Total # Posts: 523
To stop an elevator in free fall, brakes are installed between the walls of the elevator car and the walls of the shaft in which the car moves. In addition, springs with compression coils are installed on the floor, at the bottom of the shaft, in order to absorb the residual ...
September 2, 2010
a) Describe the niche of the sea lamprey. b) Find out how sea lampreys may have entered the Great Lakes ecosystem. c) Identify the interspecific interactions of the sea lamprey and its effects on the Great Lakes.
August 12, 2010
3. Describe the role of microorganisms (bacteria or viruses) in: a. Genetic manipulation and medical research b. Ecosystem (such as bacteria used as decomposers. Oil spill clean up) c. Food industry (microbes which are used to make yogurt)
August 12, 2010
Using the words hypertonic, hypotonic, and equilibrium correctly , predict what happens when, A) A living cell is placed into fresh water and B)A different living cell is placed into salt water.
June 14, 2010
Algebra 2 Honors
The amount of light emitted from a battery indicator bulb pulses while the battery is charging. This can be modeled by the equation y = 60+60sin[(pi/4)t] , where y is the lumens emitted from the bulb and t is the number of seconds since the beginning of a pulse. At what time ...
June 6, 2010
Please can you tell me if these are correct. Identify the noun clause. I put brackets around them. 1. (How the secret leaked out) was not immediately apparent. 2. (Where the stall has moved to) has not been ascertained. 3. The invited guests said (they would attend the party...
June 5, 2010
What is the difference between a noun phrase and a noun clause? This says to change box b into noun phrases to match box A. Example: I can't get over... I hear her rude comments. I can't get over hearing her rude comments. But in this section of the book, it explaines ...
June 4, 2010
We have to identify the noun phrases, I've put brackets around them. 1. (the children) are playing in the back garden. 2. Justin came to school with his (younger sister). 3. (the old woman) hobbled into the kitchen. 4. Look at (the short ugly looking boy) who is throwing ...
June 4, 2010
Please help me in any way to relate the concepts of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. I appreciate any direction or info you could provide, Dr. Bob Thank you
June 2, 2010
A certain gas has a volume of 20 cu ft and a pressure of 10psia at -40 degrees F. What is the new pressure if the gas is compressed to 5 cu ft at -40 degrees C.. a. 0.025 psia b. 0.4 psia c. 10 psia d. 40 psia.
May 18, 2010
assume that a set of test scores is normally distributed with a mean of 100 and a standard devaiton of 20. Use teh 68-95-99.7 rule to find the following quantities: a. percentage of scores greater than 120
May 16, 2010
assume the body temperature of healthy adults distributed with a mean of 98.20F and a standard deviation of 0.62F. If you have a body temperature of 99.00F, what is your percentile score?
May 16, 2010
Using teh 68-95-99.7rule. Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: a. percentage of scores less than 100 b. relative frequency of scores less than 120 c...
May 10, 2010
Which of the following statements are correct? a. a normal distribution is any distribution that is not unusual b. the graph of a normal distribution is bell-shaped c. if a population has a normal distribution, the mean and the median are not equal d. the graph of a normal ...
May 10, 2010
Electrical system are governed by Ohm's law, which states that V = IR, where V=voltate, I=current, and R=resistance. If the current in an electrical system is decreasing at a rate of 9 A/s while the voltage remains constant at 14 V, at what rate is the resistance ...
May 2, 2010
Explain the Modernization and Dependency theories as they relate to underdevelopment. What are the major contributions of each theory and what are the greatest weaknesses? Explain which theory of underdevelopment has greater empirical support, particularly statistical support...
January 16, 2010
When a horizontal force of 7N acts on a block on a resistance free surface, it produces an acceleration of 3.5m/s^2. suppose a second 4kg block is dropped onto the first. what is the magnitude of the acceleration of the combination if the same force continues to act? Assume ...
December 7, 2009
Problem:: A 4.80 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=13.5 N at an angle q= 17.5° above the horizontal. What is the speed of the block 3.90 seconds after it starts moving? What I've got:: Using sin and cos, I'...
November 20, 2009
A 70.0 kg climber is supported in the "chimney" by the friction forces exerted on his shoes and back. The static coefficients of friction between his shoes and the wall, and between his back and the wall, are 0.760 and 0.610, respectively. What is the minimum normal ...
October 26, 2009
#1 is grammatically corect I think it sounds better. In #4 They will make you get better grades. The correct way to say that is They will help you get better grades. In #5 From your friends you can get help. The correct way to say that is You can get help from your friends.
September 9, 2009
What is the definition of the word "hamebells" from the book "The Red Pony" by Steinbeck. I have searched all dictionary sources I could and can't seem to find out anythin on it. Is it, perhaps, a slang word for something else?
September 9, 2009
student perform 2 melting point determinations on a crystalline product. In one determination, the tube contained a sample 1 - 2 mm in height, and the melting point was 141 - 142 ¢ªC. In the second determination, the sample hight was 4 - 5 mm and the melting range ...
September 1, 2009
Student in O-Chem Lab conducts a melting point experiment with an unknown compound and observes a melting range of 210 218C. Is this a typical range for a melting point? If not, what range would be typical? For this question, does it mean an unknown compound in general...
August 30, 2009
Find the minimum volume of hot water needed to dissolve 100 mg of salicylic acid. Can someone help me how to start this out? I would greatly appreciate it. The data is [temp] [amount of salicylic acid per 100 ml water, g] 0 0.10 10 0.13 25 0.23 50 0.63 75 1.8 90 3.7
August 29, 2009
Can someone please check my answers below for accurateness? The instructions are: Differentiate and simplify. 1) y=(2x^2+3x-1)(3x^2-5x-3) y'=(4x+3)(3x^2-5x-3)+(2x^2+3x-1)(6x-5) 2) y=(5x^2+3x-1)(3x^2-5x-3) y'=(10x+3)(4x^2-3)+(5x^2+3x-1)(8x) 3)y=6x^3-7x^2+5x-7+x^(5/3)-7...
August 7, 2009
a) determine the equation of the line that is perpendicular to the tangent to y=5x^2 at (1,5). b) determine the equation of the line that passes through (2,2) and is parallel to the line tangent to y=-3x^3-2x at (-1,5).
August 2, 2009
Occur age group after age group and repeat time after time Should there by any dashes or hyphens here? should it be like: occur age-group after age-group and repeat time-after-time ???
July 3, 2009
A) A rectangle has perimeter 64 cm and area 23 cm^2. Solve the following system of equations to find the rectangle's dimensions. length=23/width length + width = 32 B) Solve the system of equations x^2+y^2=1 xy=0.5
June 7, 2009
The dimensions of a gift box are consecutive positive integers such that the height is the least integer and the length is the greatest integer. If the height is increased by 1 cm, the width is increased by 2 cm, and the length is increased by 3 cm, then a larger box is ...
June 7, 2009
I just have a quick question regarding this question: Simplify. State any restrictions on the variables. log(x^2+7x+12)-log(x^2-9) my answer is log[(x+4)/(x-3)] which is correct. However, for the restrictions, I believe that they are: x>3 and x<-4.. But the back of the ...
June 6, 2009
How bright a star appears can depend on how much light the star actually emits and how far away it is. The stellar magnitude scale can be adjusted to account for distance as follows: m_2 - m_1 = log (b_1/b_2) Here, M refers to a star's absolute magnitude, that is, how ...
May 16, 2009
A long distance swimmer is able to swim through still water at 4km/hr. She wishes to swim from Port Angeles, WA due north to Victoria, B.C., a distance of 50km. An ocean current flows through the Strait of Juan de Fuca from west to east at 3km/hr. In what direction should she ...
October 19, 2008