Friday
October 24, 2014

Posts by bobpursley


Total # Posts: 36,390

Physics
mgh=1/2 mv^2 solve for v
October 24, 2014

metric conversion
1gram=10centigrams 1gram=1000milligrams Can you take if from here?
October 22, 2014

Trigonometry
What is the identity for Sin(A+B)?
October 22, 2014

Physics
first find the time it takes the ball to reach a final height of 2.1m hf=hi+16.5sin52.5*t-5.9t^2 you know hf-hi=2.1 solve the quadratic for time. Then how far does the person have to travel? in the horizontal d=16.5cos52.5 * t and the person has to have an average speed of v=(...
October 22, 2014

Chemistry
420=35g*cwater*(tf-10) put cwater in (watch units, need J/gC) solve for tf
October 22, 2014

physics
see other post
October 22, 2014

physics
what is the weight of a column of fluid ? weight=massdensity*area*height *9.8N/kg pressure=weight/area=massdensity*9.8 *10 so, put in the massdensity of whatever you have filled it with, in kg/m^3, and you have it.
October 22, 2014

Math
let sides be a,b,c let then b =2c-2 but b+c>22 2c-2+c>22 3c>24 c>8 if c=10 (greater than 8), then b is b=2c-2=18
October 21, 2014

physics
yes.
October 21, 2014

physics
What is sqrt(50^2+60^2) ? that force=m*a solve for a.
October 21, 2014

Chemistry
write the equation P4O10 + 6H2O>> 4H3PO4 figure the mole of P4O10 you have in 10 g figure the moles of water you have in 12 g You need six moles of water for each mole of P4O10. so which is the limiting reactant (least), moles of P4O10, or six times moles of water? the ...
October 21, 2014

Physics
you are correct
October 21, 2014

Physics
40=1/2 g t^2 solve for t h=1/2 g (t-1.1)^2
October 21, 2014

physics
consider your trig A1 *cos(wt+theta1) + A2 cos(wt+theta2) = A3 * cos(wt+Theta3) where A3^2=(A1cosTheta1 +A2cosTheta2)^2+(A1sinTheta1+A2sinTheta2)^2 and Theta3 is given by arc tan ( (A1SinTheta1+A2SinTheta2)/(A1cosTheta1+A2CosTheta1) )
October 21, 2014

Physics
Initial KE=finalKE + PE at highest point Now, the velocity at the top is only horizontal, or 29.2*cos46.9 final KE=1/2 m (29.2*cos46.9)^2
October 21, 2014

Math
what is 5/6 of 360= 5*60=300
October 21, 2014

Physics
http://www.sparknotes.com/physics/linearmomentum/collisions/section2.rhtml There is just a lot of math to this. review that link outline.
October 21, 2014

please help physics!!!!
force=total mass* acceleration=sumMasses*a calculate a force on cart2=mass2*a
October 21, 2014

Physics
http://www.sparknotes.com/physics/linearmomentum/collisions/section2.rhtml
October 21, 2014

physics
in the vertical h=1/2 g t^2 solve for t
October 21, 2014

Precalculus
The radius of the circle is increasing at a rate of 2.2ft ??? per second, minute, hour? It is kind of important later, as in f) h) i) J) k) area=pi*r^2 d area/dt= 2 PI r dr/dt so depending on the answer to my question above, dr/dt is known. So d area/dt is then known for j, dr...
October 21, 2014

Physics
Formula? You have to do some thinking. draw the diagrem. Calculate the height off ground the swing is at the start position: L=3.27-3.27cos35.6 calculate the starting PEnergy mass*g*startingHeight Calculate velocity from final KE=initial PE 1/2 mv^2=mgh solve for v.
October 21, 2014

Physics
KE=1/2 masstotal*velocity^2
October 21, 2014

Double facts - 2nd Grade
2+2 and if the child knows "take-away one" then the double fact 3+3 can be used.
October 21, 2014

Physics!
find the time t for what event?
October 19, 2014

Math
I wonder what the layout of the floor looks like...
October 19, 2014

chemestry
CaCl2+AgNO3>>2AgCl + .... Ok, you first figure the moles of silver chloride form 2.9grams. Then you had half that number of moles of calcium chloride in solutions, so MolarityCaCl2=molesCaCl2/.025
October 19, 2014

physics
focal length is the reciprocal of 2.00, or 50 cm.
October 19, 2014

Physics fun
find the vertical component of momentum of the ball, double it...think out why..
October 19, 2014

Physics updated
force downward- force upward=mass*change acceleration. force downward you figured in part b due to change in motion. then solve for force upward to do the slowing in part b. now add his weight, which is also supported by the ground.
October 19, 2014

Physics updated
acceleration= (velocity final-velocityinitla)/timeslowing Are you overthinking?
October 19, 2014

Physics updated
the downward force is what you did in b, supposedly. You are looking for gound force. You can figure the acceleration in b.
October 19, 2014

Physics updated
ground force-downwardforce=mass*acceleration acceleration=changevelocity/time
October 19, 2014

College Pysics
I have no idea where the strings are...
October 19, 2014

Writing: Research Paper
You better think this out. You might consider writing on The difference between women and humans, or between apples and fruits Are you considering Christianity not a religion? Think on that for a few minutes.
October 19, 2014

Physics
you "know" tension is 20.2 N? Sum moments about the hinge (m1*g*L/2+m2*g*L-T*L) sinTheta=0 L*g(m1/2+m2)=TL T= g(.751/2+.722) =9.81(1.09)=10.7 did I miss something?
October 19, 2014

Chemistry
find the deltaH per gram NaOH. it must be 1/2 ((149*cwater*5)+11*5) now multiply by the mol mass of NaOH (40).
October 19, 2014

Science Help
a. acceleration=changeinVelocity/time b. a. vf^2=vi^2+2ad solve for d. b. time=(d+23 )/velocity change velocity to m/s first.
October 18, 2014

math
I wonder what the problem is.
October 18, 2014

PHYSICS 1301 (COLLEGE)
Hmmm. Something is missing here.
October 18, 2014

PHYSICS 1301 (COLLEGE)
Vf^2=Vi^2+ 2 ad where a= force/mass=mg*mu/m=mu*g solve for Vf. acceleration is NEGATIVE, of course.
October 18, 2014

PHYSICS 1301 (COLLEGE)
Vf^2=Vi^2+ 2 ad where a= force/mass=mg*mu/m=mu*g solve for Vf
October 18, 2014

science
yes, d.
October 17, 2014

Trigonometry
tanA=mu tan 43 = either c, or d. grab your calculator.
October 17, 2014

calcu
b. 3*g(4) + 1=3*(-3)+1=.... (2,-8) c. -g(1/3(8+4)) +8.... (8,11) check that d 1/2g (-5*x -15) -8 now to make the g(4)=g(-5x-15) then x=-19/5, so (-19/5, -8-3/2) check those, most of it I did in my head.
October 17, 2014

physics
initial KE+initial PE=finalKE+finalPE 1/2 m 19.4^2 + 0 =1/2 m v^2 +mg*3.10 m divides out, solve for v
October 17, 2014

Help- Calulus
1/5=1/7+1/p 7p=5p+35 can you take it from here? Wondering where you got the idea this is calculus.this is hardly prealgebra.
October 17, 2014

Scientific notation. PLZ HELP!
12x10^27
October 17, 2014

CALCULUS
Wondering if you have a name. 2L+2G=108 L=54-G volume=LG^2=G^2(54-G) dv/dg=2G*54-3G^2=0 G=108/3=39 L=54-39=15 check my math
October 17, 2014

Equilibria
wondering what you mean by Kf
October 17, 2014

Calculus
you are given h(t), to you need to take the derivatave of h'(t) and set it to zero. The derivative of height is velocity.
October 17, 2014

physics
horizonal distance=vcos30*time time=40/vcos30 time in air: hf=hi+viSin30*t-4.9t^2 hf, hi is zero. 0=v/2 (40/Vcos30)-4.9(40/vcos30)^2 solve for v.
October 17, 2014

physics laws of motion
What is F=m*a
October 17, 2014

Science Help Urgent!!!!!
yes, electrons in an atom equals the atomic number
October 16, 2014

Creative Writing
Read. Start writing. Read. Proof your writing. Read. Let others you trust and who are honest with you, to proof your works, and critize it. Read. WRite
October 16, 2014

physics
torque=moment of inertia disk*alpha
October 16, 2014

physics
vf=vi+at but a=F/m solve for vf
October 16, 2014

Science
No. Count the offspring . How many have a b in them?
October 15, 2014

Science
br x rr you get br, br, rr, rr
October 15, 2014

Science
The two chromosomes of a pair are called homologous chromosomes.
October 15, 2014

Counseling
There are several models for reflective practice. You need to consult your text. My experience tells me that answer "a" is the best answer to the question, but then again, consult the model in your text.
October 15, 2014

Science
yes, or white flowers with red patches.
October 15, 2014

physics
Sum moments about the edge of the table. D is the distance over the edge d is the distance from the edge to center of mass of the board. 3.05d-4.87D=0 D= 3.05d/4.87 but d= 1.58/2-.32 That does not look like your answer.
October 15, 2014

physics
Ma*Va=-MbVb Valice= - Mb/Ma * Vb for magnitude, ignore the negative sign (direction)
October 15, 2014

Integral Calculus
work=INT force*dx from 0 to .6 = int(k x dx)= 1/2 k x^2 over limits where k= 4lbs/.1f= 20 lbs/ft work= 1/2 k x^2 from zero to x=.6 work= 1/2 (20lbs/ft)*.6^2 ft^2 - 0 = 36 ft-lbs work
October 15, 2014

physics
net force=ma Fgravity-Friction=ma Friction=mg-ma=m(g-a)
October 15, 2014

Science
nope, see other post
October 15, 2014

mechanancs.
a painting with five hangers holding it up, and gravity pulling it down.
October 15, 2014

Science
B.
October 15, 2014

Algebra Help
f(x)=2(x^2+8x) -1 = 2(x^2+4x+4) -1-8 = 2(x+2)^2 -9 sp as x gets large, either negative or positive, f(x) increases, which means at x=-2 it is a minimum.
October 15, 2014

psychology
question 2 is wrong question 5 is wrong
October 15, 2014

Math
A appears not to repeat in a fixed pattern. Irrational.
October 15, 2014

chemistry
10 grams of HCl is how many moles? Calculate that, then the moles of water will be the same, and convert that to grams.
October 15, 2014

planning & implementing for the environment
Nuts. Try C.
October 15, 2014

planning & implementing for the environment
Nope, unless the kid is talking and playing with the shelves. Try independence skills. The kid can browse independently.
October 15, 2014

sight words
I am not certain of the meaning of your qeustion. It depends on the age of the child. I recommend starting with the Dolch set, and later migrate to the Fry set. http://www.sightwords.com/sight-words/flash-cards/
October 15, 2014

physics
joules/second, or in fundamental units Newton*meter/sec or kg*m /sec^2*m/sec = kg*m^2/sec^3 check that.
October 15, 2014

BUS100
The purpose of the approach step of the sales process is to cause the prospective client to come to the understanding that the practitioner is someone with whom he or she may want to do business as a result of the rapport that has been created.
October 15, 2014

program planning
That guy knows his stuff on teaching kids science.... :)
October 15, 2014

program planning
This is about the poorest question I have ever seen on science methods. One has to specify the purpose of the activity, and then what is to be done. Short phrases such is this is meaningless. Six to 12 years, we expect inquiry to be going on, the only inquiry activity really ...
October 15, 2014

Math (Ms. Sue! Someone help)
a. Put in x=-4, and y=10 to see if it is equal on each side 10-5(-4)=? 10 10+20 hmmmm, not equal, so that is not a solution b. each change of one in x gives an increase of 10 in y. It is a linear equation, slope 10
October 15, 2014

HISTORY
a is the best choice.
October 15, 2014

chemistry
Conservation of mass: 40 grams
October 15, 2014

Physics
a. h=vi*time-4.9 t^2 b. initial KE=final PE 1/2 m v^2=mgh v^2=2*9.8*50,000 solve for v.
October 15, 2014

physics
sum these two forces. Then the equilibrant is the negative of that sum
October 15, 2014

AP Giannini
4"/10'=z/12.5' z=4 * (12.5/10)
October 15, 2014

Physics
it means the calculation or data is exactly spot on. Not very normal.
October 14, 2014

Science
There are thousands of them. Turner's syndrome, or http://www.genome.gov/10001204
October 14, 2014

communication
Feedback. If you are being assertive with Ted Cruz, and he pulls out a gun...you back off some due to his behaviour. When assertively shouting at your mom, and she cries, you back off some. Or wish you had later.
October 14, 2014

science/math
yes, correct.
October 14, 2014

science
you can take a sample, volume it, and mass it, or use a hydrometer.
October 14, 2014

Math
no, the simplest whole number form is 7/6 Somehow, some math teachers love integers, but 14:12 is ok, as is 1.1666...:1.0 is also ok.
October 14, 2014

vector mechanics- dynamics
without the diagram....
October 14, 2014

Physics
net force*distance=work net force= work/distance=17.2J/19m= you do it. then the sum of forces equals net force F1+3.93N=net force solve for F1
October 14, 2014

Math
I would send them back to third grade, or at least Larry. I wonder what Gary said. consider this a garden by 24x6 area: 144 perimeter:60 a garden by 12x13 area: 156 perimeter:50 Larrys argument is shot down.
October 14, 2014

3 grade math
angles do not have area....
October 14, 2014

Chemistry
calculate the moles of copper in 1.51grams. You need twice the moles of acid as moles of copper. Volume acid in liters=molesacid/molarityacid = 2*molesCu/molarityacid
October 14, 2014

MATHS
(90/3*3+5)/(-2*3+9)= (90/9+5)/(-6+9)= (10+5)/(3)= 5
October 14, 2014

physics
force friction on coin=mg*mu centripetla force= m w^2 r set them equal. Examle, the inner coin so to stay, the mu can be found.. mg*mu=m w^2 r mu=(33.5*2pi/60)^2*.04 mu=12.3*.04= .49 but the actual coefficient is greater than this, so that xoin stays on the disk. Now do this ...
October 14, 2014

physics
would it be n*mg where n is the coins above it?
October 14, 2014

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