The insecticide DDT has a half-life in the human body of approximately 7 years. That is, in 7 years its concentration. Although DDT is no longer in…

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The insecticide DDT has a half-life in the human body of approximately 7 years. That is, in 7 years its concentration. Although DDT is no longer in use in the United States. It was estimated that 25 years ago the average farm worker had a body DDT concentration of 22 ppm (parts per million by weight). Estimate what the farm worker’s present concentration would be.

As a spacecraft approaches a planet, the rocket engines on it are fired (turned on) to slow it down so it will go into orbit around the planet.

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As a spacecraft approaches a planet, the rocket engines on it are fired (turned on) to slow it down so it will go into orbit around the planet. The spacecraft’s mass is 2,475 kg and the thrust (force) of the rocket engines is 405 N. If its speed must be decreased by 1,234 m/s, how long (in minutes) must the engines be fired? (Ignore the change in the mass as the fuel is burned.)

Please explain how you got this answer as I really want to understand it.

What is the significance development of IOM(institute of medicine) report in nursing what is the relevance of IOM, in caring for diverse population

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What is the significance development of IOM(institute of medicine) report in nursing

what is the relevance of IOM, in caring for diverse population across the life span and within the health illness continuum.

Sam, whose mass is 71 kg, takes off accross level snow in his jet powered skis. The skis have a thrust of 197 N and a coefficient of kinetic friction…

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Sam, whose mass is 71 kg, takes off accross level snow in his jet powered skis. The skis have a thrust of 197 N and a coefficient of kinetic friction on snow of 0.1. Unfortunatately, the skis run out of fuel after only 10s. (a) What is Sam’s top speed?(b) How far has Sam traveled when he finally coasts to a stop?

Question 11 Match each description with its correct term.

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Question 11

Match each description with its correct term.

         –

           A.

           B.

           C.

           D.

           E.

The greatest amount of material transported by a stream is carried in this

         –

           A.

           B.

           C.

           D.

           E.

The landform that results when a meandering stream is incised into a gradually rising crust or bedrock

         –

           A.

           B.

           C.

           D.

           E.

The direct collision of a raindrop with the ground, laterally shifting fine particles a few millimeters

         –

           A.

           B.

           C.

           D.

           E.

It develops along a streambed containing bedrock of differential resistance

         –

           A.

           B.

           C.

           D.

           E.

Process whereby the gentle slope of an interfluve changes to the steeper slope of a valley side.

A.Splash erosion

B.Entrenched meander

C.Knickpoint

D.Suspended load

E.Headward erosion

Which statement is true for the cell as it discharges?

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Which statement is true for the cell as it discharges?Zn | Zn2+(1 .0 M) || Sn2+(1.0 M) | Sn(A) Oxidation occurs at the tin electrode.(B) Electrons will flow from the tin electrode to the zinc electrode.(C) The concentration of Zn2+ will increase.(D) The mass of the tin electrode will decrease.

A dissolve 8g of Ammonium iron (II)sulfate in 25cm3 of water that has been acidified with 1cm3 of 2M sylfuric acid.Add solution of oxalic acid (5g in…

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A dissolve 8g of Ammonium iron (II)sulfate in 25cm3 of water that has been acidified with 1cm3 of 2M sylfuric acid.Add solution of oxalic acid (5g in 30cm3 water) and boil.Filter the yellow prepitate in a buchner funnel and was well with hot water.a. wite the complete balanced equation of the the products obtainedb. calculate the yield percentagec. Describe the coordination of the ligands onto the metal centres in terms of the crystal field theoryand determine the structure from its hybridisationd. draw the full structure of the complesxese. sate the errors involved in the compexes

A car traveling at 88 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.

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A car traveling at 88 km/h strikes a tree. The front end of the car compresses and the driver comes to rest after traveling 0.79 m. What was the average acceleration of the driver during the collision? Express the answer in terms of “g’s,” where 1.00g = 9.80 m/s2

A Hall-effect probe operates with a 121 mA current. When the probe is placed in a uniform magnetic field with a magnitude of 0.0758 T, it produces a…

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A Hall-effect probe operates with a 121 mA current. When the probe is placed in a uniform magnetic field with a magnitude of 0.0758 T, it produces a Hall voltage of 0.691 µV. When it is measuring an unknown magnetic field, the Hall voltage is 0.337 µV. What is the unknown magnitude of the field? B.If the thickness of the probe in the direction of B is 1.88 mm, calculate the charge-carrier density (each of charge e).?