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DonHo
Questions and answers by visitors named
DonHo
Questions (1)
Hey Dr.Bob222,
Pearlite is not ceramic material correct? Just need a second opinion. Thanks!
3 answers
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Answers (141)
Impulses = mass*change in speed Impulse = 1kg * 10m/s = 10 kgm/s
An equation means you need an = sign An expression does not require an = sign for your case: ==> let x be a number ==> increase means to add (+) ==> let y be the final value of the equation ==> x+6=y
Whoa you're right, I read proble wrong did this as if the mass was on an inclined, but only the force is
Draw a FBD then, find component of forces in the x and y direction: F_x=1183*cos(40) = 906.231 N F_y=1183*sin(40)-1039.86 = -279.442 N Now find the resultant force: F_r = sqrt(F_x^2 + F_y^2) F_r = sqrt(906.231^2 + (-279.442)^2) F_r = 948.337 N a = F_r / m
ABCD, please look what what I replied in your last posts. Follow the steps to get a numerical answer.
Follow those steps. 90% of the work is done for you already..
1) m(s2-s1) = dQ/T + S_gen m(s2-s1) = (-8*10^6W)/(127+273) +S_gen find s1 at P=15MPa and T1=500+273.2 (super heated water vapor) s2=6.200 KJ/kg-K you will need to interpolate to find s1: plug all values in to find s_gen, the entropy production rate 3)
1) from 2nd law: S_gen/m = 200/2 = 100 J/kg-K s_gen = 0.10 kJ/kg-K s_gen=s2-s1 = .10kJ/kg-K look in table for ideal gas for air to find s1 => s1 = 6.86926 kJ/kg-k s_gen + s1 = s2 => 0.10 + 6.86926 = s_gen 3) actual temperature of gas at exit: apply change
What's the question?
I think it's asking for the function form
I think this can be looked at from the ideal gas law: PV=nRT Also, Charles law states when Pressure is constant, Volume and Temperature can be related as : V=kT ; where k= nR/P This basically states that if temperature increases, volume will increase and
Area=L * W = 2ft * 14ft = ?? ft^2 Perimeter= 2(L+W) = 2(2 + 14) = ?? ft
Look up a unit circle online. I think 135 degrees
If you draw it out and connect it, you have a triangle using trig, you can do: cos^-1 (10/23)
R = x * p p=-1/10x + 60 function of R(x) : R(x) = x * (-1/10x + 60) What is the question asking?
The function should be: R(n) = (50-2n)*(1300+100*n)
Sorry, I didn't solve it in a calculus manner. F= ∫kdx with upper and lower limits of distance Integrating: F= k*(x_f - x_i) x_f = final distance , x_i = initial distance and the rest should be the same as above post.
F = k*deltax F=force k= spring constant deltax= change in distance find spring constant k: 5lb = k*(12-18)in k = 5lb / (12-18)in k= -0.8333 lb/in force to compress spring to 9inches: F = -0.8333lb/in * (9-18)in
Velocity ratio (V.R) is: distanced moved by effort / distance moved by by load Mechanical Advantage (M.A) =Load/Effort Efficiency = M.A/V.R In the problem: Velocity Ratio = 4 Efficiency = 0.80 Load = 50kg * 9.81m/s^2 = 490.5N Using the formula: Efficiency
a^2+b^2=c^2 the largest side/hypothenuse is c a and b are the other two sides 1) 6^2+10^2 = c^2 check to see if that's true or not
R:T:B = 7:5:3 T=3560 (7/5)*3560 +3560+ (3/5)*3560 =
cot(theta) = Ctan(theta-B) Consider the trig trig identity: cot(theta) = tan(pi/2 - theta) by comparing original equation with identity: C=-1 B = pi/2
dr=0.2cm r=200cm dV/dr = 4*pi*r^2 V=4*pi*r^2*dr V=4*pi*200^2*0.2
Area of circle: Area = pi*r^2 a) (22/7)*7^2 = 154 cm^2 try it
You can also check by just flat out multiplying both fractions together: (5*6)/(3*6) = 30/18
The multiplicative identity stats that you can multiply 1 by any number and the product is that number, so the number stays the same. 5/3 * 6/6 = 30/18 6/6 can be simplified to 1 30/18 can be simplified to 5/3 so: 5/3 * 1 = 5/3 which satisfies the
Step 1: 2^16 * 5^-10 * 19^0 * (5^-8/2^12) * 2^28 note: anything to the 0 power is 1 so 19^0 = 1 2^-16 * 5^10 * (5^-8/2^12) * 2^28 Step 2: combined liked terms note: anything power in the denominator can be written as a non fraction by changing the power
(2/6)*1 = 1/3 pounds of candy (1/3) * (8/10) = 8/30 = 4/15
Let: x=number of minutes y= monthly bill Made up information: AT&T charges $15 as a flat fee and 10cents per minute y=15+0.10x Verizon charges $18 flat fee and 5cents per minute y=18+0.05x Set both equation equal to each other: 15+0.10=18+.05x x=60mins Now
is there anymore data? Or are you suppose to make up your own pricing?
4^1= 4 4^2 = 16 4^3 = 64 4^4= 256 4^5 = 1024 You see a pattern? 4,6,4,6,4 every time the power is odd, it ends with 4 every time the power is even, it ends with 6 2006 is even, so the last digit is 6
4^1= 4 4^2 = 16 4^3 = 64 4^4= 256 4^5 = 1024 You see a pattern? 4,6,4,6,4 every time the power is odd, it ends with 4 every time the power is even, it ends with 6 2006 is even, so the last digit is 6
An irrational number is a number that cannot be expressed as a fraction. Take pi for example: pi = 3.14 You cannot express that as a fraction/ratio. A rational number, is the opposite, you can express it has a simple fraction. example of rational number:
You can also use newton's equations of motion, it's the same concept: http://www.physicsclassroom.com/calcpad/newtlaws v_f^2 = v_o^2 +2*a*d a=acceleration=gravity=9.81 m/s^2 d=distance=2.5 m v_o = initial velocity = 0 (at rest)
potential energy (gravitational) = m*g*h Kinetic energy (motion) = 1/2 * m*v^2 before the orange was dropped from the tree: KE_inital = 1/2 * m * v_i^2 = 0 (because it's a rest, no velocity) PE_initial = m*g*h_i = 40g * 9.81m/s^2 * 2.5 = 981kJ Before its
Vector makes a Triangle a^2+b^2=c^2 a=b=8 km/h 8^2+8^2=c^2 solve for C
This article might help: https://rudyruddell.wordpress.com/2012/12/28/comparison-of-the-first-civilizations/
Ideal gas Law: P*V=m*R*T Found R online: R=specific gas constant = 2.08 kJ/(kg*K) i) m= PV/RT ii) RMS formula: U=(3*R*T)^(1/2) R=specific gas constant T=Temperature in kelvin iii) apply same concept in ii) iv) R_hydrogen = 4.124 try this out yourself
t1+p = t2 so: (a+b)/t2 = (a+2b)/(t2+h) h= ((a+2b)*t2)/(a+b) - t2 h=b*t2/(a+b)
Velocity = distance/time P=a = x/t1 Q=a+b = x/t2 R=a+2b = x/t3 Q stats p hours after P: (a+b)=X/(t1+p) hours after Q should R start: a+2b = X/(t2+h) t1=x/a t2=t1+p t3=t1+p+h Velocity Q = R by manipulating the velocity formula: Velocity/time = distance Q
7% of 1570 = 0.07 * 1570 = $109.9 (Total sales last month / 1570) * 109.9 = ?
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,
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
well if she has 3 shirts and only 1 pair of jeans .. She can only switch her shirts out 3 times So 3 ?
Your multiplying scientific notations (1.08 * 9.3) = 10.044 10^-3 * 10^-3 = 10^(-3+-3) = 10^-6 So. 10.044*10^-6
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
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 for
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
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
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
