Friday
December 19, 2014

Posts by sam


Total # Posts: 4,122

physics
A 6.01-kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.291. Determine the kinetic frictional force that acts on the box when the elevator is (a) stationary, (b) accelerating upward with an ...
October 3, 2012

Math
Has memory chip capacity's growth been exponential? How much longer is the exponential growth likely to continue? Explain.
October 2, 2012

Math
Divide 64 bundles of newspapers into two groups so the ratio is 3 to 5.
September 29, 2012

physics
Calculate the velocity needed for an object starting at the Earth's surface to just barely reach a satellite in a geosynchronous orbit. Ignore air drag and assume the object has a speed of zero when it reaches the satellite. (The orbital radius of a satellite in a ...
September 27, 2012

Science
True or false: light travels in straight lines if the medium it travels doesn't change
September 26, 2012

math
When I am rounded to the nearest hundred, I am 3,300. The diiference between my ones and thousands digits is 1. My tens digit is the same number as my ones digit. I can be two different numbers. Who am I?
September 26, 2012

math
Tks, Ms. SUE!
September 26, 2012

Chemistry
Thank you for answering this below Dr Bob
September 26, 2012

Chemistry
What volume of 0.200M of aqueous solution of formic acid, a weak monoprotic acid (KA = 1.78x10-4) and 0.200M aqueous solution of NaOH would you mix to prepare a 500mL of a buffer solution of pH = 4.0. I know I need to use the H-H equation, I'm just not sure what I plug in ...
September 26, 2012

chemistry
q= 4.184(42.3)(10.2-21.9) = -2070.70 J -2070.70J/6.60g KCl = -313.74 J/g -313.74 J/g(74.55g/ 1 mol KCl)= -23389.32J/mol -23.4 kJ/mol Is this correct?
September 26, 2012

chemistry
KCl(s) → K+(aq) + Cl‾ (aq) Solid KCl dissolves as shown in the above equation. A 6.60 g sample of KCl was dissolved in 42.3 g of water. The initial temperature of the water was 21.90°C. After the compound dissolved, the temperature of the water was 10.20°C...
September 26, 2012

Chemistry
What volume of 0.200M of aqueous solution of formic acid, a weak monoprotic acid (KA = 1.78x10-4) and 0.200M aqueous solution of NaOH would you mix to prepare a 500mL of a buffer solution of pH = 4.0.
September 26, 2012

algebra
solve the linear system from problem 1 using elimination 4x-y=5 4x+4y=-4
September 25, 2012

Physics
A plane drops hamper of medical supplies from a height of 2740m during a practice run over the ocean. The plane's horizontal velocity was 126m/s at the instant the hamper was dropped. What is the magnitude of the overall velocity of the hamper at the instant it strikes the...
September 24, 2012

Physics
A person is standing on a spring bathroom scale on the floor of an elevator which is moving up and slowing down at the rate of 2.73 m/s^2. The acceleration of gravity is 9.8 m/s^2. If the person’s mass is 75.2 kg, what does the scale read? Answer in units of n
September 24, 2012

Physics
a 96.4kg boxer has his first match in the canal zone with gravitational acceleration 9.782m/s^2 and his second match at the north pole with gravitational acceleration 9.832m/s^2. What is his mass in the canal zone? answer in units of kg
September 24, 2012

Physics
A boat moves through the water with two forces acting on it. One is a 2304N forward push by the motor on the propeller, and the other is a 2154N resistive force due to the water around the bow. What is the acceleration of the 1293kg boat? Answer in units of m/s^2.
September 24, 2012

Physics
A large uniform chain is hanging from the ceiling, supporting a block of mass 48kg. The mass of the chain itself is 15 kg, and the length of the chain is 2.6 m. The acceleration of gravity is 9.81 m/s^2 Find the tension in the chain at the point where the chain is supporting ...
September 24, 2012

Physics
When a 117 N bag of nails hangs motionless from a single vertical strand of rope, how much tension is exerted in the strand? Answer in units of N
September 24, 2012

Physics
The tension in a string from which a 6 kg object is suspended in an elevator is equal to 61 N. What is magnitude of the acceleration a of the elevator? The acceleration of gravity is 9.8 m/s^2. Answer in units of m/s^2
September 24, 2012

Physics
A person weighing 0.6 kN rides in an elevator that has a downward acceleration of 2.3 m/s^2. The acceleration of gravity is 9.8 m/s^2. What is the magnitude of the force of the elevator floor on the person? Answer in units of kN
September 24, 2012

math
I got 1:633,600 Is that correct?
September 22, 2012

math
Find the scale ratio of this map: 1 inch on the map represents 10 miles
September 22, 2012

instrumental analysis
How long would it take to discharge a 0.026 microFarad capacitor to 6.4 % of its full charge through a resistance of 1.7 MOhm?
September 21, 2012

Math
Thanks!
September 20, 2012

Math
How many liters of oil are required to supply the electrical energy needs of an average home for a month? Energy released by burning 1 liter of oil= 1.2 x 10(7th power) Electrical energy used in an average home daily 5 X 10 (7th power) I got 125 liters. Is that correct?
September 20, 2012

Math
Thanks! I have the same reasoning.
September 20, 2012

Math
Can you help me with this question? Could a person walk across the United States (New York to California) in a year? If not, about how long will it take? Explain your reasoning.
September 20, 2012

Math
Thank you! That helped.
September 20, 2012

Math
How did you get .253m? Wouldn't you multiply by 100?
September 20, 2012

Math
Can You help me with this question? The distance from the earth to the sun is about 1.5 X 10^8 km, while the distance from the earth to the moon is about 3.8 X 10^5 km. If a scale model of the solar system is constructed so that the distance from the Earth to the Sun is 100 ...
September 20, 2012

Math
What is the integral: 1/root(2x-x^2)
September 20, 2012

Maths
What is the integral of: 1/root(2x-x2)
September 20, 2012

Maths
*This is not an answer* Thanks Steve that really helps!!! *This is not an answer*
September 19, 2012

Maths
Integral of 1/root(2x-x^2)dx
September 19, 2012

Chemistry
The solubity of KNO3 at 0 is 20 g and CuSO4.5H2O at 0 is 10 g. i'm lost as to how this pertains to the answers.
September 18, 2012

Chemistry
2) To the solution in problem 1 (d) at 100 degrees celsius, 10g of water are added, and the solution is cooled to 0 degrees celsius... (problem 1d: the number of grams of water required to dissolve a mixture containing 15 g KNO3 and 3.5 g CuSO4 * 5 H20, assuming that the ...
September 18, 2012

literature
someone took away children before they were grown and they cried because they were being taken away
September 18, 2012

probability and statistics
A 0.1μm diameter drop of 1mM protein solution is introduced into pure water centered at x. Assume proteins diffuse randomly by “stepping” a distance 0.1μm every millisecond. a. What is the density at x after 1 minute? b. How many protein molecules are there...
September 18, 2012

geometry
Y is a point on HR with HO=(19x) miles and OR=48 miles. If HR=(27x) miles, find HO (in miles)
September 16, 2012

Physics
While warming up in her tryout as a pitcher for the Montwood softball team, Anabel Parga throws a softball horizontally with a speed of 22m/s. a. If home plate is 19m away, how far should the softball fall from its initial straight-line path on its way to home plate? b. The ...
September 16, 2012

math
how many combination of coins make 2.00 when given 2 quarters, 5 dimes and 18 nickels?
September 15, 2012

physics
An automobile accelerates from rest at 1.3m/s^2 for 19s. The speed is then held constant for 23s, after which there is an acceleration of -0.9m/s^2 until the automobile stops. What total distance was traveled? Answer in units of km.
September 14, 2012

Physics
Highway safety engineers build soft barriers so that cars hitting them will slow down at a soft rate. A person wearing a safety belt can withstand an acceleration of 300m/s^2. How thick should barriers be to safely stop a car that hits the barriers at 92.8km/h? Answer in units...
September 14, 2012

physics
Highway safety engineers build soft barriers so that cars hitting them will slow down at a soft rate. A person wearing a safety belt can withstand an acceleration of 300m/s^2. How thick should barriers be to safely stop a car that hits the barriers at 92.8km/h? Answer in units...
September 14, 2012

physics
An airport has runways only 136m long. A small plane must reach a ground speed of 39m/s before it can become airborne. What average acceleration must the plane's engines provide if it is to take off safely from its airport? Answer in units of m/s^2.
September 14, 2012

Physics
The barrel of a rifle has a length of 0.916m. A bullet leaves the muzzle of a rifle with a speed of 621m/s. What is the acceleration of the bullet while in the barrel? A bullet in a rifle barrel does not have a constant acceleration, but constant acceleration is to be assumed ...
September 14, 2012

physics
A subway train starting from rest leaves a station with a constant acceleration. At the end of 7.94s, it is moving at 12.3864m/s. What is the train's displacement in the first 5.57388s of motion? Answer in unites of m.
September 14, 2012

Physics
A tennis ball with a speed of 14m/s is moving perpendicular to a wall. After striking the wall, the ball rebounds in the opposite direction with a speed of 11.41m/s. If the ball is in contact with the wall for 0.0112s, what is the average acceleration of the ball while it is ...
September 14, 2012

Math
Multiply & write in simplest form: The mississippi river is about 23/25 the length of the missouri river. If the missouri river is 2,540 miles long, how long is the mississippi river? Thanks
September 12, 2012

English
So what about "none of us could figure out how the _______ magison had managed to escape the truck submerged into the tank of water
September 11, 2012

Physics
Initially, a particle is moving at 5.40 m/s at an angle of 37.2° above the horizontal. Two seconds later, its velocity is 6.10 m/s at an angle of 55.0° below the horizontal. What was the particle's average acceleration during these 2.00 seconds in the x-direction ...
September 10, 2012

Physics
A place kicker must kick a football from a point 29.0 m (= 31.7 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 17.8 m/s at an angle of 41.0o to the horizontal. By how much does the ball ...
September 10, 2012

english
yes yes its correct
September 7, 2012

chemistry
potassium chlorate will decompose to produce potassium chloride and oxygen gas . if you begin with 45 kg of potassium chlorate, how many liters of oxygen gas measured at stp might you expect to produce from this reaction
September 7, 2012

Science
What is the purpose of a control group in an experiment? a. To serve as a standard of comparison or b. To be the group exposed to changes in the manipulated variable
September 6, 2012

Math
Convert 60,000 BTU/hr to in.cubic feet/minute.
September 3, 2012

math
setup an equation or expression to model the situation below: find the shortest distance from the point (2,4) to the curve y=4x^3+1
September 3, 2012

math
setup an equation or expression to model the situation: a rectangle that would fit inside of the curve y=-x^2+8
September 3, 2012

math
setup an equation or expression to model the situation below: in one year, sales for a company increase at a constant rate. after two months, the company sells 12,500 products, and after 8 months, the company sells 30,000 products. If the constant rate of increase continues, ...
September 3, 2012

math
setup an equation or expression to model the situation below: what is the volume of a box that can be created from a sheet of metal that measures 12 inches by 30 inches? assumer there is no top to the box.
September 3, 2012

Econ
Explain the apparent paradox that saving money if good for the individual but may be bad for the economy. How is this relevant to public policy today?
September 1, 2012

chemistry
94. mL
August 31, 2012

Health
What is the Affordable Care Act? A. A program that covers diet counseling for people who are at higher risk for chronic diseases like diabetes and high blood pressure. B. A program that allows people who are at higher risk for chronic diseases to gain free memberships to gyms ...
August 30, 2012

Health
What are other factors that contribute to being overweight and obese besides diet and behavior? A. Personality and temperament B. Physical fitness and athletics C. Environment and genetic factors D. Smoking and drinking alcohol I think it should be all of them, but that's ...
August 30, 2012

Health
Thanks again(:
August 30, 2012

Health
What steps should you take to watch your diet? A. Follow a healthy and realistic eating pattern B. Keep your eating patterns consistent C. Eat breakfast everyday D. All of the above d?
August 30, 2012

Health
Obesity can cause a person to develop what type of conditions? A. Head, back, and neck pains B. Increased energy and reduced stress C. Low blood pressure and type I diabetes D. High blood pressure and Type 2 diabetes A?
August 30, 2012

Health
Thanks Ms.Sue :))
August 30, 2012

Health
What is the best way to lose weight and keep the weight off? A. By losing ½ to 2 pounds a week B. By losing 3 to 5 pounds a week C. By losing 6 to 8 pounds a week D. By losing 10 or more pounds a week A?
August 30, 2012

Health
What does the U.S. government use to estimate a person’s body weight status? A. Scale B. Ruler C. Body mass index D. Health related illnesses c?
August 30, 2012

Health
Someone please help?????
August 30, 2012

Health
Adults and children should limit their intake of sodium because? A. Keeping blood pressure in the normal range reduces an individual’s risk of cardiovascular disease, conges¬tive heart failure, and kidney disease. B. Keeping blood pressure in the normal range reduces ...
August 30, 2012

Health
According to the government’s My Plate program, half of our plate should have? A. Pasta and breads B. Seafood C. Fruits and vegetables D. Protein and desserts a? or c? idk:/
August 30, 2012

Health
Americans should drink ________ instead of sugary drinks? A. Energy drinks B. Whole milk C. Water D. Diet soda I put c?
August 30, 2012

Health
Helllp pleease:(
August 30, 2012

Health
What are the four basic food safety principles that work together to reduce the risk of food borne illnesses? A. Wash, Cook, Eat, Clean B. Clean, Separate, Cook, Chill C. Clean, Cook, Store, Disinfect D. None of the above d?
August 30, 2012

Health
Please help:(
August 30, 2012

Health
b?
August 30, 2012

Health
________ physical activity and ________ time spent in sedentary behaviors. A. Reduce; increase B. Reduce; reduce C. Increase; reduce D. Increase; increase
August 30, 2012

Health
A(:
August 30, 2012

Health
d?
August 30, 2012

Health
Added sugars are defined as ________. A. Sugars and syrups that are added when foods or beverages are processed or prepared B. Sugars and syrups that are not added to foods or beverages C. Sugars and syrups that are healthy for the body D. Sugars and syrups that keep the body ...
August 30, 2012

Health
then what is it?
August 30, 2012

Health
Americans are urged to make at least half of their grains whole grains. An example of a food with whole grains includes ________. A. Brown rice B. Pasta C. White bread D. White rice d?
August 30, 2012

Health
thanks(:
August 30, 2012

Health
Based upon the government’s research, they recommend that we do what with regard to our intake of dairy? A. Switch to fat-free or low-fat milk B. Drink whole milk C. Avoid dairy if it causes gas D. Eat more ice cream a?
August 30, 2012

Physics
Man jogs 1.5 m/s. Dog waits 1.8 s then runs at 3.7 m/s. How far will they have each travelled when dog catches up to man? Answer in units of m
August 27, 2012

Physics
Two ants race across a table 57 cm long. One travels 4.14 cm/s and the other 3cm/s. when the first crosses the line, how far behind is the second one? Answer in cm.
August 27, 2012

english
2. The complete predicate of the sentence begins with the word A. great. B. met. C. the. D. sailed
August 24, 2012

us history
how did the New Deal affected gender roles in American society
August 24, 2012

Math
Betsy is making a flag. She can choose 3 colors from red white blue and yellow. How many choices does Betsy have? I get 8 or 16. Am I right? Do I count choices that are in diferint order as another choice? r w b r b w Is that 1 choice or 2?
August 22, 2012

HEALTH
maybe B
August 22, 2012

HEALTH
yeah is c
August 22, 2012

HEALTH
yeah
August 22, 2012

rockford
skyscrapers
August 22, 2012

Physics
This is not an answer!!! Thankyou so much Elena, that was correct and a BIG BIG help. Thankyou so much!!!! This is not an answer!!!
August 19, 2012

Physics
While working on her bike, Amanita turns it upside down and gives the front wheel a counterclockwise spin. It spins at approximately constant speed for a few seconds. During this portion of the motion, she records the x and y positions and velocities, as well as the angular ...
August 19, 2012

Economics
Market analysts often use cross-price elasticities to determine a measure of the “competitiveness” of a particular good in a market. How might cross-price elasticities be used in this manner? What would you expect the cross-price elasticity coefficient to be if the ...
August 13, 2012

Economics
Indicate how an understanding of demand and of elasticity of demand is useful in analysing the following statement. “If total consumer expenditure remains the same after a new tax is imposed on cigarettes then spending on cigarettes will decrease and spending on other ...
August 13, 2012

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