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drwls
Questions (23)
The school assembly room has 10 rows of chairs with 20 chairs in each row. If the third-grade classes fill 4 rows of chairs, how
1 answer
399 views
I have only been able to answer a few tonight. Preference is and will be given to questions in which evidence of work or thought
1 answer
1,162 views
You should have posted this as a new question, not as a comment to someone else's thread.
<< 3x+5-4x = 7? >> Just combine "x"
2 answers
640 views
We are not going to do that work for you, but will be glad to help you.
The unit sphere is the sphere with radius 1 centered in
1 answer
1,173 views
<<y=(1/A)*integral from a to b of: (1/2)[f(x)]^2 dx >>
If that is the y value of the center of mass, I don't know why the factor
1 answer
549 views
The "x intercept" is where y = 0, which is where the curve crosses the x axis.
Solve y = x^2+ 2x- 8 = 0 You can write that as y =
1 answer
506 views
This is a "trial and error" type question. Algebra alone won't help you.
First see what you could do buying 19 cow brains ($95)
1 answer
581 views
Equate the increase in potential energy at the higher elevation, M g H, to the decrease in kinetic energy. Make sure you include
2 answers
724 views
Are you trying to solve for x, n or p?
solve for n Show me how to work this problem. 2n = 4xp - 6 what is the problem? what grade
2 answers
570 views
The stored potential energy in the trampoline at maximum compression, (1/2) k X^2, equals the gravitational potential energy at
3 answers
934 views
Do you want the equation of a line through that point (1,2) with slope m = 4?
Use the equation (y-y*) = m(x - x*) where x* and y*
1 answer
464 views
That's the same as the integral of sin^2 x dx.
Use integration by parts. Let sin x = u and sin x dx = dv v = -cos x du = cos x dx
1 answer
785 views
Derivatives are usually not taught in 5th grade. That is what your question is about: Rates of change.
Complete the following
4 answers
3,563 views
The derivative tells you the slope at any point.
df/dx = 8 x^3 - 12 x When x = 3, the slope is m = 8*27 - 36 = 180 and the
1 answer
595 views
I believe Lance meant to write x = -5/18
I am wondering why you have two minus signs before the number 13. Two minuses make a
1 answer
495 views
24/(x+1) + 12/(4-x) = 14
Multiply both sides by (4-x)(x+1) 24(4-x) + 12(x+1) = 14(4-x)(x+1) 96 - 12x + 12 = -14(x^2 -3x -4) =
1 answer
748 views
No to both questions. A polynomial is a sum of at least one integer power of x (or other unknown), each multiplied by a
1 answer
485 views
(1 & 2)
The first three points do not fall on a straight line, and there is no value of k that will make that happen. (4) To find
2 answers
647 views
They may want you to add the fractions and give the answer in forms of a fraction. in that case, you need to convert to common
3 answers
1,196 views
The indefinite integral, or which call the "antiderivative", of f'(x)=6x-8x^3
is f(x) = 3x^2 - 2x^4 + C where C is any constant.
1 answer
651 views
First of all, you need to know how many g of Mg actually reacted in the first reaction. You can determine this by determining
1 answer
1,298 views
Bartolomeu Dias first rounded the Cape of Good Hope in 1488. Ten years later, Vasco da Gama also sailed around the Cape and
2 answers
842 views
Some is released if the temperature is increased. Some O2 is always entering and leaving solution at the same time. You end up
2 answers
650 views
Answers (27,109)
thank you i finally understand
you're way smarter than I am.
Use the inverse square law. You will need to look up the radius of the earth. It is about 3960 miles, as I recall. Square the ratio of the the distances to the center of the Earth at the top and the bottom of the building. Use that factor to compute the
oh wow, crazy teacher huh? well it means to just multiply it
and she used the money for trip to africa
Already answered. math - MathMate, Saturday, May 28, 2011 at 11:00pm Here we have 10 digits, of which the first one cannot be zero. If the three digits are distinct, there are 9 choices for the first digit, still 9 (including zero) for the second, and 8
Where is the road sign? What does Roseville have to d o with it?
A balance measures mass. A graduated cylinder measures the volume of liquids.
a. If you are only given the value of ƒÆ , you cannot deduce the value of the radius r. b. ƒÆ = pi - 0.213 rad = 2.929 rad csc ƒÆ = 4.739 c. cos ƒÆ = -0.977 d. cot ƒÆ = 1/(tan ƒÆ )= - (8/(�ã3)
If T is the half life in days (1.6)/2.0 = (T/156)^(1/2) 0.8 = 0.08006 T^1/2 9.992 = T^1/2 T = 99.8 days The decay constant k is related to the half life by k = ln2/T
Let the unit cube side be a. Its volume is a^3. Its area is 6a^2. The ratio is a/6. The inscribed sphere has a volume of (pi/6)a^3 and an area of pi*(a/2)^2*4 = pi a^2. The ratio is a/6. The inscribed right cylinder has a volume (pi/4)a^2*a = pi*a^3/4 and
N = 2^1 + 2^2! + 2^(1000!)!) The last number has no ending digits as small as 2 or 4 006 would be the last three digits of the complete number.
Let the tension be T and the acceleration be a. Write separate free body diagram equations for the two weights T - 100g*sin37 = 100 a 70 g - T = 70 a 170 a = 9.82 g a = 0.058 m/s^2 Now solve for T
Yes. The "normal" force is the perpendicular component. There can be a parallel component as well.
20 kg wt = 200 Newtons Force Component along ground = 200*cos 60 = 100 N Work = 20 * 100 = 200 J
For the speed of the car (V), solve V^2/R = 2 m/s^2 V = sqrt400 = 20 m/s The centripetal force is (acceleration)*(Mass) = 2*2500 = 5000 N Centrifugal acceleration is the opposite of centripetal acceleration
The time interval doesn't matter. F = (0.060 kg/s)(15 m/s) = 0.90 N
I agree
What is the meaning of P(6,6)? Is it the value of P(x,y) where x = y = 6? Is that 2/(3x) or (2/3)*x on the right?
unanswered You have used 0 of 4 submissions
f = (1/2pi)*sqrt(k/M) Hz M = 1481 kg k = 81*9.8/0.015 = 52900 N/m f = 5.0 Hz.
The kinetic energy does not change. What does that tell you?
delta S = entropy change = 1.6*10^5*[1/293 - 1/T2] = 470 Solve for T2
frequency = 600 Hertz (beats per second) Wavelength = (speed of sound)/(frequency) = (340m/s)/600 (s^-1) = 0.57 m
What are the dimensions of the 2.05? Meters displacement?
You want to know Young's and the shear modulus, E and G, not Young's and shear modules. The equations you need can be found at http://silver.neep.wisc.edu/~lakes/PoissonIntro.html Your last sentence is incomplete.
____ cubic meters, since r is in meters.
Let ds be the density of steel in kg/liter. Let df be the average density of gasoline. You will need to look it up. Avg density = [2.6 + 15/df]/[2.6/ds + 15]
The ratio of the resistances will be the same as the ratio of the resistivities, if lengths and diameters are the same. R(Cu)/R(Al) = 1.72 x 10-8/2.82 x 10-8 = 0.61 R(Al) = 0.509 Ù
Never mind the General Relativity approach I suggested. Time goes slower at the lower orbit because of Special relativity . Use the two different satellite speeds to deduse the time shift for one orbit. You want the extra credit.. so you do the numbers
I assume you are being asked about the change in the rate of a clock in a gravitational field (of the sun, in thic case). There is a General Relativity formula for it. (Due to Schwarzschild, I believe) delta T = T*(delta V)/c*2 V is the gravitational
What does the symbol h represent? The arrow from reactants to products? Here is one answer. 3 H2(g) + N2(g)-> 2 NH3(g) The others are not hard. You need to try them yourself.
Plane mass increases by a factor of 2^3 = 8. Plane lift increases by a factor 2^2 = 4 Plane drag increases by an unknown factor between 1 and 2. Engine power will have to increase to compenstate for increased prssure drag and boundary layer friction. The
3% gets compounded 20 times. 5000*(1.03)^20 = $9030.56
What questions?
What kind of length unit is "hm"?
Don't you mean 90 m/hr? I have never heard of a length unit abbreviated "hm"
How fast is it accelerating? You don't say. To get the power required, you need the kinetic energy at a later time, or the rate of acceleration.
Your numbers require units. That is one of the first lessons you ahould have learned about physics.
The slope of the line is m = (y2-y1)/(x2-x1) =(3-6)/(4-0) = -3/4 When x = 0, y = 6, so the y-intercept is 6. y = (-3/4)x + 6 is the equation you want.
The E-field in any direction is the rate of change of potential with distance along that direction. The a question contains the words"the following", you really must state what the choices are. And please stop changing names.
what are the choices?
Recheck you numbers. Telescopes have long focal lengths and their eyepieces (if used) have short focal lengths. The telescope length, if you are using a refractor, is the sum of the objective and eyepiece focal lengths. Assuming you got the numbers mixed
(average velocity)*(time) = 23.9 m/s*12 s = 286.8 m
Write an equation for the E-field along the line joining the two charges. Let the position of the charge be x. Set the E-field equal to zero and solve for x. You can assume that x has to be > 50 cm, so that the fields due to the two charges oppose each
At 60,000 Pa gauge pressure, the absolute pressure inside the ball is 101,325 + 60,000 = 161,325 Pa Dropping the absolute temperature from 293 to 283 K decreases the absolute pressure in the ball by a factor 283/293, resulting in 15,582 Pa. Subtract
What you have written in not a balanced chemical reaction. Where is the arrow (->) ? An arrow must separate the two sides of the reaction. What is h2? Cr2O3 is not a gas
"Plaastids" is misspelled. You will have to write your own poem. This may help: http://www.readwritethink.org/files/resources/interactives/acrostic/
No work is done, because the dock does not move. However, some of the kinetic energy of the wave will be converted to heat and small-scale vorticity and turbulence in the water. A large fraction of the ocean wave energy will also be reflected by the dock.
Someone left out the word WORK in your question. The question should read: "How much Work do you do if you push a garbage can with a force of 30N while sliding it 4 meters" The answer is Work = Force x Distance, which is 120 Joules in this case.
