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KS
Questions (35)
What is the process of making a web portfolio?
1 answer
404 views
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,
2 answers
727 views
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 %
1 answer
622 views
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
2 answers
560 views
Which molecule ( KI or LiF ) has the higher boiling point?
Select the single most important reason below to justify your choice
3 answers
1,283 views
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
1 answer
1,082 views
A girl is sledding down a slope that is inclined at 30º with respect to the horizontal. The wind is aiding the motion by
3 answers
718 views
The drawing shows a circus clown who weighs 750 N. The coefficient of static friction between the clown’s feet and the ground
2 answers
560 views
A girl is sledding down a slope that is inclined at 30º with respect to the horizontal. The wind is aiding the motion by
5 answers
7,891 views
The drawing shows two frictionless inclines that begin at ground level (h = 0 m) and slope upward at the same angle θ. One
3 answers
1,154 views
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
4 answers
1,806 views
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
4 answers
707 views
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
2 answers
532 views
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
3 answers
636 views
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
2 answers
543 views
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
3 answers
443 views
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
4 answers
3,094 views
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
2 answers
527 views
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
3 answers
757 views
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
1 answer
1,084 views
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
1 answer
559 views
When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of
2 answers
540 views
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
2 answers
612 views
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.
1 answer
481 views
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
2 answers
850 views
The drawing shows an ideal gas confined to a cylinder by a massless piston that is attached to an ideal spring. Outside the
1 answer
801 views
A Goodyear blimp typically contains 5040 m3 of helium (He) at an absolute pressure of 1.10 x 105 Pa. The temperature of the
1 answer
490 views
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.
1 answer
379 views
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
4 answers
596 views
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
3 answers
790 views
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
2 answers
708 views
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
2 answers
537 views
I need help under standing this passage"...[The] said Cooper Hughs Freedman with his wife...are to work on said farm and to
5 answers
2,433 views
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
2 answers
493 views
In "January," what does the speaker mean by the image in the following lines?
The sun a spark Hung thin between The dark and
2 answers
988 views
Answers (58)
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.
is it a or is it c because it says trees black lace so it must be getting dark
sharecropping
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?
for part c the correct answer is the first option
lies!
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
vm = 2.213594362 Q = 0.278168471
23220
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
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
Alright i got it 24)0.558 0.000327
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
try the stereoisomers one q27, looks pretty straightforward.
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
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
B and both glasses will be weaker
"Both molecules are ionic but the higher melting point has a larger cohesive energy"
Dude its wrong again
0.000258
1.8e-6
tetrahedral,2,1,1,no,no
BN,AlAs, C,GaAs,GaP
yes 3.88e-7
1.04e-3 p type
whoops i am so sorry its B
i think the former CaCl2 is A, not sure about Nacl
thanks kim, thanks hil, both your answers are right. Good going!
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.
v^2/(2*g)
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!
Right... I was thinking the same along the lines of light is "quantized". Thanks!
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
Sn
thanks bob it worked!
even after converting to joules we get the same answer 4.835 which is wrong.
@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)
can i have the formula atleast? I just need one more percent to earn the certificate , thank you
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
thanks bw your formula worked for both q1 and merry, thanks so much for sharing with us :)
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
Never mind guys, alphawolfram did it for me :)~ any luck with the last three questions? Today is the deadline!
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
oops I reset it, new value of T is 1091 K somebody help please :'(
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.
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.
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))
whoops, bw got here before me. I was wrong there. cheers sasha, hope we can help each other again in times of need.
k can either be 40 or 80.Thanks mouse and to all that helped. We worked as a team and we nailed it :D
@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
