# Posts by KS

Total # Posts: 99

**Language Arts**

In "January," what does the speaker mean by the image in the following lines? The sun a spark Hung thin between The dark and dark. Persona of the poem is"John Updike"

**Social studies**

I want to answer that question but i can't understand it. I'm also not really expecting anyone to reply back butt pleas if you do can you make it very detailed so i can understand it.

**Social Studies**

sharecropping

**Social Studies**

I need help under standing this passage"...[The] said Cooper Hughs Freedman with his wife...are to work on said farm and to cultivate forty acres in corn and twenty acres in cotton, to assist in putting that fences on said farm in good order and to keep them so and to do ...

**Chemistry**

The human body is said to contain approximately 50.0 grams of DNA in the entire body. If the number of nucleotides in ONE STRAND of DNA is approximately 3.0 x 106, and the average molar mass of a nucleotide is 327 g/mol, what is the average molar mass of an entire DNA double ...

**Chemistry**

A hot air balloon is filled with hot air and the hot air forces the volume of the balloon to expand until the density of the gas in the balloon is less than the density of the outside air. The volume must be 20% larger than the balloon would be at STP in order for the balloon ...

**Math**

Isaac is packing boxes into a carton that is 12 inches long 18 inches wide and 6 inches high. The boxes are 4 inches long 6 inches wide and 2 inches high. How many boxes will fit inside the carton?

**PHYSICS**

Find the mass of water that vaporizes when 4.04 kg of mercury at 210 °C is added to 0.498 kg of water at 81.6 °C. I am stuck on trying to figure out how to solve this. Please help!

**PHYSICS**

Find the mass of water that vaporizes when 4.04 kg of mercury at 210 °C is added to 0.498 kg of water at 81.6 °C.

**PHYSICS**

A Goodyear blimp typically contains 5040 m3 of helium (He) at an absolute pressure of 1.10 x 105 Pa. The temperature of the helium is 282 K. What is the mass (in kg) of the helium in the blimp?

**PHYSICS**

The drawing shows an ideal gas confined to a cylinder by a massless piston that is attached to an ideal spring. Outside the cylinder is a vacuum. The cross-sectional area of the piston is A = 2.50 × 10-3 m2. The initial pressure, volume, and temperature of the gas are, ...

**PHYSICS**

A thermos contains 152 cm3 of coffee at 93.8 °C. To cool the coffee, you drop two 11.6-g ice cubes into the thermos. The ice cubes are initially at 0 °C and melt completely. What is the final temperature of the coffee in degrees Celsius? Treat the coffee as if it were ...

**PHYSICS**

Find the mass of water that vaporizes when 4.04 kg of mercury at 210 °C is added to 0.498 kg of water at 81.6 °C.

**PHYSICS**

An ice chest at a beach party contains 12 cans of soda at 2.69 °C. Each can of soda has a mass of 0.35 kg and a specific heat capacity of 3800 J/(kg C°). Someone adds a 6.05-kg watermelon at 24.1 °C to the chest. The specific heat capacity of watermelon is nearly ...

**PHYSICS PLEASE HELP**

When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple model of the supernova process, assume that the star is a...

**PHYSICS**

How do I solve this? The blade of a windshield wiper moves through an angle of 90.0° in 0.453 s. The tip of the blade moves on the arc of a circle that has a radius of 0.775 m. What is the magnitude of the centripetal acceleration of the tip of the blade?

**PHYSICS**

How do I solve this? A mine car (mass=380 kg) rolls at a speed of 0.50 m/s on a horizontal track, as the drawing shows. A 170-kg chunk of coal has a speed of 0.92 m/s when it leaves the chute (at a 25 degree incline). Determine the speed of the car–coal system after the ...

**PHYSICS**

How do I solve this? A 700-kg race car can drive around an unbanked turn at a maximum speed of 41 m/s without slipping. The turn has a radius of 190 m. Air flowing over the car's wing exerts a downward-pointing force (called the downforce) of 12000 N on the car. (a) What ...

**PHYSICS**

How do I solve this? For the normal force in the drawing to have the same magnitude at all points on the vertical track, the stunt driver must adjust the speed to be different at different points. Suppose, for example, that the track has a radius of 2.87 m and that the driver ...

**PHYSICS**

How do I solve this? Object A is moving due east, while object B is moving due north. They collide and stick together in a completely inelastic collision. Momentum is conserved. Object A has a mass of mA = 16.6 kg and an initial velocity of nu Overscript bar EndScripts ...

**PHYSICS**

A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -278 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ...

**PHYSICS PLEASE HELP**

A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -278 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ...

**PLEASE HELP**

A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -278 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ...

**PHYSICS**

A 60.8-kg skateboarder starts out with a speed of 1.84 m/s. He does 90.8 J of work on himself by pushing with his feet against the ground. In addition, friction does -278 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ...

**PHYSICS**

A 50.5-g golf ball is driven from the tee with an initial speed of 57.4 m/s and rises to a height of 23.2 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 7.97 m below its highest point?

**PHYSICS**

In attempting to pass the puck to a teammate, a hockey player gives it an initial speed of 1.43 m/s. However, this speed is inadequate to compensate for the kinetic friction between the puck and the ice. As a result, the puck travels only one-half the distance between the ...

**PHYSICS**

The drawing shows two frictionless inclines that begin at ground level (h = 0 m) and slope upward at the same angle θ. One track is longer than the other, however. Identical blocks are projected up each track with the same initial speed v0. On the longer track the block ...

**Physics**

A girl is sledding down a slope that is inclined at 30º with respect to the horizontal. The wind is aiding the motion by providing a steady force of 131 N that is parallel to the motion of the sled. The combined mass of the girl and the sled is 59.9 kg, and the ...

**Physics**

The drawing shows a circus clown who weighs 750 N. The coefficient of static friction between the clown’s feet and the ground is 0.630. He pulls vertically downward on a rope that passes around three pulleys and is tied around his feet. What is the minimum pulling force ...

**Physics**

Okay, I solved for a and came out with a=4.28m/s^2 (thank you!). However, when I plugged it into the formula to solve for time, my answer is still incorrect. Am I using the wrong formula?

**Physics**

A girl is sledding down a slope that is inclined at 30º with respect to the horizontal. The wind is aiding the motion by providing a steady force of 131 N that is parallel to the motion of the sled. The combined mass of the girl and the sled is 59.9 kg, and the ...

**algebra**

Marcus plotted the points (0,0),(6,2),(18,6), and (21,7) on a graph. He wrote an equation for the relationship. Find another ordered pair that could be a solution of Marcus's equation.

**Physics**

An eagle is flying horizontally at 5.8 m/s with a fish in its claws. It accidentally drops the fish. (a) How much time passes before the fish's speed doubles? (b) How much additional time would be required for the speed to double again?

**Language Arts**

Actually it don't listen to me A is right because the trees don't have any leaves cause it's winter so they are looking at the bare branches and that makes them seem like lace and the branches are dark so A is correct.

**Language Arts**

is it a or is it c because it says trees black lace so it must be getting dark

**physics**

2 masses m1 and m2 are connected at ends of in-extensible string that passes over pulley find acceleration and tension in pulley.

**physics (Urgent)!!!!!!!!!!!!!!!!!!!!!!**

for part c the correct answer is the first option

**PHYSICS(help)**

q6)a)x_1=sqrt(2*g*R*m/(m*g*alpha+k)) b) t=pi/(2*sqrt((k+alpha*m*g)/m))) c) The block will move back and get catapulted up the circular track

**Classical mechanics**

lies!

**chemistry**

Hey Dick we are discussing our results here, do tag along. /display.cgi?id=1387456620

**chemistry**

0.000258

**chemistry**

1.8e-6

**chemistry**

B and both glasses will be weaker

**chemistry**

whoops i am so sorry its B

**chemistry**

i think the former CaCl2 is A, not sure about Nacl

**chemistry**

1.04e-3 p type

**chemistry**

yes 3.88e-7

**chemistry**

BN,AlAs, C,GaAs,GaP

**chemistry**

tetrahedral,2,1,1,no,no

**chemistry**

Dude its wrong again

**Solid State Chemistry**

"Both molecules are ionic but the higher melting point has a larger cohesive energy"

**Solid State Chemistry**

Which molecule ( KI or LiF ) has the higher boiling point? Select the single most important reason below to justify your choice should have the higher melting point Both molecules are nonpolar but the higher melting includes hydrogen bonding Both molecules are nonpolar but the...

**Chemistry**

Sn<Ge<Si

**chemistry**

its alright your intentions were good i can see that so your apology is accepted. sorry for being harsh when all you did was trying to help. i met up with someone who got 94 in the finals and he was kind enouigh to give me some answers 26)1, 3, 0.57; 27 (successively) 27)3,4,4...

**chemistry**

for Nb correct answer is 6.89 Volts. Thanks alot ZM for posting the wrong answer. Next time please double check before sharing your results. I tried the steps anonymous posted for K surface energy from bananas but its giving me the wrong result. Anyone else can give a try?

**chemistry**

Alright i got it 24)0.558 0.000327

**chemistry**

Yeah hi. Hil told us that can someone solve the lead solubility and tell us the end result please? Here are the steps: "This is simple Stoichiometry problem Write down PbI2 -> Pb2+ + 2I- Therefore Ksp = [Pb2+][I-]^2 From the stoich you can derive that Ksp = Cs(2Cs)^2...

**chemistry**

try the stereoisomers one q27, looks pretty straightforward.

**chemistry**

I am also telling the answers of those i myself got wrong in my previous tries. 10 a is 2.42e-6 I got it wrong

**chemistry**

Thanks man, i am telling you all i know.. don't worry, if you get more than 60 overall you will receive your certificate (like i did in bio despite failing in the final, they don't mention your score in the certificate) I don't know anything about gold or the ...

**chemistry**

thanks kim, thanks hil, both your answers are right. Good going!

**chemistry**

thanks for 28 it's correct, as for 12, a is yes and b is 3.88e-7 I got them correct. Thanks again. feel free to brainstorm for other questions.

**chemistry**

You are welcome, thanks. I forgot to convert from KJ/mol to J/mol! If you get anything else, pls do share on this page!

**chemistry**

Okay i am going to list down all the answers i got so far, please assist me in those which i left, if you have any: 1)156.675158119 2)5 3)90.1775147929 4)3s,3p,4s,3d,5s,5p,4f 10,2,14,6 5)-777 2.86e-10 6)8.88 dont know what part b is 7)O2, O2-2 8)tetrahedral,2,1,1,no,no 9)LiF ...

**chemistry**

thanks bob it worked!

**chemistry**

Right... I was thinking the same along the lines of light is "quantized". Thanks!

**chemistry**

even after converting to joules we get the same answer 4.835 which is wrong.

**physics**

vm = 2.213594362 Q = 0.278168471

**Physics Classical Mechanics**

@jessica b) Find Mu_s first Mu_s= (m_p/3 + m_l/2) *cotan (theta)/(m_p+m_l) a) Force = Mu_s*g(m_p+m_l)

**Physics Classical Mechanics**

23220

**classical mechanics**

v^2/(2*g)

**Classical Mechanics - Need Help Please**

thanks bw your formula worked for both q1 and merry, thanks so much for sharing with us :)

**Classical Mechanics Physics - Urgent help please**

can i have the formula atleast? I just need one more percent to earn the certificate , thank you

**Classical Mechanics Physics - Urgent help please**

greco can you please solve for my rocket question Consider a rocket in space that ejects burned fuel at a speed of vex= 1.5 km/s with respect to the rocket. The rocket burns 9 % of its mass in 310 s (assume the burn rate is constant). (a) What is the speed v of the rocket ...

**PHYSICS(HELP)**

A yoyo of mass m=1 kg and moment of inertia ICM=0.045 kg m2 consists of two solid disks of radius R=0.3 m, connected by a central spindle of radius r=0.225 m and negligible mass. A light string is coiled around the central spindle. The yoyo is placed upright on a flat rough ...

**Physics**

Consider a rocket in space that ejects burned fuel at a speed of vex= 2.0 km/s with respect to the rocket. The rocket burns 8 % of its mass in 300 s (assume the burn rate is constant). (a) What is the speed v of the rocket after a burn time of 150.0 s? (suppose that the rocket...

**Chemistry**

The Young's modulus for a material is 17.0 x 1010 N/m2. The material is stretched to a strain of 2.0 x 10-3. How much elastic energy will be expended? (Express your answer in J/m3) answer is 340000

**Chemistry**

Never mind guys, alphawolfram did it for me :)~ any luck with the last three questions? Today is the deadline!

**Chemistry**

oops I reset it, new value of T is 1091 K somebody help please :'(

**Chemistry**

Thanks Anon and Drew for the formula, I have other exams to prepare for so this was a life saver, I appreciate it truly. I however do not know how to calculate my result using exponents so can someone please solve for T=1373 K? I would be forever grateful. If I find the ...

**Physics Classical Mechanics**

g*(m_1-mu_k*m_2)/(m_1+ m_2+(I_c/R^2)) g*(m_1-mu_k*m_2)/(m_1+ m_2+(I_c/R^2))*t_1^2/2

**PHYSICS**

q7, the answer is a)2*pi*sqrt(((1/3*m+m)*l^2+1/2*m*R^2)/((1/2*m+m)*g*l)) b)2*pi*sqrt(((1/3*m+m)*l^2)/((1/2*m+m)*g*l)) 4a: (m_2*g)/(m_2+I_c/R^2) b: (I_c*m_2*g)/(m_2*R^2+I_c) c: sqrt((2*h*m_2*g*R^2)/(m_2*R^2+I_c))

**Physics Classical Mechanics**

R=2 m, Ic=9000 kg•m², r₀=1.2 m, m=20 kg, F=200 N, Δt=18 s. I=Ic+2I₀=Ic+2m r₀² = =9000+2•20•1.2²=9057.6 kg•m². M=Iα α=M/I=FR/I =200•2/9057.6 = 0.044 rad/s² ω=α•Δt =0.044•...

**Physics**

whoops, bw got here before me. I was wrong there. cheers sasha, hope we can help each other again in times of need.

**Physics**

k can either be 40 or 80.Thanks mouse and to all that helped. We worked as a team and we nailed it :D

**Physics**

@phy: input your derivated function (it should have an x^3 - x in it. In alphawolfram, write series (then your function, then) point (then x_0 value) and the result will be of the form f=f_0 -k(x-x_0), check your value for f_0 and k in that equation (most likely your f_0 is a ...

**Physics**

mouse how did you get q8.b) x2-x1? i know that for part d the answer is The block will stay at its resting position x2. for q6 d1) h~ is always smaller than h and for d2) t~up<t~dn and t~up<tup. both second options. need help with the other parts

**Physics**

Thanks alot mouse! after reading your hints I managed to learn how to use series in wolfram :) There should have been more directions provided with the question, the textbook description was insufficient! I havent got the spring one either but for the airliner question I have ...

**Physics**

a = (v - v0)/t = (1 m/s - 5 m/s)/(1 s) = -4 m/s^2 F = ma N - mg = ma N = m(a+g) N = (w/g)(a+g) N = w(a/g + 1) N = (500 N)(-4 m/s^2 / 10 m/s^2 + 1) = 300 N

**Physics**

240 for ur values

**physics(help)**

for second part it is m*g*tan theta

**PHYSICS (HELP!!!)**

try x_0 = 3.75. i used alphawolfram to plot the graph

**PHYSICS(HELP)**

try PE=0 as its at infinity

**Finite**

One coin is fair and one is weighted so that Pr[H] = [ 1/4]. You randomly select one of the two coins, and flip it 3 times, noting the result of each flip. What is the expected number of heads?

**world history**

I NEED THE SAME ANSWER. For my world history class.

**math**

Given the information: the sampled population is normally distributed, = 10.4, n = 60, and = 81.2. a. Find the 98% confidence interval for b. Interpret the confidence interval in Where do i begin

**stats**

How large a sample should be taken if the population mean is to be estimated with 99% confidence to within $72? The population has a standard deviation of $800 Please Help, im stuck

**MultiMedia**

What is the process of making a web portfolio?

**Accounting**

I believe that if a person does not have the answer to the question, he or she should not reply. That is a waste of others time and it is also childish.

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