Saturday
August 23, 2014

Posts by Damon


Total # Posts: 17,988

physics
10 * 44 = 440 meters
May 30, 2014

geometry
volume = (1/2) (4/3) pi r^3 = (2/3)pi r^3 so 486 pi = (2/3) pi r^3 so r^3 = (3/2)(486) = 729 area of half of hemisphere = (1/2) 4 pi r^2 = 2 pi (729)^(2/3) = 162 pi
May 30, 2014

physics
a = F/m a = (2.36 cos 44.8 ) /.22
May 29, 2014

algebra
Evaluate 3p/q when p=2 and q=6. Answer:1 YES Use < > or = for __ to write a true sentence: 0.001 __ 0.0010 Answer:< Question 3 _______________ = ___________________ Evaluate -3/8 - 5/8. Answer:7 Question 4 ____________________ -8/8 = 1 __________________ Evaluate: 84...
May 29, 2014

engineering mechanics
Just look at the solved problems linked below. This problem may be the most common in all of algebra and beginning physics :) Remember and hour is 3600 seconds.
May 29, 2014

math
Equations have = signs
May 28, 2014

trig
(1 + tan^2A)(1 -sin^2A) but (1 - sin^2 A) = cos^2 A and (cos^2A/cos^2A + sin^2A/cos^2 A) = 1/cos^2 A so we have (1/cos^2 A)(cos^2 A) which is 1
May 28, 2014

math
tan theta = 9/175
May 28, 2014

Math
Nor do I. Have you mixed up two problems?
May 28, 2014

math
11 + 5 = 16
May 28, 2014

Science
Mass does not depend on gravitational constant anywhere. 5 kg is 5 kg b) m g = 5*9.81 N
May 28, 2014

ENGLISH
Pretty Calf says exactly why.
May 28, 2014

math
Find LCD 40 = 2*2*2*5 25 = 5*5 10 = 2*5 so 2*2*2*5*5 = 200 so 15/200 , 32/200 and 20/200 3/40 1/10 4/25 B
May 28, 2014

precal help asap
There are in fact an infinite number of solutions I would try each of the choices I have my calculator set on degrees so 2pi = 360 tan^2 (360/3 ) = 3 Yes that works tan 180 does not work tan -60 does not work tan 300 = nope so only A
May 28, 2014

algebra/please help I have been wrong twice
You are welcome.
May 28, 2014

algebra/please help I have been wrong twice
p(oil) = 1/40 p(gas) = 1/20 p(oil and gas) = 1/800 so (1/40)(395,000) = 9875 (1/20)(125,000) = 6250 (1/800)(520000) = 650 So I get 16,775 income - 25,000 expense = -8225 They expect to lose money I think.
May 28, 2014

PRECAL MULTIPLE CHOICE
sin A/a = sin B/b sin B = (b/a) sin A = 1.036 no solution (sin may not be greater than 1)
May 28, 2014

math
f' = -12 x^2 + 16 x + a f" = -24 x + 16 sheds water when when f" is negative holds waster when f" is positive f" is 0 when x = 2/3 sheds water when x < 2/3 holds water when X>2/3 so B
May 28, 2014

math
f(4) = 64 f(1) = 1 63/3 = 21 = average slope in interval f' = 3 x^2 = 21 x = +/- sqrt 7 in interval x = sqrt 7 = c so A
May 28, 2014

Physics
g is about 32 ft/s^2 in these obsolete units 61.8 miles/hr * 5280 ft/mi * 1 hr/3600seconds = 90.6 ft/s 7 * 32 = 224 ft/s^2 a = change in v/change in tim 224 = 90.6/t t = .4 seconds
May 28, 2014

Science
+2e
May 28, 2014

Science
By the way, remember transportation losses and expenditures including expense and losses of electrical cables particularly under sea.
May 28, 2014

Science
Actually I did not intend to write a PhD thesis before lunch. Post your attempt first please. Use the sources you have learned about (coal, oil, natural gas (fracked or otherwise) , nuc, hydro, wind, waves, solar panels etc )
May 28, 2014

physics
away of course in general for non-relativistic Doppler effect f heard = f emmitted (c+vr)/(c+vs) c = v of wave vr = v receiver (plus if toward source) vs = v source, (plus if source moving away from receiver) use your c of sound 78 = 80 (c+0)/(c+vs)
May 28, 2014

calculus
Horizontal speed constant forever = 80 cos 45 = u = 56.6 ft/s Initial vertical speed Vi = 80 sin 45 = 56.6 ft/s Now you did not give me the quadratic so I will have to solve it with physics v = Vi - g t where g = about 32 ft/s^2 in these obsolete units then h = Hi + Vi t - 16 ...
May 28, 2014

English
I think it could mean one of two things: 1. Instead of arguing about who would pay how much, I "simply" picked the bill up. 2. I "just" picked the bill up a minute ago.
May 28, 2014

Math
2/50 - 75/50 = -73/50
May 28, 2014

technology
work in = work out 10 * 100 = F * 20 F = 50 N
May 28, 2014

Physics
volume of man = 75 liters so density of man = 80 kg/75 L = 1.067 kg/L x(fat density ) + (1-x)(bone density) = 1.067 .9 x + 1.1 (1-x) = 1.067 1.1 - 1.067 = (1.1-.9)x x = .167 or 17%
May 28, 2014

Algebra 1
sorry, read reply wrong. You have it fine
May 28, 2014

Algebra 1
number or blacks = b number of whites = b+10 total - b +b+10 = 2 b+10 black first b/(2b+10) now we have b-1 blacks we have b+10 whites still total = 2b+9 b/(2b+10) * (b+10)/(2b+9) note - not 2b+10 in numerator
May 28, 2014

trig
rise = .1 run tan theta = .1 theta = 5 deg
May 27, 2014

algebra
36 possible outcomes if order matters If it is the sum that matters you have to figure a different probability for every sum for example there are 4 ways of getting a sum of 5 1+4 or 4+1 2+3 or 3+2 to get a sum of 6 though, there are 5 ways 1+5 or 5+1 2+4 or 4+2 3+3 On the ...
May 27, 2014

algebra
I suspect they mean including 1 and 100 and not 2 through 99 so 100 numbers total so 5, 10, 15 ...... 100 are multiples How many? 10 * 2 = 20 20/100 = 1/5 so 1 - 1/5 = 4/5
May 27, 2014

Trig
current north speed = 3.2 sin 38=1.97 N current west speed = 3.2 cos 38 = 2.52 W Total North speed = 8.5+1.97 = 10.47 Total west speed = 2.52 tan theta = 2.52/10.47 theta = 13.53 degrees west of north or 47.47 degrees north of west Is the direction you are GOING (you are still...
May 27, 2014

trig
cos 35 = h/15
May 27, 2014

Physics
Yes, if the friction was less than the force required to accelerate the upper block, it would accelerate more slowly than the bottom one. In other words slip :)
May 27, 2014

Physics
You are welcome :)
May 27, 2014

Physics
F = - k x = -130 (.1) = -13 N if they do not slip m = 6.25 kg a = 13/6.25 = 2.08 m/s^2 force required to accelerate small block = 1.25 *2.08 = 2.6 N do we have that much? weight = m g = 1.25 * 9.81 so max friction = .3*1.25*9.81 = 3.68 N so no slip :)
May 27, 2014

Math? Check Answers Please!!
You are welcome :)
May 27, 2014

Math? Check Answers Please!!
1) yes 2)4^4 * 4^6 = 4^(4+6) = 4^10 3)4^(4+44) = 4^48 4) 3^(4-4) = 3^0 = 1 note ANYTHING^0 = 1 5) 3^-3 = 1/3^3 = 1/27 yes
May 27, 2014

Physics
2.05 2.04
May 27, 2014

Physics
initial momentum forward = (69.5+.47)(2.15) = 150.4 so 150.4 = 69.5 v + .470*16 in second part v ball = 2.15 + 16 = 18.15 m/s 150.4 = 69.5 v + .470*18.15
May 27, 2014

Science
Thanks for catching that !!!
May 27, 2014

Science
You have to add heat so endothermic 129 J per 2 mol 1 mol = 23 + 1 + 12 + 48 = 84 grams 2 mol = 168 grams we only have 18.5 grams so (18.5/168)129 = 14.2 Joules
May 27, 2014

Physics
change in x momentum = 2 * mass * x velocity = 2 * .275 * 4.5 sin 35 force on ball by wall = change in momentum /time = change in momentum/.008 wall on ball is -x so ball on wall is + x direction
May 27, 2014

Math Homework: Check Answers
You are welcome.
May 27, 2014

Math Homework: Check Answers
1. Suppose you earned 8t - 3 dollars on Monday and 6t + 5 dollars on Tuesday. What were you total earnings? Simplify your answer. A) 2t + 2 B) 2t - 8 C) 14t + 2 D) 14t - 8 Answer: A ------------------------------- 8t+6t= 14 t !!! so 14 t + 2 -------------------------------- 2...
May 27, 2014

physics
r w^2 = Ac = 6*10^5*9.81 w^2 = 58.9 * 10^5 /.02 = 29.4 *10^7 = 2.94 * 10^8 w = 1.72 * 10^4 = 17,200 radians/sec
May 27, 2014

probability
-->1 2 3 4 5 6 1 ----- * 2 ----* 3 --* 4 * 5 6 36 possible outcomes get 5 from four of them so p = 4/36 = 1/9 (1/9)180 = 20 times
May 27, 2014

geometry
Area of base = (1/2)(.25)(.25 sin 60) = .0271 m^2 .0271 * h = 7.5 h = 277
May 27, 2014

physical science
You are welcome :)
May 27, 2014

physical science
see below I got 94 %
May 27, 2014

physical science
100( power out ) /power in 100*3760/4000 = 94 %
May 27, 2014

Geometry
between 0 and 1 hour Ann went 3 miles per hour between 1 hour and 4 hours, Ann went 2 miles (5-3) so 2 miles /3 hours = .67 mph between 4 hours and 7 hours Ann went zero miles (5-5) so zero miles/hour (lunch break?) between 7 ours and 10 hours (3 hours) Ann went 5 miles (10-5...
May 27, 2014

ALGEBRA! URGENT. Check Answers!
You are welcome.
May 27, 2014

ALGEBRA! URGENT. Check Answers!
yes
May 27, 2014

ALGEBRA! URGENT. Check Answers!
in #3 + 5x - 7x = NEGATIVE 2 x #4 negative 7
May 27, 2014

math
bottom = pi r^2 top = pi r^2 side = 2 pi r h
May 27, 2014

Physics, am i right?
If you have a whole bunch of resistors in parallel you can do 1/R = 1/R1+ 1/R2 + 1/R3 + 1/R4 .... Since the current has a choice which resistor to go through, you are adding CONDUCTIVITIES (inverse of resistance) C = C1+C2+C3 ... then in the end R = 1/C or you can do them ...
May 27, 2014

Physics, am i right?
You are very welcome :)
May 27, 2014

Physics, am i right?
R = 10*20 /30 = 20/3 i = 9 /(20/3) = 27/20 = 1.35 Amps Yes !
May 27, 2014

calculus
(14x + 4)cos(7x^2 + 4x)dx,substitution u = 7x^2 + 4x. u = 7 x^2 + 4 x du = 14 x dx + 4 dx = (14x+4)dx so we have integral of cos u du which is - sin u + c - sin (7x^2+4x) + c
May 27, 2014

calculus
u = x3 + 5x2 + 18 then du = 3 x^2 dx + 10 x dx so in fact we have u du integrate u^2/2 + c so the hard part is squaring .5 (x^3 + 5 x^2 + 18)^2 + c
May 27, 2014

histoy
Life tenure is democratic NO ! Important people have special rights in a democracy NO People vote in a democracy YES Some slaves freed? What about the rest ? Not the question anyway. Some democracies had slaves (Athens, USA). They may not be proud of it.
May 27, 2014

Physics
R = 10*30 / (40) = 7.5 45/7.5 = 6 Amps
May 27, 2014

Physics
10 in PARALLEL with 30 1/R = 1/R1 + 1/R2 or R = R1 R2 /(R1+R2)
May 27, 2014

Physics
NO!!!
May 27, 2014

algebra
P(mean of A) if mean P(A) = .6 If we have six Apples and four Oranges in a box then P(A) = .6 when we draw one thing at random. If we have a whole bunch of boxes and on the average there are six apples in each then P(A) = .6 BUT The probability that we will draw that mean on ...
May 27, 2014

algebra/Can you see if I am right
Probability of the first one being a king is 4/52 probability of the first one being a face card = 12/52 the probability of the second one being a face card if the first was a king is 11/51 so if you mean probability of choosing a king, then a face card it is 4/52 * 11/51
May 27, 2014

physics
I have no idea.
May 27, 2014

math
add x to both sides x + y = a add -y to both sides x = a - y
May 27, 2014

general chemistry
Number of mols/liter
May 27, 2014

math
Instead of posting it again, read what you posted. It is incomplete. What is K and what does it have to do with the problem. We do not know the ratio of speeds for walking or taking the bus.
May 27, 2014

Physics
V = i R 20 = i (10) i = 2 amps so yes, b
May 27, 2014

algebra/check my answer
find probability that NONE are heads (1/2)^3 = 1/8 so we want 1 - 1/8 = 7/8 agree with you
May 27, 2014

Calculus
y^2 + 4 y = -8 x + 12 y^2 + 4 y + 4 = -8 x + 16 (y+2)^2 = -8 (x-2) vertex at (2,-2) opens left etc
May 27, 2014

algebra
You are welcome.
May 27, 2014

algebra
out of 13 men, 12 are bald? 12/13
May 27, 2014

7th grade Math (polynomials)
maybe: -8.5 x^3 + 0 x^2 + 1.1 x + 0
May 27, 2014

algebra
(-3)^2 -4(-3) + 3 9 + 12 + 3 24
May 27, 2014

math
7! = 7*6*5*4*3*2*1 = 5,040 agree
May 27, 2014

maths
10 *(10^x)^2 - 7 (10^x) = 26 let z = 10^x 10 z^2 - 7 z -26 = 0 ( z - 2)( 10 z + 13) = 0 10^x = 2 or 10^x = -1.3 if you log is base 10 log 10^x = x = log 2 but if x = log a then log a = log 2 so a = 2 similarly log 10^x = x = log (-1.3) but not allowed :)
May 27, 2014

science (check!)
agree, If the predator is not to run out of food, he needs a lot of prey per predator.
May 27, 2014

Math, grade 10
anyway a^2 + (17-a)^2 = 185 a^2 + 289 - 34 a + a^2 = 185 2 a^2 - 34 a + 104 = 0 a^2 -17 a + 52 = 0 (a- 13)(a-4) = 0 a = 4 or 13 so they are 4 and 13 and my initial thought was wrong
May 26, 2014

Math, grade 10
not real numbers 17^2 = 289 which is greater than 185
May 26, 2014

please help
Well, I had a dislocated shoulder once.
May 25, 2014

Algebra II
By the way, there are an infinite number of solutions. eg 3 cos (4x - 7 pi/2)+4 or - 3 cos(4x -pi/2) + 4 etc
May 25, 2014

Algebra II
You are welcome :)
May 25, 2014

Algebra II
also in your explanation explain that the cosine curve is 90 degrees or pi/2 radians behind the sine curve if you graph y = sin theta and y = cos theta versus theta
May 25, 2014

Algebra II
trig identity: sin theta = cos (pi/2-theta) so y = 3 sin (4x-pi) + 4 but from above trig identity y = 3 cos [ pi/2 - (4x-pi) ] + 4 or y = 3 cos (-4x + 3 pi/2) + 4 but cos (- theta) = cos theta so y = 3 cos (4x-3 pi/2) + 4
May 25, 2014

PRECALC QUESTION
6 x +0 y = -24 so x = -4 -4 x + .5 y = 19 so y = 6 -6 + 0 = -6 true (-2)(-2) + (1)(1) = 5 true
May 25, 2014

3D Shapes & Scale
I mean big surface area for its weight
May 25, 2014

3D Shapes & Scale
by the way the ant is not only immensely strong for its weight but that A - k L^2 ratio means it has a big surface area for its length. Therefore it's terminal velocity is much lower than yours.
May 25, 2014

3D Shapes & Scale
1) Archimedes holds you up in the ocean. Water is about 800 times as dense as air. In fact it is about the density of most animals, including people and whales. Therefore when you are in the water you need to exert very little force to hold yourself up. Similarly a whale is ...
May 25, 2014

3D Shapes & Scale
L2 = 10^3 L1 Area 2 = (10^3)^2 = 10^6 Area 1 volume 2 = (10^3)^3 = 10^9 volume 1
May 25, 2014

Ed Tech
By the way, if you include analog as well as digital computers, I was using tube varieties as late as 1964 for simulation of ship motions and vibration measurement and analysis.
May 25, 2014

Ed Tech
Code breaking was one use but the use I am familiar with is generation of tables solving spherical triangles for navigation by sextant. Using a companion volume " Nautical Almanac" you looked up where a ray from the sun or moon or star intercepted the surface of ...
May 25, 2014

Earth Science Regents!!!
Laruen: Google "celestial navigation".
May 25, 2014

need help1 what function to use? math
That is correct
May 25, 2014

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