stefan

Newest questions and responses by stefan
  1. geography

    why is Israel the only country in the region that qualifies as a developed nation?

    asked on September 22, 2017
  2. History

    What are the main factors that have affected the economic development in the Middle East? Explain the economic stagnation in the region.

    asked on September 22, 2017
  3. math

    Skip is practicing tennis serves against a wall. The distance between Skip and the tennis ball, in feet, at any time T, measured in seconds, is D(T)=-1.5|T-8|+9. which analysis of the formula is true? A. Skip is 9 feet from the wall and the ball will

    asked on May 30, 2016
  4. History

    I've been looking for the answers to questions on my study guide for a test I will have for a couple hours and I got a lot of them. However, there are some that I still have a hard time finding. Here are the questions. If I can be told even some of these,

    asked on March 20, 2016
  5. maths

    out of 10 litre a milkman sells some milk at the rate of Rs 15 perlitre and some at the rate of 12 per litre . He gets Rs 141 on selling it. Find the quantity of milk he sold at each rate.

    asked on January 25, 2016
  6. maths

    suresh scored 15 mareks more than ramesh in maths.if the sum of their marks in maths is 275.write the statement in linear equation in two variables

    asked on January 25, 2016
  7. maths

    QR is parallel to ST and PQ:QR = 2:1. Given the area of triangle PST is 18cm2, the area of triangle PQR in sq cm is?

    asked on July 8, 2014
  8. Chemistry (My previous post lacked something)

    Question: At STP propane (C3H8) burns in oxygen to form 2.15L of carbon dioxide and water. The question is in 4 parts. I just need the first: a)What mass of oxygen is necessary for this reaction? So far I've got 2.15 L x 1 mole /22.4 L But when I try to do

    asked on January 15, 2014
  9. Chemistry

    So I have the balanced equation: c3H8 +502 = 3C02 +4H20 Question: At STP propane (C3H8) burns in oxygen to form 2.15L of carbon dioxide and water. So I've got 2.15 L x 1 mole /22.4 L But when I try to do the mole ratio, I don't know what to do since the

    asked on January 15, 2014
  10. Science

    a sample of an unknown metal has a mass of 21.6g and a volume of 8.00cm^3 . calculate the density of the unknown metal

    asked on February 23, 2013
  11. math

    come si fanno le frazioni di un numero

    asked on November 2, 2011
  12. Physics

    Microwaves of wavelength 4.50 cm enter a long, narrow window in a building that is otherwise essentially opaque to the incoming waves. If the window is 36.5 cm wide, what is the distance from the central maximum to the first-order minimum along a wall 6.70

    asked on April 14, 2011
  13. Physics

    A 2.40 m length of wire is held in an east-west direction and moves horizontally to the north with a speed of 15.1 m/s. The vertical component of Earth's magnetic field in this region is 40.0 ┬ÁT directed downward. Calculate the induced emf between the

    asked on March 21, 2011
  14. Physics

    An eight turn coil encloses an elliptical area having a major axis of 40.0 cm and a minor axis of 30.0 cm. The coil lies in the plane of the screen and has a 6.10 A current flowing clockwise around it. If the coil is in a uniform magnetic field of 2.07

    asked on March 10, 2011
  15. Physics

    An eight turn coil encloses an elliptical area having a major axis of 40.0 cm and a minor axis of 30.0 cm. The coil lies in the plane of the screen and has a 6.10 A current flowing clockwise around it. If the coil is in a uniform magnetic field of 2.07

    asked on March 10, 2011
  16. College Physics

    A charge of -3.10 nC and a charge of -6.65 nC are separated by a distance of 80.0 cm. Find the position at which a third charge of +7.10 nC can be placed so that the net electrostatic force on it is zero.

    asked on January 20, 2011
  17. College Physics

    A charge of -3.10 nC and a charge of -6.65 nC are separated by a distance of 80.0 cm. Find the position at which a third charge of +7.10 nC can be placed so that the net electrostatic force on it is zero.

    asked on January 20, 2011
  18. Physics

    A nuclear power plant has an electrical power output of 1200 MW and operates with an efficiency of 31%. If excess energy is carried away from the plant by a river with a flow rate of 1.0 x 10^6 kg/s, what is the rise in temperature of the flowing water?

    asked on December 4, 2010
  19. Physics

    In one cycle a heat engine absorbs 530 J from a high-temperature reservoir and expels 310 J to a low-temperature reservoir. If the efficiency of this engine is 55% of the efficiency of a Carnot engine, what is the ratio of the low temperature to the high

    asked on December 4, 2010
  20. question...biographies

    Which is the MOST important literary element in biographies? A.Plots B.Characters C.Settings D.Point of view I believe is characters...but I just want to make sure with some one.

    asked on December 11, 2008
  1. 10th

    the glass stirring rob submerge the copper coil into the silver nitrate AgNO3

    posted on January 5, 2018
  2. help with one question please!!

    Thanks Damon as always.

    posted on December 13, 2017
  3. chemistry

    42... It's always 42

    posted on March 31, 2016
  4. History

    These questions didn't come from the the text. The teacher was saying them out loud and we were supposed to write them down. He got them from our test. I'm confused with the third question too, my step dad said the same thing. I think I found the answers

    posted on March 21, 2016
  5. maths

    ans x=130 and y=145 is it right pls help me

    posted on January 25, 2016
  6. maths

    i don't know pls help me

    posted on January 25, 2016
  7. maths

    15x + y = 0 ---------- 1 x1 x + y = 275 -------- 2 x15 15x + y = 0 15x +15y = 4125 - - - ---------------------- 0 -14y = -4125 y = -4125 -14

    posted on January 25, 2016
  8. maths

    15x + y = 0 x + y = 275

    posted on January 25, 2016
  9. maths

    PQR is an interior triangle within triangle PST. QR runs parallel to ST.

    posted on July 9, 2014
  10. Physics

    Thanks for your help! I got the correct answer

    posted on December 5, 2010
  11. Physics

    By taking 3.87E9/4.18 then dividing it by the flow rate of the water (1.0E6 kg/s = 1.0E9 g/s)

    posted on December 5, 2010
  12. Physics

    Thanks for your help. For the answer I got it to be 0.925837321 by following your directions. When I submitted it to my online homework it said the answer was wrong and off by more than 10%.

    posted on December 5, 2010
  13. math

    655555

    posted on June 17, 2008