Saturday
November 29, 2014

Posts by john


Total # Posts: 6,353

physics
Isn't "g" constantly -9.8 m/s/s, regardless of height?
March 14, 2013

Math
What do you mean by median? Do you mean average?
March 14, 2013

Algebra
Distribute the 0.03, 0.17y+0.03y+270=870 0.17y+0.03y = 600 0.20y=600 y= 3000
March 14, 2013

English
Could you please check the grammar in the following sentences? Thank you very much in advance. 1.I had just turned off the light to go to sleep and I was dozing off when I felt/experienced the greatest fear in my life 2.He had tried to get in touch with Sam when he arrived in ...
March 14, 2013

Algebra
What is the sum of all the possible values of a for which 25x^2 + (a-15)x + 9 has exactly one distinct real root?
March 13, 2013

Algebra
How many distinct prime factors does 100100 have?
March 13, 2013

english
what is girl in this sentence Sarah is a very smart young girl with a bright future. Is it a predicate nominative
March 13, 2013

english
The lake is finally smooth tonight after everyone rode jet skis and boats. is smooth the predicate adjective
March 13, 2013

english
what is girl in this sentence Sarah is a very smart young girl with a bright future.
March 13, 2013

english
what is smooth in this sentence The lake is finally smooth tonight after everyone rode jet skis and boats.
March 13, 2013

english
Is mommy the indirect object The girls baked mommy some brownies for Mothers day.
March 13, 2013

english
Is this a complete sentence or a fragment...... Smite a scorner, and the simple will beware.
March 13, 2013

english
Is this a question Smite a scorner, and the simple will beware.
March 13, 2013

Calc
could i get this step by step pls lim (20x + 400)/(x) as x->∞
March 13, 2013

Physics
A mass spectrometer is used to examine the isotopes of uranium. Ions emerge from the velocity selector at a speed of 3.00 x 10^5 m/s and enter a uniform magnetic field of 0.600 T directed perpendicularly to the velocity of the ions. What is the distance between the impact ...
March 13, 2013

Calculus
A magic tank starts out 4 inches in length, 4 inches wide, and 12 inches deep. As the tank is filled, it magically expands proportionally keeping it rectangular form just big enough to hold the liquid. If the liquid is being pumped into the tank at 8 cubic inches per minute, ...
March 12, 2013

Physics
Every once in a while a bird will get hit by a baseball during a baseball game. The longest home runs in baseball land about 500 feet (which is 152.4 meters) from home plate. If these balls leave the bat at a 45 degree angle to maximize their distance, what is the minimum safe...
March 12, 2013

Physics
You are holding onto a 100 kg basket of fish hanging over the side of a boat. What is the minimum force in Newtons you need to exert to keep the basket from falling back down into the ocean?
March 12, 2013

Calculus
A train driver is driving along and he suddenly puts on the brakes. After he holds the brakes for t seconds, the train's sliding distance can be measured as d(t) = 30t - 0.6t^2 (in meters). When the train stops, how far did the train slide (in meters) after the train ...
March 12, 2013

Calculus
Given f(x) = \frac{x^3-2x+5}{x+4} and f’(3) = \frac{a}{b}, where a and b are coprime positive integers, what is the value of a+b?
March 12, 2013

Geometry
7 points are placed in a regular hexagon with side length 20. Let m denote the distance between the two closest points. What is the maximum possible value of m?
March 12, 2013

Geometry
In distinct odd-town, the inhabitants want to number their houses with 3-digit positive integers that are odd, which have all distinct digits. What is the maximum number of houses in odd-town?
March 12, 2013

Algebra
In a certain positive fraction \frac{a}{b} , the numerator is 2 less than the denominator. If the numerator and denominator are interchanged, the fraction is increased by 1 \frac{1}{15} . Find a + b .
March 12, 2013

Algebra
How many distinct prime factors does 100100 have?
March 12, 2013

Calculus
Given f(x) = x^4 + 6x^3 - 15x + 7, evaluate \displaystyle \lim_{h \to 0} \frac{f(1+h) - f(1-h)}{h}.
March 12, 2013

Calculus
a and b are integers that satisfy: \displaystyle \lim_{x \to 1} \frac{x-1}{x^2-ax+b} = -\frac{1}{3}. What is the value of a+b?
March 12, 2013

Physics
You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10~m/s^2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?
March 12, 2013

Algebra
Joe picks 2 distinct numbers from the set of the first 14 positive integers S = \{1,2,3,\ldots,14\}. The probability that the sum of the 2 numbers is divisible by 3 can be expressed as \frac{a}{b}, where a and b are coprime positive integers. What is the value of a+b?
March 12, 2013

Trigonometry
ABC is a non-degenerate triangle such that 2\sin \angle B \cdot \cos \angle C + \sin \angle C = \sin \angle A + \sin \angle B, what is the value of \lfloor 100 \frac {AC}{AB} \rfloor ?
March 12, 2013

Algebra
If f(x) = 2x + 5 and g(x) = 8-3x^2, what is the value of f(g(4)) - g(f(4))?
March 12, 2013

Algebra
How many ordered pairs of solutions (a, b) are there to \frac{a}{b} - \frac{b}{a} - \frac{2}{a} - \frac{2}{b} = 0, where a and b are integers from -100 \leq a,b \leq 100?
March 12, 2013

Algebra
What is the sum of all the possible values of a for which 25x^2 + (a-15)x + 9 has exactly one distinct real root?
March 12, 2013

Algebra
Consider all three-digit numbers that are greater than the sum of the squares of their digits by exactly 543. What are the last three digits of the sum of these numbers?
March 12, 2013

Algebra
Find the largest possible real value of \sqrt{(x-20)(y-x)} + \sqrt{(140-y)(20-x)} + \sqrt{(x-y)(y-140)} subject to -40\leq x \leq 100 and -20\leq y \leq 200.
March 12, 2013

Algebra
Let \phi(n) be the Euler Phi Function. If 1 \leq n \leq 1000, what is the smallest integer value of n that minimizes \frac{\phi(n)}{n}?
March 12, 2013

Algebra
Suppose f(x) and g(x) are non-zero polynomials with real coefficients, such that f(g(x))=f(x)\cdot g(x). If g(2)=37, what is g(3)?
March 12, 2013

Algebra
Given the system of equations \begin{cases} x(x+y) &=& 9 \\ y(x+y) &=& 16 \end{cases} the value of xy can be written as \frac{a}{b} where a and b are positive coprime integers. Find a+b.
March 12, 2013

Geometry
Let S = \{ 1, 2, 3, \ldots 12\} and T_1, T_2, \ldots T_a be subsets of S such that T_i \not \subset T_j \, \forall i \neq j . What is the maximum possible value of a?
March 12, 2013

Geometry
Determine the largest positive integer N, such that given any N-gon (not necessarily convex), there exists a line (infinitely extended in both directions) that contains exactly 1 edge of the N-gon. The figure in blue is an example of a 20-gon that doesn't satisfy the ...
March 12, 2013

Geometry
Six standard six-sided die are rolled. Let p be the probability that the dice can be arranged in a row such that for 1\leq k \leq 6 the sum of the first k dice is not a multiple of 3. Then p can be expressed as \frac{a}{b} where a and b are coprime positive integers. What is ...
March 12, 2013

Math
72 strips of wood. 8 divide 4 equal 2, and it 1 inch wide. so 36 wide. so there 36 times 2 which is 72
March 12, 2013

Physic
An aluminum ring of radius 5.00 cm and resistance 2.00 10-4 Ω is placed around the top of a long air-core solenoid with 997 turns per meter and a smaller radius of 3.00 cm, as in the figure below. If the current in the solenoid is increasing at a constant rate of 267 A/s...
March 12, 2013

Physic
A pickup truck has a width of 78.9 in. If it is traveling north at 36 m/s through a magnetic field with vertical component of 33 µT, what magnitude emf is induced between the driver and passenger sides of the truck?
March 12, 2013

Math
you multiply each number by three and it will be your denominator
March 12, 2013

science
cell membrane
March 12, 2013

English
I urgently need to prepare these sentences for tomorrow. Could you please have a look at them? 1.If they told me to clean my room, I would. 2.You’d better take the keys in case I might still be out when you come back. 3. Would all this have happened if he hadn’t ...
March 12, 2013

physics
A string under a tension of 43.0 N is used to whirl a rock in a horizontal circle of radius 2.45 m at a speed of 20.9 m/s on a frictionless surface as shown in the figure below. As the string is pulled in, the speed of the rock increases. When the string is 1.00 m long and the...
March 12, 2013

Government
In which type of colony did strict governors anger the colonists? A. the royal colonies B. the proprietary colonies C. the charter colonies D. the informed colonies
March 12, 2013

SCIENCE
when a diorite partially melts, which element(1)............ decreases in the melt as a(2).......... magma forms. I have few options to choose from a)iron b)andesite c)rhyolite d)potassium f)basalt No one has
March 12, 2013

maths
Find the largest possible value of sqrt[(x-20)(y-x)] + sqrt[(140-y)(20-x)] + sqrt[(x-y)(y-140)] if -40<=x<=100 and -20<=y<=200
March 12, 2013

Probability
The probability that it will take 5 or more flips of a fair coin before it lands on heads can be written as a/b , where a and b are coprime positive integers. Find a+b
March 12, 2013

Chemistry
I was given extra credit to find who Le Châtelier's High School Principal was. Not his PrincipLE, but his PrincipAL. My chemistry teacher told us only one student of his out of all these years came with the answer. Think outside of the box. Thanks.
March 11, 2013

SCIENCE
when a diorite partially melts, which element(1)............ decreases in the melt as a(2).......... magma forms. I have few options to choose from a)iron b)andesite c)rhyolite d)potassium f)basalt
March 11, 2013

Math
the median was 142 I forgot a number 142 is also on my list. thank you so much for your help
March 10, 2013

Math
Dr. Jane I came up with this: 127,128,129,139,139,139,141,143,144,145,146,147,148,152 Does this seem to work?
March 10, 2013

math
make up a set of 15 numbers with the following landmarks: maximum: 152 Range: 25 Mode: 139 Median: 142
March 10, 2013

Geometry
What is the minimum distance between any point on the circle x^2 + y^2 = 25 and the line y = -\frac{3}{4}x + \frac{75}{4} ?
March 10, 2013

Geometry
In the 2001 population census, information was collected about the number of people in each household, which is denoted by X. It is given that P(X=1) = 0.25, P(X=2) = 0.32, P(X=3) = 0.18, P(X=4) = 0.15, P(X=5) = 0.07, P(X=6) = 0.02 and P(X\geq 7) = 0.01. If R is the ...
March 10, 2013

Geometry
Martin's iPod has 24 songs on it. He wants to make a playlist consisting of three songs to dance to. Let N be the number of different playlists Martin can make. What are the last 3 digits of N?
March 10, 2013

Calculus
Evaluate \displaystyle \int_1^{10} \left(\sqrt{x} + 1\right)^3 dx - \int_1^{10} \left(\sqrt{x} - 1\right)^3 dx .
March 10, 2013

Trigonometry
If g(t) = 5t+1 and h(n) = 2(n - 7), what is the value of h(g(3))?
March 10, 2013

Algebra
Find the smallest positive integer N such that 13^N \equiv 1 \pmod{2013}.
March 10, 2013

Physics
You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10~m/s^2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?
March 10, 2013

Calulus
Given \displaystyle \int_0^{\frac{3\pi}{2}} x^2\cos x \, dx = a - \frac{b\pi^2}{c}, where a, b and c are positive integers and b and c are coprime, what is the value of a + b + c?
March 10, 2013

chemistry help !!!!!!!!!!!!!!!!
a)A N6+ ion in its ground state absorbs an X-ray photon of energy 2.0000 keV. Explain what happens to the ion and why. b)Explain why the nitrogen ion N6+ is a hydrogen-like ion. Assuming the ion is for the major stable isotope 14N, state which sub-atomic particles it contains ...
March 10, 2013

SCIENCE
when a diorite partially melts, which element(1)............ decreases in the melt as a(2).......... magma forms. I have few options to choose from a)iron b)andesite c)rhyolite d)potassium f)basalt
March 9, 2013

Geometry
Given a 100 by 100 square grid, what is the most number of 1 by 51 rectangles that we can cut out of it?
March 9, 2013

Geometry
ABCDE is a regular pentagon. FAD is an equilateral triangle, such that points F and E are on the same side of line AD. What is the measure (in degrees) of \angle FAB?
March 9, 2013

Geometry
How many perfect squares less than 1000 end with the digit 6?
March 7, 2013

Geometry
What is the minimum distance between any point on the circle x^2 + y^2 = 25 and the line y = -\frac{3}{4}x + \frac{75}{4} ?
March 7, 2013

Trigonometry
\sqrt{i} in polar form can be written as r(\cos \theta + i \sin \theta), where r is a real number and 0 \leq \theta \leq \frac{\pi}{2}. What is the measure of \theta (in degrees)?
March 7, 2013

Algebra
Out on my street, there are a certain number of pigeons sitting on telephone poles. If there were exactly 2 pigeons sitting on each telephone pole, then 1 pigeon would have no space to sit on. If there were exactly 3 pigeons sitting on each telephone pole, then there would be ...
March 7, 2013

Algebra
Out on my street, there are a certain number of pigeons sitting on telephone poles. If there were exactly 2 pigeons sitting on each telephone pole, then 1 pigeon would have no space to sit on. If there were exactly 3 pigeons sitting on each telephone pole, then there would be ...
March 7, 2013

Algebra
Out on my street, there are a certain number of pigeons sitting on telephone poles. If there were exactly 2 pigeons sitting on each telephone pole, then 1 pigeon would have no space to sit on. If there were exactly 3 pigeons sitting on each telephone pole, then there would be ...
March 7, 2013

Calculus
Evaluate \displaystyle \lim_{x \to 0} \frac{e^{44x} - 1}{x^2+2x}.
March 7, 2013

Algebra
Alan and Bob are playing with numbers. Starting with the number n=1 they take turns performing arithmetic manipulations with n. Alan goes first and always multiplies n by 3. Bob adds 1 or 2 to the number n, depending on a coin toss. A number is called reachable, if it can ...
March 7, 2013

Algebra
what is the smallest positive integer N such that 13^N \equiv 1 \pmod{2013}
March 7, 2013

Algebra
The difference of the cubes of two consecutive odd positive integers is 400 more than the sum of their squares. Find the sum of the two integers.
March 7, 2013

Geometry
Circles \Gamma_1 and \Gamma_2 intersect at 2 distinct points A and B. A line l through A intersects \Gamma_1 and \Gamma_2 at C and D, respectively. Let M be the midpoint of CD. The line MB intersects \Gamma_1 and \Gamma_2 again at E and F , respectively. If MA=129, MB =156 and...
March 7, 2013

Geometry
ABCD is a convex quadrilateral satisfying AB=BC=CD, AD=DB and \angle BAD = 75^\circ. What is the measure of \angle BCD?
March 7, 2013

Geometry
Two of the heights of a triangle are 63 and 147 . Given that the third height is also an integer, what is the maximum possible value for the third height?
March 7, 2013

math
I don't understand
March 7, 2013

math
thank you, Ms.sue
March 7, 2013

math
Mike is saving money for a new bike that costs $180.00. If m represents the amount of money he has saved so far, which expression represents the amount of money, in dollars, he still needs to save? a. 180 + m b. 180 - m c. 180 ' m d. 180 . m
March 7, 2013

physics
I child with a mass of 20kg,hops on a merry go round with moment of intertia of 1000kg and radius of 7m.if it takes the child time T to move 360degrees ,relative to the ground at 6m away from the center,what is the angle covered relative to the ground
March 7, 2013

Chemistry
A 1.00 kg gold bar at 1010 K is dropped into 0.750 kg of sand at 25 °C. Assuming no heat is lost to the atmosphere, what is the final temperature of the sand?
March 7, 2013

Chemistry
A 1.00 kg gold bar at 1010 K is dropped into 0.750 kg of sand at 25 °C. Assuming no heat is lost to the atmosphere, what is the final temperature of the sand?
March 7, 2013

Calculus
Given that \displaystyle \int_0^4 x^3\sqrt{9+x^2} dx = a, what is the value of \lfloor a \rfloor?
March 7, 2013

Physics
You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10~m/s^2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?
March 7, 2013

Geometry
ABCD is a convex quadrilateral satisfying AB=BC=CD, AD=DB and \angle BAD = 75^\circ. What is the measure of \angle BCD?
March 7, 2013

Geometry
A circle \Gamma cuts the sides of a equilateral triangle ABC at 6 distinct points. Specifically, \Gamma intersects AB at points D and E such that A, D, E, B lie in order. \Gamma intersects BC at points F and G such that B, F, G, C lie in order. \Gamma intersects CA at points H...
March 6, 2013

Geometry
Let G be a rectangular grid of unit squares with 3 rows and 8 columns. How many self-avoiding walks are there from the bottom left square of G to the top left square of G?
March 6, 2013

Physics
What must the critical angle be if light transmits from diamond into water?
March 6, 2013

Physics
A racquet ball with mass m = 0.224 kg is moving toward the wall at v = 14.8 m/s and at an angle of è = 27° with respect to the horizontal. The ball makes a perfectly elastic collision with the solid, frictionless wall and rebounds at the same angle with respect to ...
March 6, 2013

math
simpplify. (3x)^3 (note use positive exponents only.) my answer is 27x^3
March 5, 2013

language
Those trees have (fewer, less) fruit on them.
March 5, 2013

language
Of the 2 swimmers, Dana is the (more better, best, better)
March 5, 2013

Algebra
What is \left \lfloor ( 3 + \sqrt{5} ) ^3 \right \rfloor?
March 4, 2013

math
please display graph of 2x=1 (if can be) thanks
March 4, 2013

Algebra
What are the sum of the roots of f(x) = x^2 - 16x + 63?
March 4, 2013

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