DonHo

Hey Dr.Bob222, Pearlite is not ceramic material correct? Just need a second opinion. Thanks!

10 years ago

netforce=2*19cos45 work=netforce*distance

10 years ago

KE=1/2 1430*1.05^2 solve that. swing: PE at top=Ke at bottom mgh=above KE solve for h Now, the angle. draw the diagram. I see cosTheta=(L-h)/L L is the swing rope length. solve for Theta

10 years ago

1) Each shape as a different moment of inertia formula, for the left end of the rod: I = (1/3)*M*L^2 where m = mass of rod I = (1/3)*6.54*5.12^2 I = 57.14 Now you have to consider the moment of the left end of the sphere too: I = (2/5)*M*r^2 where m = mas...

10 years ago

What's the question? Start with a free body diagram. Post back when you get this.

10 years ago

Use conservation of angular momentum L1*W1 = L2*W2 We're solving for W2 From the information given in the question: L2 = 64*(L1/100) = .64*L1 W2 = (L1*W1)/L2 So plugging this into the momentum equation: W2 = (L1*1.7)/(.64*L1) We can kill the L1 on top and...

10 years ago

Let's count these numbers out. 3..6..9..12..15..18..21..24 4..8..12..16..20..24 From counting by 3's you can see that even though 15, it's two digits adds up to 6, it's not in the list when counting by 4s. 24 is the only one that is in both list. 2+4 = 6...

10 years ago

I agree with you Mark. 5/12 > 1/3 > 1/6

10 years ago

Take a look at this. Follow the steps. If you're lost just post back here. http://www.symbolab.com/solver/trigonometric-identity-calculator/%5Cfrac%7B(cos%5E%7B4%7D(x)-sin%5E%7B4%7D(x))%7D%7Bsin%5E%7B2%7D(x)%7D%3Dcot%5E%7B2%7D(x)-1/?origin=button

10 years ago

The condition is 30 < x <50 where x is an even number You can write down numbers starting with 31 all the way to 49 on paper and try figuring it out from that. OR you can think of two numbers that is bigger than 30 and smaller than 50 where it's 2 digits...

10 years ago

I just convert everything to decimals. 1/4 = .25 .2 = .2 3/8 =.375 30% = .3 Answer: .2 , 1/4 , 30% , 3/8 You are correct, I don't know what it was marked wrong..

10 years ago

Set this up as a ratio: for every 1 cup of walnuts, she needs 2 cups of raisings : 1/2 so now how much cups of walnut does she need for 8 cups of raising 1/2 = x / 8 solve for x

10 years ago

I think all you do is integrate this from 0 to 3 So the integral of x^2 + 2: integral of x^2: x^3/3 integral of 2: 2x so integral: x^3/3 + 2x now integrate this from 0 to 3: from 3: 3^3/3 + 2*3 = 15 from 0: 0^2+2*0 = 0 15 - 0 = 15 I think this is how you...

10 years ago

You're welcome.

10 years ago

Culture B is larger than culture A. 4*10^6 / 8*10^4 = 50 Culture B is 50 times larger than culture A

10 years ago

You can factor an x out of both term x(5x - 34) = 0 x = 0 5x - 34 = 0 x = 34/5 x= 6.8 x = 0 , 6.8 Smallest answer= 0

10 years ago

Here's a similar problem: http://www.jiskha.com/display.cgi?id=1415653817 Post again if you have further questions.

10 years ago

It's almost the same problem, slope is the same thing as the area between the region. But use the same procedures.. Integrate the function. Then plug in x=4 and x=8 f(4)-f(8)

10 years ago

From left side: sec^4x - tan^4x factors into: (sec(x)+tan(x))*(sec(x)-tan(x))*(sec^2(x) + tan^2(x)) (sec(x)+tan(x))*(sec(x)-tan(x)) =sec^2x - tan^2x and from trig identity: sec^2x - tan^2x = 1 left side: 1*(sec^2(x) + tan^2(x)) Right side: 1+2tan^2(x) fro...

10 years ago

Yes.

10 years ago

(8x^4-5x^2+1)^4 =4(8x^4 - 5x^2 + 1)*d/dx( 8x^4-5x^2+1) = 4(8x^4 - 5x^2 + 1)^3*(32x^3-10x^2)

10 years ago

All you do is differentiate the outter exponent first. then multiply that by the derivative of the inside parenthesis

10 years ago

6 - 11 = ??

10 years ago

124.29 * .20 = 24.85 <-- Total amount for tipping 24.85 / 6 = ? I'm guessing this question is asking about the tip only and not the whole entire amount + tip.

10 years ago

Tan^-1(Fy/Fx) Fx = 200*2 Fy = 235*1.5 I think you are right.

10 years ago

You can solve this system of equations in many ways. This easiest way, in my opinion, is by addition. 10x+15y=20 + -9x-15y=-21 --------------------- x=-1 Now you have x = -1 plug that into any of the equations to get y You can also solve this with substit...

10 years ago

point slope form: y-y1=m(x-x1) m=slope y1=3 x1=0 y-3=-4(x-0) y-3=-4x y=-4x+3 <--- equation of the line

10 years ago

Find the derivative of the function: s(t) = -32t^2+112 0 = -32t^2 + 112 t=sqrt(112/32) now once you find t plug it back into the original equation to find the max distance above the ground

10 years ago

Arc length = angle * r 3.78*10^6 = r* .00982 r = radius (length moon is from earth) http://www.coolmath.com/reference/circles-trigonometry.html

10 years ago

Don't feel dumb.. Glad you understand it now.

10 years ago

Draw a freebody diagram. You should get a triangle with you connect the vertical and horizontal. a^2+b^2=c^2 a=22.7 b=58.9 solve for c to get first part second part 2: to find direction, using trig tantheta = opposite/adajacent tan^-1(58.9/22.7) = ?

10 years ago

PE = W*g*h W = 2.3 g=9.8 h= 1.9 PE is in units of Joules http://hyperphysics.phy-astr.gsu.edu/hbase/gpot.html

10 years ago

When it's at the ground h = 0 -16t^2+70t+50 = 0 using the quadratic formula t=5 t=-.625 t cannot be negative, so t=5s is the correct answer. http://www.regentsprep.org/regents/math/algtrig/ate3/quadformula.htm

10 years ago

Hey man, I was in your situation 5-6 years ago too when I came upon this website. I used this website until I graduated high highschool. The tutors are great here!

10 years ago

Look at the coefficient of your leading term and your last term 3x^3 <-- leading term 1 <-- last term finding numbers that can divide into each term evenly Let q correspond to the leading term: q = +-1, +-3 (only numbers that can divide evenly with 3) let...

10 years ago

oops ignore the last part: It's p/q so roots are +-1/+-1 and +-1/+-3 http://www.mathwords.com/r/rational_root_theorem.htm

10 years ago

Are you treating to find the roots? If so use the quadratic formula

10 years ago

Factor: 5x(4x^2-25) roots: 5x=0 x= 0 4x^2-25 =0 x = -2.5 , 2.5 so possible roots: 0, -2.5,2.5

10 years ago

Show me what you did

10 years ago

width=x length = 2x (2 times the width) depth = x-2 volume = l*w*d = 64 in^3 x*2x*(x-2)=64 2x^2*(x-2)=64 2x^3-4x^2-64=0 I got x = 4 after some guessing check: http://www.wolframalpha.com/input/?i=2x%5E3-4x%5E2-64+%3D+0 I agree with you answered for 1 and...

10 years ago

Expression with variable example: 2+2x <-- x is our variable Now if you are given the value of x: x=2 then 2+2*2 = 6 Just substitute the value in for the variable.

10 years ago

I agree.

10 years ago

a) plug 40 into t in the original equation b) solve for t analytically t = 99.021 heres a graph: http://www.wolframalpha.com/input/?i=200e%5E%28-.014t%29%3D50

10 years ago

Nevermind. I'm 100% now that Pearlite is not considered ceramic material.

10 years ago

F = m*a F/m = a

10 years ago

F = m*a m = F/a

10 years ago

F = m*a

10 years ago

24/x = .3 x = 80 so there are total of 80 pies 80-24 = 56 pies left unsold

10 years ago

I just worked this out, I'm not sure if my figure is right. Did you guys learn about moment or torque?

10 years ago

Here is my solution, let me know if the figure is correct with your description: http://i61.tinypic.com/554h2s.jpg

10 years ago

x^2 + y^2 = 20 - x^2 - 6y = 28 ________________ y^2 + 6y = -8 y^2 + 6y + 8 = 0 (y+4)(y+2) y= -4,-2 plug those solution into first equation: x^2 + (-4)^2 =20 x^2 + 16 = 20 x^2 = 4 x=+- 2

10 years ago

p = m*v 25/2 = g\v

10 years ago

2+3w=12+2w subtract 3w from both sides 2=12-w subtract 12 from both sids 10=w to check: 2+3(10)=12+2(10) 32 = 32

10 years ago

v^2/r=g (mass doesn't matter) v^2 = r*g v = sqrt(r*g) v= sqrt(50.5*9.81)

10 years ago

sorry, my formula is off should be v^2*r=g v=sqrt(g/r)

10 years ago

if you cube both sides you get: x^2-4x+4 = 4096 x^2 - 4x -4092 = 0 now use the quadratic formula: http://www.purplemath.com/modules/quadform.htm where a=1 b=-4 c = -4092 let me know what you get

10 years ago

463/16

10 years ago

Wait, sorry i read that question all wrong. It's asking for the total weight of the paper so yeah multiply 463*16

10 years ago

set up system of equations: x = wage of laborers y = wage of concrete finishers 5x+2y = 1200 x+4y = 924 Now solve the system of equations: from the second equation, isolating x we get: x = 924 - 4y now plug that into the first equation: 5(924-4y)+2y=1200...

10 years ago

20/50 = 40% yes I agree.

10 years ago

49/x = .7 solve for x

10 years ago

q=m*c*deltaT q=heat energy m=mass c=specific heat deltaT= T_final - T_initial

10 years ago

q=m*c*deltaT q=heat produced x (7.59)/(molar mass C6H6) m=mass of water c=specific heat of water=4.179J/gC deltaT = T_final - T_initial T_initial = 20 degreeC

10 years ago

Assuming the ceiling is a square Area of square = L*W L*W = 14ft * 14ft = 196ft^2 Area/90ft^2 =?

9 years ago

14+2x=x+9 Move all the variable (x) to one side and the numbers to the other side 5=-x x=-5

9 years ago

The question says that the value has risen steadily, so I'm going to assume each year, the amount increased in the same. Total Value - Initial Value = Amount increased 750,000 - 60,000 = 690,000 Total years: 2017-1977 = 40 years Amount increased each year...

9 years ago

Here's a similar problem: http://www.jiskha.com/display.cgi?id=1473488872 try it out.

9 years ago

Area= L*W Where L = Length, and W = Width Make sure you convert your units.

9 years ago

Total pounds the puppy gained: 0.4 * 11 = 4.4 pounds Total weight of puppy: pounds gained + original weight 4.4 + 11 = 15.4

9 years ago

Let: x= # of Cranberry Bars y= # of Walnut Bars x=4y-66 The problem states that there are equal # of cranberry bars to walnut bars. So, y=x x=4x-66 Solve for x will give you 22 (which is the number of cranberry bars+walnut bars Tony had after he gave away...

9 years ago

Are you aware of the laws of cosines and sines?

9 years ago

I'm confused on the question a little. If it's asking what I think it's asking then: The 3 in the tens place is 1/100 the value of the 3 in the hundred place.

9 years ago

Okay hang on one minute, I will draw and try to work some of it for you to understand.

9 years ago

Here is my solution, if you have any questions, ask here. Link: http://imgur.com/a/DDhSQ

9 years ago

First convert yards to miles: 200 yards = 0.114 miles Set up a relation: (5mins/0.114miles) = x / 2miles Solve for x to get answer in minutes

9 years ago

Glad to help!

9 years ago

Newton's law of motion wrt to displacement: d=v_i * t + 0.5*a*t^2 For the stone being dropped from building: a=accerlation=gravity=9.81m/s^2 d=0+0.5*(9.81)*3^2 For the second stone being thrown up vertically: d=20*3+0.5*(-9.81)*3^2 Since displacement/heig...

9 years ago

average means divide 235.50/3 =

9 years ago

Well Magnitude is sqrt((Fx^2 + Fy^2)) where: Fx is the sum of all forces in x-direction Fy is sum of all forces in y-direction Solution: Fx = 68 + 3 = 71N Fy= 42 + 2 = 44 N Magnitutde: sqrt((71^2+44^2)) = 83.53 Fx=68 - 3 = 65N Fy = 42 - 2 = 40 N Magnitude...

9 years ago

For angle: tan_1(Fy/Fx)

9 years ago

The difference is at the end, it's asking for the error in direction (angle). Apply the same method in your other post. Give it a try.

9 years ago

103 (1+ 0 + 3 = 4) Any combination/order you write will work. 112 (1+1+2=4) Any combination/order you write will work. 220 (2+2+0=4) Any combination/order you write will work. 400 (4+0+0=4) Only this combination/order will work. You should have a total of...

9 years ago

Typo: For any combination, 0 cannot be the first number.

9 years ago

just add all the i vectors, j vectors, and k vectors up respectively Then magnitude is: sqrt((i^2+j^2+k^2))

9 years ago

Area of ceiling = area of floor Sum of Area of floor and ceiling is: A=(5*4) + (5*4)

9 years ago

a) when at rest PE=mgh h=8m mgh = (15kg)(9.81m/s^2)(8m)=1177.2 J KE = (1/2)*m*v^2 there is no velocity, v=0 so KE = 0J b) PE=(15kg)*(9.81m/s^2)(8/2m) = ?J There is no KE while it's falling KE = 0J c) PE= m*g*h = (15)(9.81)(0) =0J KE =(1/2)m*v^2 where v=sq...

9 years ago

for part c), I made a typo: KE = (1/2)*(15)*(12.53)^2 = 1177.2J

9 years ago

…… What the heck

9 years ago

distance = rate*times d=50*t also d=60*(t-3) set both equation equal to each other: 50*t=60(t-3) solve for t t= 18 hours so plug t into either equation to get distance 50*18 = 900miles

9 years ago

http://www.mathportal.org/algebra/solving-system-of-linear-equations/elimination-method.php

9 years ago

There should be an equal force exerted by the surface of the table. 10 Newtons

9 years ago

You have 2 equations and 2 unknowns. You can solve by many methods, lets try substitution method. p=2q+3 <-- eqn 1 p+q = 9 <-- eqn 2 plug eqn 1 into eqn 2: 2q + 3 + q = 9 simplify: 3q=6 q=6/3 = 2 Now you have q=2 , you can plug that value into eqn 1 or 2...

9 years ago

26+27 = 53 26 and 27 are both addends. The question asks to make one addend move up to the next ten's number. 27 + 3 = 30 26 - 3 = 23 so, 30+23 = 53 or 26+4=30 27-4 = 23 so, 30+23 = 53 What you wrote is mathematically correct, but that's not what the ques...

9 years ago

key words: Marked at half price means the CD is 1/2 the original value Less means minus, So, with the half price and discount: let x = price of original CD (1/2)*x-4.50 = 4.50 solve for x to find the original price of the CD

9 years ago

Area of trapezoid: A= (a+b)*h / 2 where: a= top base b= bottom base h= height note: a and be are the only parallel sides in a trapezoid 240 = (10+b)*20 / 2 solve for b

9 years ago

KE = (1/2)*m*v^2 PE = m*g*h ME=KE+PE initially from rest: Everything is 0 As it leaves from rest, and reaches maximum height, PE increases (because from the formula, h increases) When it reaches max height, for a moment, the stone will stop in the hair fo...

9 years ago

If they are belted, the velocity should be the same. Diameter * pi = Circumference Circumference * rev/min = velocity ==> Diameter*pi * rev/min = velocity 8*pi*250 = d*pi*200 solve for d

9 years ago

Your multiplying scientific notations (1.08 * 9.3) = 10.044 10^-3 * 10^-3 = 10^(-3+-3) = 10^-6 So. 10.044*10^-6

9 years ago

well if she has 3 shirts and only 1 pair of jeans .. She can only switch her shirts out 3 times So 3 ?

9 years ago

Shape geometry: Square For a square, all four sides are the same length. If you draw a diagonal line from the lower left corner to the upper right corner, you'll have 2 right triangles. The diagonal line is called the hypothenuse of a right triangle. The...

8 years ago

The difference in each term is: 13, 15, 17 So each time, the difference is increased by 2 The genera; formula for the next 3 terms: (T_n-1 - T_n-2 + 2) + T_n-1 = T_n => 2*(T_n-1) -(T_n-2) + 2 = T_n let n = the number of term (1,2,3..ect) For the 5th term,...

8 years ago