Friday
September 30, 2016

Posts by bobpursley

Total # Posts: 42,053

Physics
tension=mass*v^2/r 5=.170*v^2/1.35 v= sqrt(5*1.35/.170)=6,30 m/s check that with your calculator
September 30, 2016

physics
Prf Damon is correct. Pressure is in Pascals, or N/m^2. I still had you last question in my mind.
September 30, 2016

physics
pressure=force/area=.01kg*9.8N/kg /.02^2 in Newtons.
September 30, 2016

Chemistry
NaHCO3>>Na2CO3+CO3+H2O balance the equation, then proceed. I will be happy to check you work.
September 30, 2016

Pre-Calc
force=kg-m/s^2 which is also called a Newton.
September 30, 2016

pre-calc
G=F*r^2/m1m2 = N-m^2/kg^2 and in terms of fundamental units (N=kg-m/s^2) then G-kg*m^3/(kg^2*s^2)
September 30, 2016

pre-calc
g=F/m=GMe/r^2 G=gr^2/Me convert g from 32ft/s^2 to m/s^2 then convert rearth from miles to meters.
September 30, 2016

Biology
<<Hair type is an interesting case of something called incomplete dominance. What this means is that with hair type, if you have one of each version of the gene, you get a mix of the two or wavy hair. So for hair type, CC gives curly, Cs gives wavy and ss gives straight ...
September 30, 2016

Physic
going upward: hf=22.5*t-4.9t^2 going downward: hf=17-4.9t^2 but hf=hf, and times are same, so 17-4.9t^2=22.5*t-4.9t^2 or t=17/22.5 seconds hf=17-4.9(17/22.5)^2=14.2 ? meters
September 30, 2016

math 6th
What is -7?
September 29, 2016

Physics
avg speed=8.40rpm/2=4.10rpm revolutions=avgspeed*time=4.1*(27sec/60sec) r
September 29, 2016

Physics
a=w^2 r=(2PI/periodinSeconds)^2 * radiusinmeters
September 29, 2016

Organic Chem
mass of molecules, the vapor pressure and viscosity of the transport solvent, temperature
September 29, 2016

Physics- Velocity, Displacement, etc.
relative to ground: 3E+.5W=2.5E relative to momma: 3E+.5W-1E=1.5E
September 29, 2016

Physics
a) What is 4S+2N? b) what is 4S+3S?
September 29, 2016

Science (check my answers)
yes, zygote
September 29, 2016

Physical science
I bet it was 90-42.
September 29, 2016

physics
a=w^2 * r=(2pi/1.2)^2 *1E4
September 28, 2016

math
It seems to me where the SUN is matters. For a height remaining constant, the shadow gets longer as the day progresses. If the Sun is directly overhead, then you have a right triangle: h^2=12^2-11^2=144-121=23 height=sqrt23 ft That is not very high for kite flying, but 12 ft ...
September 28, 2016

Algebra
B.
September 28, 2016

math!!
Law of cosines: a^2=b^2+c^2 -2acCosB =3+10-2sqrt(3*10)*3/sqrt10 =13-6sqrt3 finish it for solving a. check my math.
September 28, 2016

Physics
could it be the net charge on the rod is not zero? Those excess charges attract the paper pieces, as the charges in the paper (an insulator), move, twist, or however, move toward the rod, this creating an attraction with the rod. The paper pieces are being charged by "...
September 28, 2016

Physics
could it be the net charge on the rod is not zero? Those excess charges attract the paper pieces, as the charges in the paper (an insulator), move, twist, or however, move toward the rod, this creating an attraction with the rod. The paper pieces are being charged by "...
September 28, 2016

math
yes, as in like polynomials.
September 28, 2016

physics
=ma first, the elevator. F=m(g+a) 9550=(65+757)(g+a) where g=9.8N/kg solve for acceleration a of the system. Now, knowing a, the scale reading: F=m(g+a) F=65*(9.8+a) put a in that, and f is the scale reading.
September 28, 2016

Chemistry
moles of salt=(29.002-24.330)/159.609 Moles of hydrate:(31.571-29.002)/18 now find the ratio of hydratemoles to salt moles: x=moleshydrate/molessalt
September 28, 2016

Geometry
This question makes no sense. What is m3 mean?
September 28, 2016

algebra
Is this solve for x? 18=x+2 x=18-2=16
September 28, 2016

Social studies
I hope we do not have the ability to see inside your computer, that would be a very unwise thing for you to let folks access.
September 28, 2016

Physics
draw the velocity-time graph. The area below the graph is the distance covered. (area=velocity x time)
September 28, 2016

physics
The sum of heats GAINED is zero. heat Gained=mass*specificeheat*(Tf-Ti) Heatgainedby water + heatgained by lead=0 Mwater*specifhtWater*(Tf-ti)+Masslead*specihtLead*(Tf-Ti)=0 solve.
September 28, 2016

physics
Heat gained=MassAl*specifichtAl*(Tf-Ti) the heat gained is NEGATIVE, so it gave off that heat
September 28, 2016

physics
assuming acceleration is constant avg velocity=.100r/sec theta=avgvelociyt*.720
September 27, 2016

physics
angvelociyt=3.4/radius
September 27, 2016

physics
If you do it in relative speed, it is easy.. relative speed=3.3-1.2=2.1 m/s horizontal distance=2.1cosTheta*time vertical time in air: hf=hi+2.1sin28 t-4.8t^2 0=0+t(2.1sin28-4.8t) t=2.1sun28/4.8 Now put that time in the horiztonal distance, and solve for distance.
September 27, 2016

Chemistry
Nor do I. There must be more to this. What was the absorsbance before diluting?
September 27, 2016

Physics
fired horizontally. That means the horizontal speed at impace=vertical speed. Vertical speed: vf=9.8*3 so launch speed is that. Now, platform height. h=1/2 (9.8)3^2
September 27, 2016

Physics
find the time it takes to fall 13m. then, v=5/time
September 27, 2016

Algebra
(3-2i)(3-2i) applying foil 9-6i-6i+4i^2 9-12i-4 5-12i
September 27, 2016

Physics
distance=sqrt(16+9+0)=5 E=kq rvector/r^3=kq (4/64,3/27,0)
September 27, 2016

physics
time to fall 84m 84=1/2 g t^2 t=sqrt(168/9.8) distance=191*timeabove
September 27, 2016

physics
What is it you do not understand.
September 26, 2016

Physics
hf=hi +vi'*t -1/2 g t^2 hi=hf=0 vi'=23.5sin10, t is given, solve for g.
September 26, 2016

Math
Howlong is the shelf?
September 26, 2016

Algebra 2
what is 64+-3*5.9 ? anything within that range is there.
September 26, 2016

help me damon reiny steve bob plzz
If we had any idea what n, and i was, we might be able to help.
September 26, 2016

Organic Chemistry
If it is not supersaturated when it cools, it will hold .029g for each 10ml. So the question is how many 10 ml do you have for the solution.
September 26, 2016

Math
y=5(-3)=-15 (15,-3) not a solution
September 26, 2016

Physics/math
50.4mi/hr*1hr/3600sec*1609m/mile=? Notice I multiplied by unit factors (unit means one, denominator is equal to numberator), to change units. Study what I wrote above.
September 26, 2016

Functions
Is this true: for each value of the independent variable, is there one and only one value for the dependent variable?
September 26, 2016

Communication skills
"explore"? https://www.brown.edu/academics/college/support/writing-center/writing-tips/elements-essay/elements-essay
September 26, 2016

Physics
consider energy: beginning energy=final energy 1/2 m v1^2=m*3.71*y1 on saturn 1/2 m (1.39v1)^2=m*.264*y2 divide equation 2 by equation 1 1/1.39^2=.264/3.71 * y2/y1 y2=3.71/(.264*1.39^2) * y1 check my math
September 26, 2016

history,college
Yes, that is chapter 2 of Barnett. But he did show what was natural for one could be supernatural to another (ie, the eclipse). You did not address his discussion of types of beings: angelic, demonic, humans, and "dog-heads" (monsters). He later explored the realm of...
September 26, 2016

Physics
h=1/2 (1.62)(5.5)^2
September 26, 2016

Physics
hf=hi+vi*t-4.86t^2 hi=0 hf=-12.7 solve for t. speed: vf=vi-9.8t solve for vf
September 26, 2016

Math
what is 8ft/4min= to?
September 26, 2016

Algebra 1
100km/hr*1mile/1.609km 100/1.609= ??? mile/hr
September 26, 2016

biology ms sue
correct
September 26, 2016

Math
the inverse will be kg of q/dollarcost 1/f(q)=1/(450+.2q)
September 26, 2016

Physicis
In air? theta=arcSin 1/1.5
September 26, 2016

physics
KE=1/2 m v^2=1/2 *45*(1800/600)^2 in Joules
September 26, 2016

physics
GPE=massinKg*9.8N/kg*heightinMeters GPE will be in joules
September 26, 2016

physics
work done+horizontalforce*distance = 30cos53*50 ft lbs power? divide it by 5 seconds. then convert ftlbs/sec to hp
September 26, 2016

physics
E=kq/r^2=kq*(r as a vector)/r(magnitude)^3 E=k(-6E-6)((0,-5,0)/(0,125,0)=(0,6k/25 E-6,0) In this problem it is simple to realize E points toward the origin, (216N/C j) ( I did not check the 216), or (0,216,0)
September 26, 2016

Calculus
The first thing is to develpe a relation between depth and volume In the SPHERICAL CAP (which you can google), Volume = (pi/3)x2(3R - x) R=10cm dV/dt=(PI/3)(6Rx-3x^2) dx/dt you know dv/dt, and dx/dt. Solve for x. Looks like something of a quadratic equation, use the quadratic ...
September 26, 2016

Sigfigs
This can't be answer unless you know how the figure was obtained, and the precision of each of the calculation in accordance with sig figure rules.
September 26, 2016

physics
m=mass g=9.8N/kg a=acceleration t=time in seconds. H=height in meters Put the values in, and calculate Power in watts work in joules
September 26, 2016

physics
work=mgh power=mgh/time
September 26, 2016

Phyics
F=ma I do not know what you mean 2000N is lost against> Net force=mass* acceleration Generated force-friction force=m*a solve for a.
September 26, 2016

Chemistry
volume= .001Liter/drop*2drops/5sec*3600sec/hr*2.5hr
September 26, 2016

Physics
in the vertical: hf=hi+vi'*t-4.0t^2 0=1.7+5.5*sin21*t-4.9t^2 it is a quadratic equation solve for time t. Horizontal distance: distance=5.5cos21*t Lucky kid
September 25, 2016

Science
weight= mass *9.8N/kg mass=8.5kg
September 25, 2016

Physics
for 35.3 seconds distance gazelle=26.2*35.3 meters distance cheeta=29.5*35.3 meters difference= 35.3*(3.3) meters
September 25, 2016

Basic Chemistry
heat energy=mc deltaTemp = 150kg*specificheatwater*(49+273-298) look up specific heat of water, and you have it.
September 25, 2016

Physics
mk is given as .25, the kinetic force of friction constant. Shouldn't the denominator be m1+m2? both are accelerating. Net force=total mass*a
September 25, 2016

science
what is 176*.37? That is the weight. The mass on mars is that number times 2.2 (in kg)
September 25, 2016

Math
what is 84/240 ? Reduce it 42/120 21/60 7/20
September 25, 2016

Physics
Hmmmm. Wondering what exactly is perpendicular at the corner?
September 25, 2016

Physics
On problem per post please. I and few others are going to do your homework. We are here to help you when you are stuck.
September 25, 2016

Business Law-- HELP
true.
September 25, 2016

Physics
and what are your thoughts?
September 24, 2016

math 6th grade
What did he buy?
September 24, 2016

Organic Chemistry
I will be lowered, the glass will form a solution (very similar to the flux used on welding rods).
September 24, 2016

Chem
you want to dilute it 12/.1 or 120 times, which means one part stock solution, 119 parts water. amount of acid: 1/120 * 500ml= you do it.
September 24, 2016

Math
x+3x+5x=36 inches x=4inches
September 24, 2016

Science
momentum=mass*velocity=2000*2/20 kgm/s b. momentum=mass*velocity mass=momentum/velocity
September 24, 2016

Chemistry
Ok, if the dissolving gave off 176kj, that will heat the solution 176kj=1000*4.18*deltaTemp deltTemp=44 C about final temp, add intial temp 25
September 24, 2016

Math
zero is not greater than, nor is zero equal to 4
September 24, 2016

Maths
I will show you three 36 46 16
September 24, 2016

Math
the big side of the arrow is the open side. 6>5 5<6
September 24, 2016

Chemistry
a. correct b. at that rate, you will use .306*8=2.45 Units per shift, so to use up the 20 Unit bottle, it will take 20/2.45=8.16 shifts, or nearly three days.
September 24, 2016

Physics
You will need a MA of 2, so the rope must be twice as long as the hehttps://www.easycalculation.com/engineering/mechanical/simple-machines/mechanical-advantage-pulley.phpight raised.
September 23, 2016

Algebra
What is (12+4)-2?
September 23, 2016

Sociology
<<What were some barriers to radical social change that could have made things better for freed people following the Civil War and Emancipation Proclamation? >> Lack of basic literacy, availability of jobs (in the South), and basic financial literacy. In my view, ...
September 23, 2016

Algebra
hmmm. algebra? Lets do it with calculus, assuming you are taking that Take the derivative dy/dx, which is slope 3. Y=8x^4-7x^2+5x+6 dy/dx=slope=32x^3-14x+5 now put in the point x=-1, and you have the slope. http://mathinsight.org/derivative_power_function
September 22, 2016

science
What is 197-79?
September 22, 2016

physics
vf^2=vi^2+2ad solve for a
September 22, 2016

Chemistry
The sum of the heats gained is zero? (some gain, some lose) HeatgainedbyWater+heatgainedbylead=0 23.4*Cw*(Tf-8.68)+16.6*cpb*(Tf-138)=0 look up the specific heats for water, and lead, then solve for Temp final Tf
September 22, 2016

Math
ABC A+B+C=16 so A=8 B is O, 1, or 2 maybe if C is low enough all are even So B is O, 2, 4,6,or8 8O8 works I can't any others 817 not all even 826 is to large
September 22, 2016

World Geography
I suspect it is referring to some piece of legislation being proposed.
September 22, 2016

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