keep the plant in place. A vascular plant’s roots provide support and also soak up water from the area surrounding […]
Why do metal atoms lose electrons?
Why do metal atoms lose electrons? Metal atoms lose electrons to nonmetal atoms because metals typically have relatively low ionization energies. Metals at the bottom of a group lose electrons more easily than those at the top. How do metal atoms become stable? The reactions of elements are related to the number of electrons in […]
Why does force increase with increasing velocity in eccentric contractions?
Why does force increase with increasing velocity in eccentric contractions? During concentric muscle contraction, the force generated during shortening decreases non-linearly as the shortening velocity increases. Conversely, forced-lengthening of a contracting muscle (i.e. eccentric contraction) at loads that are greater than that of isometric contraction results in a rapid rise in force [1]. What happens […]
Why are custom neon signs so expensive?
Would is past or future?
What is the angle of reflected ray?
What is the angle of reflected ray? The law of reflection states that the angle of reflection equals the angle of incidence—θr = θi. The angles are measured relative to the perpendicular to the surface at the point where the ray strikes the surface. What is the purpose of angle of incidence? The angle of […]
Which chemical in our body are greatly affected by hormones?
Which chemical in our body are greatly affected by hormones? (ii) Pancreas secretes insulin and glucagon. These hormones control blood glucose level. Insulin decreases while glucagon increases blood glucose level. (iii) Adrenal medulla secretes adrenaline….More videos on YouTube. Gland/Organ Hormone Function (ii) Parathyroid Parathormone Regulates calcium metabolism. How do I keep my endocrine glands healthy? […]
Why is Delhi warmer than Singapore?
Why is Delhi warmer than Singapore? Singapore is in or near the tropical moist forest biome whereas New Delhi is in or near the tropical very dry forest biome. The average annual temperature is 1.6 °C (2.9°F) warmer. The altitude of the sun at midday is overall 13.3° higher in Singapore than in New Delhi. […]
What is rarefaction and compression?
What is rarefaction and compression? Compression and Rarefaction. • Compression- a region in a longitudinal (sound) wave where the particles are closest together. • Rarefaction- a region in a longitudinal (sound) wave where the particles are furthest apart. What is compression of a wave? A compression is a region in a longitudinal wave where the […]