Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Hi bobbym,

The solution #2374 is perfect. Brilliant!

#2375. A sum of $700 is to be used to give seven cash prizes to students of a school for their overall academic performance. If each prize is $20 less than the preceding prize, find the value of each of the prizes.

Hi bobbym,

the Answers : #5510 - Manfred Börner and #5511 - William Murdoch (sometimes spelled Murdock).

The Answer #5510 is correct. Marvelous!

#5512. Name the was a British inventor (13 April 1771 – 22 April 1833) and mining engineer from Cornwall, England. Born in the mining heartland of Cornwall, He was immersed in mining and engineering from an early age. The son of a mining captain, he performed poorly in school, but went on to be an early pioneer of steam-powered road and rail transport. His most significant contribution was the development of the first high-pressure steam engine. He also built the first full-scale working railway steam locomotive. On 21 February 1804 the world's first locomotive-hauled railway journey took place as his unnamed steam locomotive hauled a train along the tramway of the Penydarren Ironworks, in Merthyr Tydfil, Wales.

#5513. Name the German-Swiss chemist who is best known for inventing the fuel cell (1838) and his discoveries of guncotton and ozone (18 October 1799 – 29 August 1868). It was while doing experiments on the electrolysis of water at the University of Basel that he first began to notice a distinctive odor in his laboratory. This smell gave him the clue to the presence of a new product from his experiments. Because of the pronounced smell, he coined the term "ozone" for the new gas, from the Greek word "ozein", meaning "to smell".

Hi bobbym,

The solution #2373 is correct. Good work!

#2374. The sum of the 4th and 8th term of an Arithmetic Progression is 24 and the sum of the 6th and 10th term is 44. Find the first three terms of the Arithmetic Progression.

H bobbym,

The Answer #5509 is correct. Marvelous!

#5510. Name the German physicist (born 16 March 1929 in Rochlitz; died 15 January 1996 in Ulm) who developed the first working fiber-optical data transmission system in 1965. He received a patent for an "electro-optical transmission system utilizing lasers". From 1954 to 1979 he worked for the german Telefunken GmbH. Later, from 1979 to 1995, he was professor at the Technical University Munich. In 1982, he was awarded 'Fellow of the Institute of Electrical and Electronics Engineers (IEEE)'.

#5511. Name the Scottish engineer and long-term inventor (21 August 1754 – 15 November 1839) . He was employed by the firm of Boulton and Watt and worked for them in Cornwall, as a steam engine erector for ten years, spending most of the rest of his life in Birmingham, England. He was the inventor of the oscillating cylinder steam engine, and gas lighting is attributed to him in the early 1790s, also the term "gasometer". However, Archibald Cochrane, ninth Earl of Dundonald, had already in 1789 used gas for lighting his family estate.

Hi bobbym,

The solution #2372 is perfect. Excellent!

#2373. Which term of the Arithmetic Progression 5, 15, 25, .... will be 130 more than its 31st term?

Hi bobbym,

#5508. Name the Italian maker of musical instruments (May 4, 1655 – January 27, 1731), generally regarded as the inventor of the piano.

#5509. Johannes Gutenberg was a German blacksmith, goldsmith, printer, and publisher who introduced printing to Europe. His invention of mechanical movable type printing started the Printing Revolution and is widely regarded as the most important event of the modern period. It played a key role in the development of the Renaissance, Reformation, the Age of Enlightenment, and the Scientific revolution and laid the material basis for the modern knowledge-based economy and the spread of learning to the masses. In which year did he invent the printing press, the first European to use movable type printing?

Hi bobbym,

and are both correct. Marvelous!

#5506. Name the instrument / gadget : A type of non-magnetic compass which is based on a fast-spinning disc and rotation of the Earth (or another planetary body if used elsewhere in the universe) to automatically find geographical direction.

#5507. Name the inventor : The electric-powered washing machine, invented in 1908, was a great time- and sweat-saving device—but only for those who could afford it and had regular electricity. He noticed that many in his Fort Worth community didn’t fit that description. In 1934, he purchased four electric washing machines and installed them in the same building. He charged people by the hour to clean their clothes in his “washateria,” now better known as a laundromat.

Hi bobbym,

The Answer #686 (Angioma) is correct! Excellent!

#687. Name the medical term / phrase : (abbreviated MG) It is either an autoimmune or congenital neuromuscular disease that leads to fluctuating muscle weakness and fatigue. In the most common cases, muscle weakness is caused by circulating antibodies that block acetylcholine receptors at the postsynaptic neuromuscular junction, inhibiting the excitatory effects of the neurotransmitter acetylcholine on nicotinic receptors at neuromuscular junctions. Alternatively, in a much rarer form, muscle weakness is caused by a genetic defect in some portion of the neuromuscular junction, that is inherited at birth as opposed to developing it through autoimmunity later in life or through passive transmission by the mother's immune system at birth.

Hi bobbym,

The Answer #1834 is correct. Excellent, bobbym!

#1835. What does the adjective *therapeutic* mean?

#1836. What does the adjective *thespian* mean?

Hi bobbym,

The Answers #5502 (James Hargreaves) and #5503 (Moog synthesizer) are correct! Magnificent!

#5504. Name the French chemist (September 28, 1852 – February 20, 1907) who won the 1906 Nobel Prize in Chemistry for his work in isolating fluorine from its compounds. He was one of the original members of the International Atomic Weights Committee.

#5505. Sir Isaac Newton's *Philosophiæ Naturalis Principia Mathematica*, known as the *Principia*, is published by the Royal Society of London. In it, Newton describes his theory of universal gravitation, explains the laws of mechanics and gives a formula for the speed of sound. The writing of*Principia Mathematica* ushers in a tidal wave of changes in thought, significantly accelerating the scientific revolution by providing new and practical intellectual tools and becomes the foundation of modern physics. In which year was it published?

Hi David and bobbym,

The Answer #685 (cochlea) is correct. Good work, David and bobbym!

#686. Name the medical term : Benign tumors derived from cells of the vascular or lymphatic vessel walls (endothelium) or derived from cells of the tissues surrounding these vessels. They are a frequent occurrence as patients age, but they might be an indicator of systemic problems such as liver disease. They are not commonly associated with malignancy. They usually appear at or near the surface of the skin anywhere on the body, and may be considered bothersome depending on their location. However, they may be present as symptoms of another more serious disorder, such as cirrhosis. When they are removed, it is generally for cosmetic reasons.

Hi bobbym,

Both the Answers, #1831 and #1832, are correct. Excellent!

#1833. What does the noun *thane* mean?

#1834. What does the noun *thaumaturge* mean?

Hi bobbym,

and .

The Answer #5501 is correct. Marvelous!

#5502. Who invented the spinning jenny, a multi-spindle spinning frame, and was one of the key developments in the industrialization of weaving during the early Industrial Revolution, in 1764, England?

#5503. What invention was Robert Arthur Moog (May 23, 1934 – August 21, 2005), was an American pioneer of electronic music, known for?

Hi bobbym,

Good work!

#2372. The first term of an Arithmetic Progression is 5, the last term is 45, and the sum of terms is 400. Find the number of terms.

Hi bobbym,

#5433. Find the discriminant of the quadratic equation

.Hi bobbym,

The solution #5431 is correct. Exemplary!

#5432. Seven years ago, Varun's age was five times the square of Swati's age. Three years hence, Swati's age will be two-fifth of Varun's age. Find their present ages.

Hi bobbym,

The solution #2370 is correct. Brilliant!

#2371. How many terms of the series 54, 51, 48... be taken so that, their sum is 513?

Hi bobbym,

#685. Name the auditory portion of the inner ear. It is a spiral-shaped cavity in the bony labyrinth, in humans making 2.5 turns around its axis, the modiolus. A core component of it is the Organ of Corti, the sensory organ of hearing, which is distributed along the partition separating fluid chambers in the coiled tapered tube of it.

Hi bobbym,

#684. Name the medical term / phrase : (Also known as occipitofrontalis muscle) : A muscle which covers parts of the skull. It consists of two parts or bellies: The occipital belly, near the occipital bone, and the frontal belly, near the frontal bone. In humans, it only serves for facial expressions. The occipitofrontalis muscle receives blood from several arteries. The frontal belly receives blood from the supraorbital and supratrochlear arteries, while the occipital belly receives blood from the occipital artery. The occipitofrontalis muscle is innervated by the facial nerve.

Hi bobbym,

.

#2370. How many terms of the Arithmetic Progression : 9, 17, 25, ... must be taken to give a sum of 636?

Hi bobbym,

The solution #5430 is correct. Wonderful!

#5431. The sum of the reciprocals of a person's age (in years) 3 years ago and 5 years from now is

. Find the person's present age.Hi bobbym,

The solution #2368 is correct. Neat work!

#2369. Find the 20th term from the last term of the Arithmetic Progression 3, 8, 13, ....., 253.

Hi bobbym,

The solution #5429 is correct. Neat work!

#5430. Solve the quadratic equation

for x.Hi bobbym,

The solution(s) #2367 is / are correct! Neat work!

#2368. For what values of p are 2p + 1, 13, 5p - 3 three consecutive terms of an Arithmetic Progression?

Hi bobbym,

The solution #2366 is correct. Good work!

#2367. If Q (0,1) is equidistant from P (5,-3) and R (x,6), find the value of 'x'.