Science

Refine Search

What are a few scientific forces?

Contact forces result from two objects coming into contact with one another. In the case of friction, this force occurs when one item drags or rubs against another item. Examples of friction include brake pads on a vehicle and air resistance. A normal force is an upward force exerted on an object that is equal to the weight of the object and helps balance the object. For example, if a person is standing the floor, the floor exerts a normal force upward onto the person equal to his weight. When a string, cable or wire pulled taught transmits a force, it's called "tension." Applied force oc..

Continue Reading

How many people work at NASA?

In 1957, The Space Age began when the Soviet Union launched their satellite, called Sputnik, into orbit. Thus began what the world now knows as "The Space Race". NASA was created in Washington, D.C., in 1958. The agency specializes in aeronautic research and space travel and exploration. NASA's responsibilities include, but are not limited to, sending America's astronauts into space, launching satellites into orbit, and launching space probes into the solar system.

Continue Reading

Is there a net gain of ATP in glycolysis?

The purpose of glycolysis is the production of energy inside cells. Glycolysis is just one of the methods used by cells in this regard, with many products - such as molecules of pyruvic acid - entering more complex cycles, such as Kreb's cycle, in the production of yet more ATP. This ATP is a necessary part of the diet of cells, assisting them in avoiding the build up of toxic waste products.

Continue Reading

How do you convert 2pm GMT to EST?

Take note of the time given in GMTWrite down your time as given in GMT. You want to convert 2 p.m. GMT.Subtract the appropriate amount of hours from GMTYou want to convert 2 p.m. GMT to EST so you need to subtract 5 hours from 2 p.m. GMT. If you wanted to convert to EDT (generally in effect in the US from March until November), you would only subtract 4 hours from 2 p.m. GMT.Record your time in ESTWhen you subtract 5 hours from 2 p.m. GMT, you arrive at 9 a.m. EST.

Continue Reading

What causes the noise when you crack or pop a joint?

When joints lose smooth cartilage, as occurs in people with osteoarthritis, the joints make sounds as they move because of the roughness, explains the Library of Congress. As people move their joints, the corresponding tendons change their positions, moving out of place. When a tendon returns to its original position, it often produces a snapping sound. People moving their joints may also feel their ligaments tightening, especially in the ankles and knees. The tightening often creates a cracking sound.\nPeople who experience pain when their joints pop should consult physicians, notes the Libra..

Continue Reading

Are blue moons actually blue?

Blue moons, though not actually blue in color, are somewhat rare. The lunar cycle takes about 29 days to complete, which is shorter than the average earth month, and there are usually just 12 full moons every year. However, every 2 or 3 years, there will be a month that has two full moons, the second of which is known as the blue moon. People have been using the term "blue moon" to describe strange or rare occurrences since the 1820s.

Continue Reading

How do birds protect themselves?

To protect themselves from cold, many birds consume large amounts of food. However, eating puts them in a stationary position in which they are vulnerable to predators, so they frequently scan their environment as they eat. During the winter months, birds instinctively regulate their intake to maintain a body mass that protects them from the cold while still allowing them to escape quickly when danger appears.\nAnother way birds protect themselves is to fluff up their feathers to stay warm. Birds of the order Passeriformes, which make up over half of all bird species, have downy coats that tra..

Continue Reading

How do you balance Pb(NO3)2(aq) + HCl(aq)?

Break down the equation into all its partsStart by reducing molecules into their ionic parts, as all of these substances form ions in water. Lead, or Pb, has a plus-two charge. Two moles of nitrate, or NO3, have a negative one charge. Two moles of hydrogen, or H, have a plus one charge. Two moles of chloride, or Cl, have a negative one charge.Cancel out ions that do not participateTwo ions do not participate in the reaction, so cancel them out of the overall equation. Hydrogen and nitrate remain in their ionic states from the reactants to the products. That leaves one mole of lead and two mole..

Continue Reading

What is a squirrel's gestation period?

Fox squirrels and Eastern grey squirrels have two litters a year with their young being born between February and April for the first litter and between August and September for the second. Western grey squirrels have one litter a year, typically with their young being born between February and June. Baby squirrels are born without hair and are mostly helpless for the first months of their lives. A squirrel's nest, typically built of twigs, is called a drey.

Continue Reading

What is Seliwanoff's test?

In Selwanoff's test, ketone hexoses, which are carbohydrates with six carbons, will turn a deep red when they react with the reagent. An aldehyde hexose will turn a light pink when it reacts with the reagent. Ketone hexoses will form a color much more rapidly than the aldehyde hexoses.To perform the test, chemists add about 2 milliliters to test tubes containing 10 drops of the sugar being tested. The test tubes are then heated in boiling water. After about 1 minute, the deep red will appear if a ketone hexose is present.

Continue Reading
Showing 1951 to 1960 of 10000 (1000 Pages)