Total # Posts: 273
A is a solution of hydrochloric acid containing 3.650g of HCl in 1dm3 of solution. B is a solution of impure sodium carbonate. 25cm3 of B require 22.7cm3 of A for complete reaction. Given that 5.00g of impure B was dissolved in1dm3 solution,what is the percentage by mass pf ...
February 23, 2017
The shipping clerk packs a cube with side lengths of 8 inches into a box with side lengths of 10 inches. What is the volume of the space left in the larger box for packing materials?
February 15, 2017
The north wall of a barn is a rectangle 25 feet high and 60 feet long. There are five windows in the wall, each 8 by 10 feet. If a gallon of paint will cover 275 ft2, how many gallons of paint must the painter buy to paint the wall?
February 1, 2017
P,Q and R are points on the same horizontal plane .the bearing of Q from P is 150° and the bearing of R from Q is 060°. if |PQ| =5m and |QR|=3m find the bearing of R from P correct your answer to the nearest degree
January 9, 2017
A minimum energy of 151 kJ is required to dissociate a mole of iodine molecules, I2. Calculate the wavelength of radiation that supplies this energy, assuming each bond beaks by absorbing one photon.
November 28, 2016
Every Wednesday is salad bar day at Ashley's school. The most popular ingredients are cherry tomatoes, cucumber slices, and shredded carrot. Last Wednesday, out of the 27 students in Ashley's class- 14 took carrot 13 took cucumber 16 took tomato 8 took cucumber and ...
October 26, 2016
An unknown substance at a temperature of 20 degrees Celsius is warmed up to 50 degrees when water at 80 degrees is added to it. Can I post this question. There is more information I have and the point is to find the specific heat of the unknown substance.
October 11, 2016
A signal lac has six flags of which 1is blue ,two z white,3 ar red.it sends messages hostin flags in a flagpole.d messages ar being conveyed by d order in which d colours ar arranged find hw many mesaages it can send.......a.using exactly six flags,b.using exactly five flags
August 31, 2016
A 900-kg merry-go-round (a flat, solid cylinder) supports 10 children, each with a mass of 50.0 kg, located at the axis of rotation (thus you may assume the children have no angular momentum at that location). You need to describe a plan to move the children such that the ...
April 22, 2016
A truck is moving away at 30 mph from a car moving towards the truck at 60 mph. If the truck emits a horn of frequency 500 Hz, what frequency does the driver of the car hear to 3 significant digits? how do i solve i know the answer is 519hz but how?
February 23, 2016
A sector of a circle of radius 7cm subtending an angle of 270 degree at centre of the circle is use to form a cone? (A)find the base radius of the cone. (B)calculate the area of the base of the cone.
February 2, 2016
a) Co(H2O)6^2 + 4 Cl^‐1 (aq) ⇄ CoCl4^‐2 (aq) + 6 H2O (l) Rewrite the net ionic equation above including the energy term where appropriate. The Delta H for this reaction is +50 kJ/mol. b) Silver chloride (AgCl) is a white solid. For the equilibrium reaction ...
October 4, 2015
Melissa wants to figure out how many fish live in a small lake by her house .She ccatces 15 fish and tags the (safely).Shethen outs thoes fish back in the lake .Then next day ,she catches 28 fish .of those 28 fish, 3 of them have the tags on them.About how many total fish live...
August 22, 2015
The brass bar and the aluminum bar in the drawing are each attached to an immovable wall. At 21.3 °C the air gap between the rods is 1.70 x 10-3 m. At what temperature will the gap be closed?
August 16, 2015
A person who weighs 717 N is riding a 80-N mountain bike. Suppose the entire weight of the rider plus bike is supported equally by the two tires. If the gauge pressure in each tire is 8.10 x 105 Pa, what is the area of contact between each tire and the ground?
August 16, 2015
The Eiffel Tower is a steel structure whose height increases by 19.0 cm when the temperature changes from -9 to +41 oC. What is the approximate height (in meters) at the lower temperature?
August 16, 2015
basic programming principles
2.Write only the select case statements for the following problem statement. The marital code of a person is stored in the variable called marCode. Display the corresponding description on the screen. Provide for an incorrect marital code Marital Code S Single D Divorced M ...
March 31, 2015
At the library, the quickest way to locate varied, reliable information for your research paper is to A. check the encyclopedias. B. search the card catalog for related titles. C. ask the reference librarian. D. check the Readers' Guide.
January 21, 2015
The Electoral College was included in the Constitution primarily because the Framers believed that __________. political parties might be regulated by the government the general public might be swayed by a charismatic leader cooperation between the executive and legislative ...
November 25, 2014
Jennifer owes $13,000 to a friend who is charging her interest of 0.90% p.m. She is required to settle the amount owed with two equal payments, one today and the other in three months. Calculate the size of the payments using three months as the focal date. I am totally lost...
October 30, 2014
A mass is thrown upward towards a vertical wall. If the release point is at a horizontal distance of 12 meters from the base of the wall, and the ball is launched at an angle of 60 degrees above the horizontal, with what speed need it be thrown so that it strikes the wall 10 ...
September 21, 2014
A cooling cost 1540 dollars. After four years he sold at half their value. If this is repeated every four years, the payment in the refrigerator the fifth person to buy it and after a few years this purchase was made.
June 10, 2014
It the specific gravity of mercury is 13.6 and the atmospheric pressure is 70cm of mercury, what is the total pressure of the gas supply in cm of water if the height of water is increase by 3cm?
May 13, 2014
If $12,000 is invested in a certain business at the start of the year, the investor will receive $3,600 at the end of the next four years. What is the present value of this business opportunity if the interest rate is 7% per year?
March 29, 2014
A college professor contributes $5,000 per year into her retirement fund by making many small deposits throughout the year. The fund grows at a rate of 7% per year compounded continuously. After 30 years, she retires and begins withdrawing from her fund at a rate of $3,000 per...
March 4, 2014
Ten members of a fraternity take a statistics course. Here are their scores on the first exam in the course. 61,74,47,60,62,63,65,79,55,85. In all 135 students took the exam. The third quartile for all 135 scores was 69. How many students had scores higher than 69?
December 9, 2013
A uniform beam of length L whose mass is m, rest with its ends on two digital scales ( Figure 13.2). A block whose mass is M rests on the beam, its center is one-fourth away from the beam's left end. What do the scales read ?
May 21, 2013
PQ is a vertical tower 95m high, the points R and S are on the same horizontal plane as Q, the angle of elevation of P from R is 35 if QS =155m and Q from RQS=48 1.Calculate the distance of QR 2.Calculate the distance of RS 3.Calculate the are of QRS
May 19, 2013
The Goal Every cult has a stated, vague and metaphorical goal. Because this goal must serve as the "illuminated eye" of the pyramid, it cannot be attainable. Rather, it is expressed as an abstract idea - like "salvation" - which the cult members will enjoy ...
May 9, 2013
For a hypothetical normal distribution of test scores, approximately 95% fall between 38 and 62, 2.5% are below 38, and 2.5% are above 62. Given this information, (a) the mode=_____ and (b) the standard deviation=_____.
March 30, 2013
4. In applying cladistic analysis to construct a phylogeny of the animal kingdom, why would the presence of flagella be a poor choice of a characteristic for the grouping the phyla into clades?
March 25, 2013
Which of the following is an example of active reading? A. Skimming over information and taking notes. B. Reviewing a chapter, question as you read, and review notes. C. Speed reading and taking notes in your own words. D. Both B & C.
February 28, 2013
A block with mass = 5.0 rests on a frictionless table and is attached by a horizontal spring ( = 130 ) to a wall. A second block, of mass = 1.35 , rests on top of . The coefficient of static friction between the two blocks is 0.40. What is the maximum possible amplitude of ...
January 24, 2013
Archimedes purportedly used his principle to verify that the king's crown was pure gold, by weighing the crown while it was submerged in water. Suppose the crown's actual weight was 14.0 N. The densities of gold, silver, and water are 19.3 g/cm^3, 10.5 g/cm^3, and 1.00...
December 3, 2012
A child bounces a 54 g superball on the side- walk. The velocity change of the superball is from 23 m/s downward to 19 m/s upward. If the contact time with the sidewalk is 1 800 s, what is the magnitude of the average force exerted on the superball by the sidewalk?
November 15, 2012