Friday

September 30, 2016
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*

**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*