Monday
March 30, 2015

Posts by Jennifer


Total # Posts: 2,086

physics
The circle is horizontal, so there is no force from gravity along the string. 45N >= m*v^2 /r 45N >= 0.33*v^2/0.65
October 4, 2012

Algebra
You'll have to calculate it taking into account the different ways you could wrap the box. If you wrap it around the perimeter perpendicular to the 7inch length, and then closing on the two 4.5x4 faces,you need wrapping paper with a length of 4.5*2+4*2 = 9+8 = 17 and width...
October 4, 2012

check my precalc
2. yes, 4 (the highest degree is of the term 4x^4) 4. good! as long as 1/2x means 0.5* x and not 1 / (2*x) 6. Expanding x(x-1) = x^2 - x; the degree is 2 (from the term x^2) 8. good 10. good 12. good
October 4, 2012

check my precalc
2. yes, 4 (the highest degree is of the term 4x^4) 4. good! as long as 1/2x means 0.5* x and not 1 / (2*x) 6. Expanding x(x-1) = x^2 - x; the degree is 2 (from the term x^2) 8. good 10. good
October 4, 2012

algebra
The distance traveled by the 9:00 train from 10:00 onward is x(9:00) = 36 + 36 * t Where t is the time in hours after 10:00 The distance traveled by the 10:00 train from 10:00 onward is x(10:00) = 42 * t Set these two equal to each other to find the time at which they have ...
October 4, 2012

physics
43 - ckf * 140 = m*a where ckf is coefficient of kinetic friction. In your textbook ckf is probably represented as the greek letter mu, but it's really hard to write greek letters here. . . m is the mass of the sled, and a is its acceleration. Since the sled is moving at a...
October 4, 2012

physics
35 - ckf * 16 = m*a where ckf is coefficient of kinetic friction. In your textbook ckf is probably represented as the greek letter mu, but it's really hard to write greek letters here. . . m is the mass of the sled, and a is its acceleration. x = 1/2 * a * t^2 v = a * t ...
October 4, 2012

chemistry
1). half life = ln(2) / lambda where lambda is the radioactive decay constant 2). A(t) = 12mCi * e ^ - (lambda * t) where t is time, A(t) is activity as a function of time 15 hr = ln2 / lambda solve for lambda convert 2.5 days to hours Then t = 2.5 days * (24 hrs / day) Plug ...
October 4, 2012

Physics
a) x = 1/2 * a * t^2 where x is distance, a is acceleration, and t is time 16 = 1/2 * a * 0.1^2 Solve for a (it's units will be cm/s) b) Now that you know the acceleration calculate x when t = 0.1 seconds (0.1 = 0.05 + 0.05), and then calculate x when t = 0.05 seconds. ...
October 4, 2012

Physics
v = a * t, where v is speed, a is acceleration, and t is time 110 m/s = a * 11 Solve for a
October 4, 2012

Math
1/2% of 50 = (1/2) * 0.01 * 50 Whenever you see a percent sign, you must divide by 100 (equivalently multiply by 0.01) to convert the percent to a decimal number
October 4, 2012

Physics
1.00 * 103 rpm is a unit of angular velocity. a = w^2 * r, where a is radial acceleration, and w is angular velocity, and r is the radius You need to express your answer as a multiple of g, which is in units of m/s^2 Convert w = 1.00 * 103 rpm to rps (rotations per minute to ...
October 3, 2012

physics
The period is given by T = 2 * pi * (r^3/(G*M))^0.5 where T is the period, r is the radius, G is the gravitational constant, M is the mass of the earth convert 621 km to meters look up the Gravitational constant and the mass of the earth in kg plug in the numbers, and solve
October 3, 2012

algebra
15 pounds per square inch * 30 square inches =
October 3, 2012

math
For every 1/2 inch of the scale, the actual width is 3 feet. 2 / (1/2) inches = 4 4 * 3 =
October 3, 2012

math
4. The distance is ((y2-y1)^2 + x2-x1)^2)^.5 plugging the numbers in: ((-6-2)^2 + (4 +2)^2)^.5 = square root of (64 + 36) a. square root of 52 Just type in 52 ^ 0.5 into your calculator imagine your axes are centered on a clock. The first quadrant (quarter on a clock) is x ...
October 3, 2012

Math - Need urgent help!
1200 = 0.0333 * assessed value assessed value = .4 * market value solve the 1st equation for the assessed value, then plug this number into the second equation and solve for the market value
October 3, 2012

math
.15 * x = 3.75 Solve for x
October 3, 2012

Math
GP + 0.04 * GP = 23200, where GP is gross pay 1.04 * GP = 23200 Solve for GP
October 3, 2012

science/math/physics
start the shopper at (0,0) After pushing the cart 41 m south, he's now at (0, -41) After turning west and pushing the cart 28 m, he's now at (-28, -41) Now he has to turn 90 degrees again. . . he will then be going either north or south. . . south will result in the ...
October 3, 2012

Algebra II Funtion
Substitute f(4) = -7 into the equation for f(x): f(x) = x - 11 * (-7) f(x) = x + 77 f(x) =9x3 - x2 + 2 ; f(2) For this one, f(2) means find the value of f(x) when x = 2, so just put 2 into the equation for f(x) and solve
October 3, 2012

arithmetic
385 is between 300 and 400. Which is it closer to? (400) 4012 is between 4000 and 4100 Which is it closer to? 856 is between 800 and 900 Is it closer to 800 or 900? If you were given a number like 850, which is exactly between 800 and 900, you would round up to 900. That's...
October 3, 2012

math
You can simplify this expression by adding like terms: 8-3 = 5 2y + 9y = 11y So the equation becomes: 5 + 11y
October 3, 2012

Chemistry
The molar mass of H2 is 2.02 grams 1.25/2.02 is the number of moles of H2 multiply the number of moles of H2 by Avogadro's number, and you have the number of molecules of H2 multiply the number of molecules of H2 by 2 and you have the number of atoms of H
October 3, 2012

Physics
First, make sure all units are compatible: Convert 15 minutes to hours, since the speeds are listed in km per hour. 15 minutes / 60 min/hr = .25 hours Set up algebra equations: Then let x be the distance traveled by the car that travels at 70 km/hr Let y be the distance ...
October 3, 2012

thermodynamics
P1 * V1 = P2 * V2 Where P1 and V1 are the initial pressure and volume, P2 and V2 are the final pressure and volume. 1 atm * 100 ft^3 = P2 * 1 ft ^3 P2 = 100 atm; use your book or the internet to find a conversion factor from atm to psi
October 3, 2012

Math
First you need to know what you are rounding off to -- the nearest ten, the nearest cent, the nearest 100? . . . Here's an example: 1558.23 Round 1558.23 to the nearest tenth: 1158.23 is between 1158.2 and 1158.3; it's closer to 1158.2, so 1158.23 rounded to the ...
October 3, 2012

Science
Overpopulation occurs when a population outstrips the available resources to provide a basic standard of living. Consumption overpopulation occurs when a population outstrips the available resources to provide a basic standard of living, plus an additional consumptive standard...
October 3, 2012

Math
There are 2 digits in the number of national parks, and this number is less than 30 Therefore, you know that the number of parks is between 10 and 30 Both digits are even. . .there are only a few numbers between 10 and 30 that have 2 even digits. They are 20, 22, 24, 26, 28 ...
October 2, 2012

Physics
Your question is missing some units 8.9 what? 8.9 miles per hour? 8.9 feet per second? To find the distance in inches that Larry runs you multiply average speed * time, but you first might have to do some conversions to make sure units are compatible. For example if Larry'...
October 2, 2012

physics
the net force acting on the boat is 2100 N - 1600 N = 500 N a) Force = mass * acceleration 500 N = 1200 * a Solve for a, the acceleration in m/s^2 b) distance = 1/2 * a * t^2 where t is time distance = 1/2 *a*40^2 Plug in the acceleration from (a) and solve for the distance in...
October 2, 2012

Algebra II
This will be factored into an expression of the form (A*a + B)(C*a + D) Multiplying out: A*C*a^2 + A*D*a + B*C*a + B*D = A*C*a^2 + (A*D + B*C)*a + B*D = 12a^2-17a-5 which means A*C = 12 A*D + B*C = -17 B*D =-5 Then start trying whole numbers. . .B and D have to be +/- 1 or +/-...
October 2, 2012

Math
1. Romeo, Juliet, _ _ _ _ 2. Juliet, Romeo, _ _ _ _ 3. _ Romeo, Juliet _ _ _ 4. _ Juliet, Romeo _ _ _ 5. _ _ Romeo, Juliet _ _ 6. _ _ Juliet, Romeo _ _ 7. _ _ _ Romeo, Juliet _ 8. _ _ _ Juliet, Romeo _ 9. _ _ _ _ Romeo, Juliet 10._ _ _ _ Juliet, Romeo There are 5*2 ...
October 2, 2012

Math
40^2 = 1600 50^2 = 2500 So his age has to be between 40 and 50 What number between 40 and 50 when squared is a number between 1800 and 1900? 43^2 = 1849 if he was 43 in the year 1849, then he was 0 (the age he was born) in ???
October 2, 2012

Math
Let c be the number of chocolate chip cookies, and b be the number of brownies. b + c = 11 0.4 * c + 0.5 *b = 5.10 Use algebra to solve for b and c
October 2, 2012

physics
E = k * q/r^2 The distances all have to be converted to meters because you want everything in SI units a) at x = 0, the field from the first charge is k * 8.71 / 0.03m^2 the field from the 2nd charge is k * -28.6 / 0.09m^2 So the total electric field is the sum of these ...
October 2, 2012

Algebra
0.18 * 240
October 2, 2012

math
24 + 23 + 22 + 21 + . . . + 2 + 1 = This is the sum of all the cards in the deck. This sum has to be evenly divided by the numbers of piles, so divide this number by 6, and that is your answer.
October 2, 2012

Math
The average after the next student took the test was (20*75 + x)/21 = 76 Solve for x
October 2, 2012

physics
The impulse delivered to the ball is the change in momentum The beginning momentum is the mass of the object multiplied by its initial speed (0.1 kg * 4.0 m/s) = .4 kg m/s The final momentum is the mass of the object multiplied by its final speed (0.1 kg * 3.8 m/s) = 0.38 kg m...
October 2, 2012

Algebra
To find the greatest common factor, first list the factors of both numbers, then find which one is the greatest shared factor. For example, to find the greatest common factor of 20 and 30: Factors of 20: 1, 2, 4, 5, 10, 20 Factors of 30: 1, 2, 3, 5, 6, 10, 15 The common ...
October 2, 2012

physics
This is like a right angled triangle with hypotenuse 86.4 and one side adjacent to the right angle 62.5. Use the pythagorean theorem: x^2 + 62.5^2 = 86.4^2 Solve for x.
October 2, 2012

calculus
y'> 0 on the intervals This means, for what range of x values is y' = 3x^2 - 3 positive, or in other words, for what range of x values is the graph of y' above the x axis y' < 0 This means for what range of x values is y'= 3x^2 -3 negative, or in ...
October 2, 2012

science
x = 1/2 a * t^2 v = a * t where x is distance, a is acceleration, t is time, and v is speed First you have to get the units to match. You probably want your answer of acceleration to be in ft/second^2, so convert 330 mph to ft/s 330 miles/hour = 330 miles / 3600 s = 0.0916 ...
October 2, 2012

6th grade math
square
September 26, 2012

statistics
80%
September 26, 2012

Mathematics
The association has $2000 in its reserve fund that it will use to help pay for repairs. How much must the association charge each of the 5o homeowners if the total cost for the repairs is $13,350?
September 25, 2012

Mathematics
Tito Sanchez receives a weekly salary of $400. he also receives a 6% commission on the total dollar amount of all sales he makes. What must his total sales be in a week if he is to make a total of $790?
September 25, 2012

Chemistry H.
Indium has two naturally occurring isotopes and an atomic mass of 114.818 amu. In- 113 has a mass of 112.904 amu and an abundance of 4.3%. What is the identity and percent abundance of indium's other isotope. I am very confused on how do I set up this conversion problem?
September 23, 2012

Chemistry H.
I don't understand how to set up the conversion problem.. Or what exactly it's asking
September 23, 2012

Chemistry H.
Assume that the nucleus of the fluorine atom is a sphere with a radius of 5 x 10 ^ -13 cm. Calculate the density of matter in the fluorine nucleus in grams/cm^3. Now convert your answer to tons per cubic centimeter, knowing that there are 454 grams in one pound.
September 23, 2012

Physics
Real life experience: I am not exceptional in math but I have managed to learn chemistry by using only a couple books and the internet. I spend hours on my smartphone with practice questions and homework questions that I've found on the net. I'm not even a student in a...
September 18, 2012

Calculus Based Physics II
An air-filled spherical capacitor is constructed with inner and outer shell radii of 6.4 cm and 16.1 cm, respectively. Calculate the capacitance of the device. The value of the Coulomb constant is 8.98755 × 10 9 N·m^2/C^2 Answer in units of pF
September 15, 2012

math
I would add 5 and 5 first because that equals 10, and its easy to add things to 10
September 13, 2012

math
equation d=55h the distance a person drives when traveling 55mph. (h=time in hours, d+ distance in miles.Use equation to complete the table.)
September 13, 2012

Business Math
How did you find $650?
September 10, 2012

Pre-Algebra
the sum of a number and 14.5
September 8, 2012

Physics
start the shopper at (0,0) After pushing the cart 50 m south, he's now at (0, -50) After turning west and pushing the cart 19 m, he's now at (-19, -50) Now he has to turn 90 degrees again. . . he will then be going either north or south. . . south will result in the ...
September 4, 2012

Math Pre-Algebra
5.2 (division sign) 1.25
September 2, 2012

math Pre-Algebra
5.2
September 2, 2012

Math Pre-Algebra
explain why 1 raised to any power is equal to 1
September 2, 2012

pre cal
(y^2)^-4y^8 simplify
August 30, 2012

Math Pre-Algebra
help!! does anyone know how to write an expression to represent the number of minutes in x hours
August 30, 2012

English
Thank you I looked at it and have changed the thesis to this. Since the first case of C.Diff in 1935, all the lives lost and money spent could all have been prevented. Does this sound better?
August 29, 2012

English
I am trying to write a thesis statement for a research paper I have to write. The paper is over C. Diff this is a disease. Here are my ideas I am just not sure that either are even written correctly. 1. Deaths caused by Cloustridium Difficiule are preventable. 2. Simple ...
August 29, 2012

English
have your ccake and eat it to.
August 17, 2012

history
The animating principles of Benedict's rules for monks are the quest for salvation and A. knowledge obtained solely through communion with God. B. the subordination of willfulness. C. extremes of self-mortification. D. the application of personal resistance to God's work.
August 17, 2012

history
so rice
August 17, 2012

history
A staple food transplanted from Southeast Asia to the Mediterranean world as a result of the Islamic Empire was a. rice b. wheat c. yams d. potatoes i think b
August 17, 2012

History
What group colonized many small islands in the Pacific Ocean? a. Japanese b. Chinese c. Koreans d. Polynesians
August 17, 2012

math
27
August 17, 2012

math
100
August 17, 2012

reading
cut the 2, 3, 4th pages in the sections but stop about 1/2 inch from the staples say this is your 2,3,4 page make your cuts here ___________________ * * ______*_____*______
August 17, 2012

physic
A dog sled weighing 750 lb is pulled over level snow at a uniform speed by a dog team exerting a force of 60 lb. Find the coefficient of friction.
August 16, 2012

animal science
so the answer would be B?
August 15, 2012

animal science
Which of the following is true of the function of glucagon? A. Glucagon regulates insulin secretion. B. Glucagon increases glycogen breakdown into glucose. C. Glucagon inhibits glycogen breakdown into gluclose. D. Glucagon regulates somatostatin secretion.
August 15, 2012

chemistry
Ethanol (C2H6O) is combusted with oxygen to produce carbon dioxide and wateraccording to the following reaction: C2H6O + 3O2 -----> 2H2O + 3CO2 If 50g of ethanol is combusted, determine the volume of carbon dioxide that will be produced if the temperature is 25oC and the ...
August 3, 2012

Tech Math
A 490 newton woman stands on a bathroom scale while riding in a elevator that is accelerating downward at 2m/sec/sec. Find her apparent weight and her apparent mass. Compare to her starting mass.
July 19, 2012

Music
4. -Pop Rock -Soft Rock -Hard Rock
July 17, 2012

Physics (Angular Momentum)
A solid ball of radius 10cm and mas 8kg rolls in the y direction with a speed of 10 m/s At the instant that it is 3m from the origin along the x axis, what is the angular momentum (mag + direction) about its center of mass?
July 13, 2012

statistics
An April 15, 2002 report in Time Magazine stated that the average age for women to marry in the United States is now 24.9 years of age. If the standard deviation is assumed to be 4.9 years, find the probability that a random sample of 33 U.S. women would show a mean age at ...
July 7, 2012

statistics
First graders who misbehave in school may be more likely to be regular smokers as young adults according to a new study presented in the July 2004 issue of the American Journal of Epidemiology. After following a group of U.S. first graders for 15 years, it was found that among...
July 7, 2012

composition
In Weeks 9 and 10, you will develop an essay using definition as the rhetorical strategy. This week, you will complete your essay. Review the criteria for a definition essay. Continue with the essay you started in Week 9. Expand your definition by including the word's ...
June 23, 2012

Physics
Three fixed charges are located along a line. The - 2 C charge is 10cm to the left of the +5 C charge and the -4 C charge at 4 cm to the right of the +5 C charge. a.what is the force exerted on the -4 C by the +5C charge? b.what is the force exerted on the -4 C by the -2 C ...
June 21, 2012

Math
A chain store manager has been told by the main office that daily profit, P is related to the number of clerks working that day, x, according to the equation P= -25x^2 + 300x. What number of clerks will maximize the profit, and what is the maximum possible profit?
June 18, 2012

Math
If a baseball is projected upward from ground level with an initial velocity of 64 feet per second, then its height is a function of time, give by g(t)= -16^2 + 64t. What is the maximum heigh reached by the ball?
June 18, 2012

Physics Velocity Question
The equation for the displacement in meters of an object moving in SHM is x(t) = 1.50 cos (4.20t) where t is in seconds. (a) What is the maximum speed of the object? (b) At what time does it first reach the maximum speed? I already got 6.3m/s for A and I got B wrong. I thought...
June 15, 2012

PHYSICS
A cylindrical metal can with a radius of 4.25 cm is floating upright in water. A rock is placed in the can, causing it to sink 0.0230 m deeper into the water. What is the weight of the rock?
June 15, 2012

accounting
The annual interest rate for a customer’s loan of $425 is 15.75%. What is the total dollar amount to be repaid on the loan, including principle and interest, for the entire year?
May 31, 2012

Math
A customer paid $247.13 in interest on a loan of $950.50. What is the percentage of interest paid?
May 31, 2012

Mat 116
What is the solution of the system 7r - 5s = 36 and 5r + 7s = 68
May 30, 2012

physics
The route followed by a hiker consists of three displacement vectors , , and . Vector is along a measured trail and is 1060 m in a direction 20.0 ° north of east. Vector is not along a measured trail, but the hiker uses a compass and knows that the direction is 35.0 ° ...
May 29, 2012

Math
you're setting sales goals for next month, you base your goals on previous avg sales. The actual sales for the same month for the last 4 yrs have been 24 units, 30 units, and 27 units, what is the avg number of units you can expect to sell next month
May 27, 2012

waves and optics
Cherenkov radiation is light emitted by a particle moving through a medium with a speed greater than the speed of light in the medium. (Note: The speed of the particle is not greater than the speed of light in a vacuum.) Consider a beam of electrons passing through water with ...
May 27, 2012

physics
does this work as the same phenomenon as the moon ???
May 27, 2012

physics
A planet orbits a star once every 3.14x10^7 s in a nearly circular orbit of radius 1.51x10^11 m. (a) With respect to the star, determine the angular speed of the planet b) With respect to the star, determine the tangential speed of the planet. c) With respect to the star, ...
May 25, 2012

english
I wrote an essay because i'm apply to get into the honor's program. I'm supposed to write about who i was, who i am now, and who I would like to be. I would appreciate it if I got some feed back along with grammar correction. Is my essay even close to being okay or...
May 22, 2012

math
Find a quadratic function in standard form that has 3-1/4i as a zero and also passes through the point (1,-70).
May 21, 2012

math
39+(-88) -29 - (-83)=
May 21, 2012

physics
An electron ( mass = 9.11×10−31 kg) leaves one end of a TV picture tube with zero initial speed and travels in a straight line to the accelerating grid, which is 1.85 cm away. It reaches the grid with a speed of 2.95×10^6 m/s . (You can ignore the ...
May 19, 2012

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