# Posts by Kelsey

Total # Posts: 596

Precalculus check answers help!
1.) Find an expression equivalent to sec theta sin theta cot theta csc theta. tan theta csc theta sec theta ~ sin theta 2.) Find an expression equivalent to cos theta/sin theta . tan theta cot theta ~ sec theta csc theta 3.) Simplify (tan^2 theta + 1)/(tan^2 theta) . csc2 ...

Calculus!
Which is the standard form of the equation with p = 26, O=3pi/4 ? the O before the =3pi has a diagonal slash through it.

Analytic Geometry
Given two planes, discuss the methods used to determine if the planes are parallel, perpendicular, coincident, or none of these.

Physics
The grindstone, in the shape of a solid cylinder, weighs 80.0 kg, and has a radius of 0.320 m. The coefficient of friction between the axe and the stone is mk = 0.620 m. The radial component of the force of the axe against the grindstone is closest to...

Physics
The grindstone weighs 80.0 kg, and has a radius of 0.320 m. The coefficient of friction between the axe and the stone is mk = 0.620 m. The radial component of the force of the axe against the grindstone is closest to...

English
is a i think that's it

since 17 has were in it that would make it subjunctive right?

sorry last c wasn't suposed to be there 16=b 17=a 19=c ?

15. Which of the following sentences uses the passive voice? Almost every night Frances sang her son the same lovely lullaby. Because of the light color, Jason gave the room a second coat of paint. Have you ever been taken to the state fair? Despite her talent, Ms. O’Neil...

Calculus Graph help!!!
its not that its the graph and i have to figure out the equation... but it wont let me post the picture of the graph.

Calculus Graph help!!!
I need help with a calulus graph and figuring out its equation but it wont let me post the picture of the graphs here. so will someone who understands Calculus and their graphs super well please email me k m k underscore horse lover at hot mail dot com. no spaces and an actual...

Algebra 2
If an object is thrown vertically upward with an initial velocity of v, from an original position of s, the height h at any time t is given by: h=-16t^2+vt+s(where h and s are in ft, t is in seconds and v is in ft/sec) A package is thrown downward with an initial velocity of -...

Homework
The formula for the volume of a cylinder is: V=πr^2*h If the volume is 432 cubic inches and the height is 8 inches, solve for the length of the radius. Round answer to 2 decimals.

Math
Hi! Can you help me with this problem please? thank youu :D The problem is: The figure consists of a square with 4 half circles surrounding it. If the perimeter of the figure is 87 yards, what is the radius of each half circle? What is the area of the square? Round to the ...

AP Calculus
Let R be the region bounded by the x-axis and the graph of y=6x-x^2 Find the volume of the solid generated when R is revolved around the y-axis

Chemistry
I need help ASAP! Colligative Properties- Ethylene glycol (C2H6O2) is the principal ingredient in antifreeze. How many grams of ethylene glycol will be needed to lower the freezing point of 2100 grams of water by 20 degrees celcius?

math
write an equation of an ellipse: Major axis 12 units long and parallel to the y-axis, Minor axis 8 units long, center at (-2,5)

physics
a person attaches a 25kg hay bale to one end of a rope passing over a frictionless pulley connected to a beam in the hay barn. another person then pulls down on the opposite end of the rope with a force of 277-N Ignoring the mass of the rope what will be the magnitude and ...

DrBob222
Everything is right except the system...i put -253.5 and it marked me wrong :(

DrBob222
also I checked this problem and I only got the deltaS(surr)=466.4 J/mol*K correct. Please help

DrBob222
chemistry - Kelsey, Thursday, March 15, 2012 at 1:16am My answer is: deltaS(sys)=654900J/mol*K deltaS(surr)=466.4 J/mol*K deltaS(univ)=655366J/mol*K Sorry I forgot to convert to J also I checked this problem and I only got thedeltaS(surr)=466.4 J/mol*K correct. Please help

DrBob222
I know I posted this but you didn't answer! Please help!!!! Consider the following reaction at 298 K: C(graphite) +2Cl2 (g) -----> CCl4(l) Calculate the following quantities. Delta H: -139 kJ/mol deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K My ...

Chemistry
Yes it is correct! Thanks! :) I see my mistake!

Chemistry
Consider the decomposition of a metal oxide to its elements, where M represents a generic metal. M203(s)---> 2M(s) + 3/2 O2(g) info given for Gf(kJ/mol): M203= -10.60 M(s)=0 O2(g)= 0 1.) what is the standard change in Gibbs energy for rxn as written in forward direction? (...

chemistry
My answer is: deltaS(sys)=654900J/mol*K deltaS(surr)=466.4 J/mol*K deltaS(univ)=655366J/mol*K Sorry I forgot to convert to J also I checked this problem and I only got thedeltaS(surr)=466.4 J/mol*K correct. Please help

chemistry

chemistry
Also I don't know how you are working this problem out.

chemistry
So what are the answers for deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K I need to verify the correct answers. Could you please tell me...Thanks!

chemistry
Consider the following reaction at 298 K: C(graphite) +2Cl2 (g) -----> CCl4(l) Calculate the following quantities. Delta H: -139 kJ/mol deltaS(sys)=? J/mol*K deltaS(surr)=? J/mol*K deltaS(univ)=? J/mol*K My answer is: deltaS(sys)=654.9J/mol*K deltaS(surr)=0.4664 J/mol*K ...

Physics
A 2.95 kg block on a horizontal floor is attached to a horizontal spring that is initially compressed 0.0330 m. The spring has force constant 900 N/m. The coefficient of kinetic friction between the floor and the block is 0.42 . The block and spring are released from rest and ...

Physics
A baseball is thrown from the roof of a 22.3 m tall building with an initial velocity of 13.1 m/s and is directed 50.9 degrees above the horizontal. A)What is the speed of the ball just before it strikes the ground? B)What is the answer for part A) if the initial velocity was ...

math
Express this ratio as a unit rate \$2.40 per dozen

math
1 -1/6

math
A contactor is making preparations to re-tile the border around a swimming pool. The pool measures 60 feet by 30 feet. The border extends 1 foot from each side of the edge of the pool. The contractor is going to use that are 0.25 feet squared. A case of tiles contains 50 tiles...

math
How many people would it take to produce a human pyramid 12m tall? Give various methods

new american gov't 2
Over time, _____ has gained power at the expense of

Geometry
the angle of depression from D to F measures 40 degrees. If EF= 14 yd, find DE. round answer to nearest 10th

math
John wants to put a lace edge around a square piece of cloth. If the cloth is 4 inches wide on one side, how long of a piece of lace should Melina cut?

physics
14

Chemistry
Use your value for the heat of neutralization, ∆H, -9490, to determine the amount of heat evolved when 10.00mL of 0.4091 M HCL reacts with 10.00mL of 0.4037 M NaOH.

Chemistry
yes, Al3+ sorry. so the moles=.01380. Could you help with the equation?

Chemistry
0.3724 g x 26.98MW = 10.05 mol -538.4kJ x 10.05 mol = -5410 kJ/mol 5410 kJ/mol of heat is evolved?????

Chemistry
The standard enthalpy of formation of Al3-(aq) is -538.4kJ/mol. How much heat is evolved when 0.3724 g of Al(s) reacts with excess hydrochloric acid?

physical science
Brad rides his bike 20 km. He covers the distance in 45 minutes (0.75 hours). What is his speed in kilometers per hour? A.44 km/hr B.15 km/hr C.9.0 km/hr D.27 km/hr

Calculus
find the second derivative of f(x)=3/(x^2+12)

pre-algebra
when rounding to the nearest cent does it have to be to right or left or does it matter?

math
Ryan takes 12 minutes to rake up and bag a pile of leaves. His sister Kareesa takes twice as long. How many minutes would it take both of them working together to complete 10 bags of leaves

math
What does a boy who likes to play with switches do?

math
12 tablespoons cause 16/4=4 so, 4x3=12!

math
sqrt(75)=sqrt(25)sqrt(3) which simplifies to 5 times sqrt(3) so 6x5xsqrt(3)= 30 sqrt(3)

Calculus
Given f"(x)=-25sin(5x)and f'(0)=0 and f(0)=4. Find f(pi/2)

math
30/40=.75 .75x100= 75 percent

Physics
A solid cylindrical disk has a radius of 0.18 m. It is mounted to an axle that is perpendicular to the circular end of the disk at its center. When a 40-N force is applied tangentially to the disk, perpendicular to the radius, the disk acquires an angular acceleration of 90 ...

Geometry
draw a picture, hint its more then 10 but less then 16

Physics
planet orbits a star once every 2.84 10^7 s in a nearly circular orbit of radius 1.42 10^11 m. (a) With respect to the star, determine the angular speed of the planet. (b) With respect to the star, determine the tangential speed of the planet. (c) With respect to the star, ...

math
3 feet in a yard 12 inches in a foot. 12x3x10=360 360/10=36 tiles

geometry
3 feet in a yard 12 inches in a foot. 12x3x10=360 360/10=36 tiles

Algebra
-9+3x=??? if you still need help let me know

Algebra
4-12x=??

algebra
-21+3x

algebra
27-2x

algerbra
ride=.40+.15x

Physics
Two children hang by their hands from the same tree branch. The branch is straight, and grows out from the tree trunk at an angle of 27.3° above the horizontal. One child, with a mass of 40.8 kg, is hanging 1.24 m along the branch from the tree trunk. The other child, with...

SOCIAL STUDIES
Harvard?

Science
A is wrong because they could have more or less children. C is wrong because it is impossible to have an aa child with the genotypes of the parents. And D is wrong because A is wrong. If you draw out the punett square you would see that B is correct

Physics
Disregard. I figured it out

Physics
The shaft of a pump starts from rest and has an angular acceleration of 3.40 rad/s2 for 11.0 s. (a) At the end of this interval, what is the shaft's angular speed? rad/s (b) What is the angle through which the shaft has turned

physics
A 220 N crate is pushed along the ground with a horizontal force. The coefficient of kinetic friction is 0.21 and the coefficient of static friction is 0.31. The crate moves at a constant speed of 4.1 m/s. a) Draw a free-body diagram for the crate. b) What is the size of the ...

math
13

Algebra
a^2+b^2=C^2 x^2+(x+1)^2=5^2 the other legs are 3ft and 4ft

Algebra 1 (HELP PLEASE!!)
5/3 x 3= 15/3 or 5 cups

it takes 5 minutes to make 2 cuts to give you 3 pieces. so if you continue at a rate of two cuts per 5 minute and in order to get 9 pieces you need 8 cuts. so I think 20 minutes

Algebra 1
Kim weighed 6.5lbs which is the same as 2/3t+3. so 6.5=3+2/3t 3.5=2/3t t=5.25

science
chloride is a form of chlorine

science
both

physics
I figured it out. the velocity of the recoil is in the negative direction.

physics
no that is not a problem. I just have to put in the number. the label is provided.

physics
The lead female character in the movie Diamonds Are Forever is standing at the edge of an offshore oil rig. As she fires a gun, she is driven back over the edge and into the sea. Suppose the mass of a bullet is 0.012 kg, and its velocity is +715 m/s. Her mass (including the ...

physics
Thanks. I was messing up the change in velocity part

physics
a baseball (m = 153 g) approaches a bat horizontally at a speed of 41.0 m/s (92 mi/h) and is hit straight back at a speed of 45.8 m/s (102 mi/h). If the ball is in contact with the bat for a time of 1.05 ms, what is the average force exerted on the ball by the bat? Neglect the...

math
bayside=5 lincoln x+1 hendricks=x band 20=5+x+x+1 20=2x+6 14=2x 7=x so hendricks has 7 and lincoln has 8

Health, Safety, and Nutrition
There are 9 calories in a gram of fat. 9x9=81 calories. 81/115=70.4%. C is the correct answer

math algerba
½(y-2)+2 =3/8(3y-4) Is 4 a solution?

algebra 2
49=x+(x+9)+(x+4) 49=3x+13 36=3x 12+x so one side is 12cm, on is 16cm and one is 21cm

physics
force=G(m1m2/r^2) G=6.673x10^-11

Science
work=force*distance work=800N*100m

Math
draw out the picture of the trapezoid. Since it is a regular trapezoid the bottom angles on both sides are the same. If you draw imaginary lines from the top to the bottom you can form a figure composed of two triangles and 1 square in the middle. You can then use some right ...

Math
a=P(1+(r/n))^nt

Math
semiannual means twice a year. so 2*5=10

Algebra 1
yes

Basic math
median is the middle number. so put the numbers in descending or ascending order and find the middle number. It would be 1,700

SCIENCE
They are "renewable" resources, and less polluting

physics
disregard. I figured it out

physics
A projectile of mass 0.550 kg is shot straight up with an initial speed of 22.0 m/s. (a) How high would it go if there were no air friction? I get 24.7m for this. (b)If the projectile rises to a maximum height of only 13.6 m, determine the magnitude of the average force due to...

Math
Yes you would multiply this. And assuming the tank is empty that is the correct answer

physical science
mechanical energy is the sum of kinetic and potential energy. there fore the one who says that there is mechanical energy is correct. Because there is potential energy present

math
a=Pe^rt a=25000e^(.0575)(7.5)

math (calculus)
A rectangular sheet of paper of width a and length b, where 0<a<b, is folded by taking one corner of the sheet and placing it at point P on the opposite long side of the sheet. The fold is flatened to form a crease across the sheet. Assuming that the fold is made that ...

PHYSICS
An object is originally moving at 13 m/s at the top of a frictionless, quarter-circular ramp with a radius of R = 13 meters. It then travels on a frictionless horizontal surface, around a frictionless loop of radius r = 2 meters, across another horizontal, frictionless surface...

PHYSICS
An object is thrown straight upwards from the ground at 28 m/s. Due to air resistance (a non-conservative force), the object loses 31.4 percent of its initial energy during its trip to reach maximum height. How much higher does the object travel if there was no air resistance...

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