Hao

Most popular questions and responses by Hao
  1. I NEED HELP PLEASE

    A trough is 8 meters long, 3 meters wide, and 5 meters deep. The vertical cross-section of the trough parallel to an end is shaped like an isoceles triangle (with height 5 meters, and base, on top, of length 3 meters). The trough is full of water (density

    asked on March 19, 2014
  2. Math

    A trough is 8 meters long, 3 meters wide, and 5 meters deep. The vertical cross-section of the trough parallel to an end is shaped like an isoceles triangle (with height 5 meters, and base, on top, of length 3 meters). The trough is full of water (density

    asked on March 18, 2014
  3. chemistry

    In hydrated copper sulfate, the chemical formula is CuSO4.5H2O, while that of hydrated cobalt(II) chloride is CoCl2.6H2O. I want to ask how to determine the number of moles of water is needed to hydrate any salt. Is there a pattern or formula?

    asked on November 8, 2013
  4. Thermodynamics

    A 10m height cylinder with cross sectional area of 0.1 m2 has a massless piston at the bottom as shown in Figure Q2. Water is at the top of the piston with air at 20oC over it. Under the piston there is air at 300K. The volume of the air is 0.3m3. Heat is

    asked on April 14, 2014
  5. Physics

    If the work required to stretch a spring 4 feet beyond its natural length is 17 foot-pounds, how much work is needed to stretch it 14 inches beyond its natural length? Your answer must include the correct units. (You may enter lbf or lb*ft for ft-lb.)

    asked on March 18, 2014
  6. Chemistry

    Is boron trichloride a Giant covalent or Simple molecular substance?

    asked on October 14, 2013
  7. Thermodynamics

    A 10m height cylinder with cross sectional area of 0.1 m2 has a massless piston at the bottom as shown in Figure Q2. Water is at the top of the piston with air at 20oC over it. Under the piston there is air at 300K. The volume of the air is 0.3m3. Heat is

    asked on April 14, 2014
  8. math

    It is known that the number of people who enter a bank during a time interval of t minutes is a Poisson random variable with the parameter t. The bank opens at 8am and you arrive at the bank at uniformly random time between 8am and 9am. Let X be the

    asked on May 3, 2013
  9. Chemistry

    Which of the following is not suitable for testing the presence of an acid? A) adding aqueous potassium carbonate. B) adding aqueous potassium hydroxide. C) adding Universal Indicator. D) adding zinc powder. Personally, I feel that all of them are

    asked on October 13, 2013
  10. science

    To have a high work effiency of concrete batching plant,we need to know the maintance of it to extend its useful life.We have study this for a long time and it includes two aspects. One is lubricating the shaft of concrete batching plant when it works

    asked on June 26, 2014
  11. Math

    Water is flowing into a trough at a rate of 100 cubic centimeters per second. The trough has a length of 3 meters and cross sections in the form of a trapezoid, whose height is 50 cm, whose lower base is 25 cm and whose upper base is 1 meter. At what rate

    asked on May 12, 2014
  12. maths

    what is 454456x45647+344554564-44453287= with out using a Calculator

    asked on May 14, 2015
  13. maths

    what is 453776578665432 x 3467+3244325-34677797= [with out using a Calculator.

    asked on May 14, 2015
  14. math

    what is 1255 to the nearest 3000

    asked on May 14, 2015
  15. chemistry

    What is formed when zinc carbonate reacts with concentrated hydrochloric acid?

    asked on November 14, 2013
  16. chemistry

    How to perform an experiment to distinguish between zinc(II) hydroxide and magnesium hydroxide?

    asked on November 8, 2013
  1. literature

    to find the message

    posted on April 6, 2019
  2. I NEED HELP PLEASE

    I keep getting 122500 as an answer and my online homework keeps saying that it's wrong. I've tried other ways but it's still incorrect

    posted on March 19, 2014