KS

This page lists questions and answers that were posted by visitors named KS.

Questions

The following questions were asked by visitors named KS.

What is the process of making a web portfolio?

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?

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 molecule...

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...

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...

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 t...

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 s...

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?

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...

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?

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!

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?

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...

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 t...

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.

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"

Answers

The following answers were posted by visitors named KS.

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.

240 for ur values

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

try PE=0 as its at infinity

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

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 air...

for second part it is m*g*tan theta

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

@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...

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

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

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))

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•18=0.792=0.8 rad/s P=Fv=P ωR = 200•0.8•2 = 320 W. KE=Iω²/2 = 9057.6•0.8²/2 = 2898.4 J.

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...

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

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

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

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

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

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 spee...

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

@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)

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

thanks bob it worked!

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)tetrahedr...

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

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!

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.

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

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

whoops i am so sorry its B

BN,AlAs, C,GaAs,GaP

tetrahedral,2,1,1,no,no

Dude its wrong again

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

B and both glasses will be weaker

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...

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

try the stereoisomers one q27, looks pretty straightforward.

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...

Alright i got it 24)0.558 0.000327

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 el...

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 (...

vm = 2.213594362 Q = 0.278168471

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

for part c the correct answer is the first option

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?

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

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.