# Search results

1. ### Organic Chem. Question

If we add br2 / hv to (s)-1,2-dibromobutane. Where would the radical bromine go? The book hints that the product is an optically inactive substance. So I'm guessing that the bromine would go towards the carbon that has the bromine atom on it making 1,2,2-tribromobutane? Would appreciate...
2. ### Parametric Equations (Calc.2)

Homework Statement Parametrize the curve by a pair of differentiable functions x = x(t), y = y(t) with [x '(t)]2 + [y '(t)]2≠0, then determine the tangent line at the origin. y=2x^3 The Attempt at a Solution Honestly I don't really understand what it's asking for. I assume it wants...
3. ### Electrostatic Force of a Triangle

Homework Statement Suppose that the magnitude of the net electrostatic force exerted on the point charge q2 in the figure is 0.65 N . (Figure 1) http://imgur.com/4lZliPq Find the distance D. q1 = 2.1 micro C q2 = 6.3 micro C q3 = -.89 micro C Homework Equations F = k |q1|...
4. ### Drawing Isomers of cyclopentane?

Homework Statement Draw the products of the mono-chlorination reaction of methylcyclopentane. Indicate the minor and major products. Homework Equations The Attempt at a Solution I've tried looking up examples of how to do this problem but can't seem to find any. From what I...
5. ### Naming Organic Compounds

Homework Statement Give an acceptable IUPAC name for these compounds. http://i.imgur.com/tHUpwYK.png The Attempt at a Solution So the question is really on the 2nd problem in the picture but I need to reference the first one for my question. So my original guess on the 2nd problem was...
6. ### Resistance in a series / parallel?

Homework Statement Find the equivalent resistance between points A and B shown in the figure(Figure 1) . Consider R1= 2.2 , R2= 1.0 , R3 = 3.6 , R4= 5.0 , R5= 4.0 , and R6= 7.6 . http://i.imgur.com/EBJmSvk.png Homework Equations For resistors in parallel, 1 / Req = 1/r1 + 1/r2 +...
7. ### Electric Potential of a triangle?

Find the electric potential at point P in the figure. http://i.imgur.com/8FNSoML.png V = kq / r So what I did was calculated the electric potential each force gives on the point P. Vp1 = (8.99e^9) (2.75e^-6) / .625 Vp2 = (8.99e^9)(-1.72e^6) / .625 Vp3 = (8.99e^9) (7.45e^6) /...
8. ### Le Chatelier's Principle Question

Homework Statement Hi there, I'm kinda confused about these two problems. An equilibrium mixture of NO(g), O2 (g) and NO2 (g) is allowed to expand from 1.0 to 2.0 L at a constant temperature. Given that 2 NO (g) + O2 (g) ---> 2 NO2 (g) which of the following statements is correct? (A)...
9. ### Ladder Problem using Torque

Homework Statement A 5 meter long ladder, weighting 200 N rests against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.2 meters away from the wall. The center of mass of the ladder is 2.5 m from it's base, and the coefficient of friction is .20. How far up...
10. ### Torque with pulley question.

Homework Statement A 2.85 kg bucket is attached to a disk-shaped pulley of radius .121 m and mass .742 kg. If the bucket is allowed to fall, what is the linear acceleration, angular acceleration, and how far does it drop in 1.5 seconds. I really only need help with the first part since...
11. ### Ksp, Solubility Question

Homework Statement The Ksp of Al(OH)3 is 1.0 x 10-33. What is the solubility of Al(OH)3 in 0.0010 M Al(NO3)3? Give your answer using scientific notation and to 2 significant figures (i.e., one decimal place). Homework Equations The Attempt at a Solution I can solve easier...
12. ### ICE chart, Equilibrium question

Homework Statement What is the value of Kc for the reaction H2(g) + F2(g) <=> 2HF(g) given that when 0.010 mol H2 and 0.050 mol F2 are added to a 1.00 L container, 0.0125 mol HF is present at equilibrium. Homework Equations The Attempt at a Solution I'm confused about how to set up the...
13. ### Find the work done

Homework Statement In the system shown in the figure, suppose the block has a mass of 2.7kg , the spring has a force constant of 540 n/m , and the coefficient of kinetic friction between the block and the floor is 0.16. Find the work done on the block by the spring and by friction as the...
14. ### Power Equation?

Power Equation?? Homework Statement An ice cube is placed in a microwave oven. Suppose the oven delivers 135 W of power to the ice cube and that it takes 33200 Joules to melt it. How long does it take for the ice cube to melt? Homework Equations P = W / T The Attempt at a Solution Ok so I...
15. ### Incline Plane with Friction

Homework Statement Find the force necessary to start the crate moving, given that the mass of the crate is 32 and the coefficient of static friction between the crate and the floor is 0.58. The angle is 21 degrees below horizontal. Homework Equations The Attempt at a Solution I don't...
16. ### 2D Kinematics Problem

Homework Statement A projectile is shot from the edge of a vertical cliff 60.0meters above the ocean. It has a speed of 100m/s and is fired at an angle of 35 degrees above horizontal. How far from the foot of the vertical cliff does the projectile land. Homework Equations Yf= Yinitial + ViT...
17. ### Kinematic Equation Confusion!

Homework Statement Upton Chuck is riding the Giant Drop at Great America. If Upton free falls for 2.6 seconds, what will be his final velocity and how far will he fall? Homework Equations The Attempt at a Solution Finding V(final)= Vf-Vi = at ---> Vf = (-9.81)(2.6) = 25.5 The...
18. ### Mechanism and Rate Law

Homework Statement The proposed mechanism for a reaction is Cl2 => 2 Cl (Fast) Cl + H2S => HCl + HS (Slow) Cl + HS => HCl + S (Fast) Which of the following would be a rate law for the reaction? The Attempt at a Solution From other questions I've done the rate law for the...
19. ### Kinetic Friction Problem

Homework Statement A child goes down a playground slide with an acceleration of 1.26 m/s^2. Find the coefficient of the kinetic friction between the child and the slide if the slide is inclined at an angle of 33 degrees below horizontal. Homework Equations F=MA Kinetic Friction =...
20. ### Half-life decomposition, find final concentration

Homework Statement In a first order decomposition in which the rate constant is 0.03 sec-1, how much of the compound (in mol/L) is left after 39 sec, if there was 2.00 mol/L at the start? I'm using a few equations and trying to plug it in but I don't know whether they are appropriate or not...
21. ### Confusing regarding Kinematic Equations

"A 93kg water skier floating in a lake is pulled from rest to a speed of 13 m/s in a distance of 20m. What is the net force exerted on the skier, assuming his velocity is constant. So I know I have to find the force I'm going to need acceleration, and to find it I'll need to use a kinematic...
22. ### Rault's Law, Finding Mass of an unknown.

Homework Statement When 10.7 g of an unknown, non-volatile, non-electrolyte, X was dissolved in 100. g of water, the vapor pressure of the solvent decreased from 23.8 torr to 23.6 torr at 298 K. Calculate the molar mass of the solute, X. Homework Equations The answer is 227, but I know I'm...
23. ### Express Sum of Vectors

Homework Statement Referring to the vectors in the figure, express the sum A + B + C in unit vector notation. http://i.imgur.com/ajMkK.png Homework Equations I'm not sure if it wants me to add Dy, I've tried it both times and masteringphysics won't take either answer. The Attempt at a...
24. ### Trig Question, Find x-intercepts

Homework Statement List all x-intercepts for y= -5sin(4x+pi/3) On the interval [-pi/6, pi/2) Homework Equations I know that y=sin has x-intercepts at 0, pi, and 2pi on the interval of [0, 2pi] but when I try to solve it the same way here it doesn't really come out the same...
25. ### Adding scientific notation question =)

Homework Statement Add (9.8x10^3s)+(9.9x10^4s)+(0.017x10^6s) Homework Equations None The Attempt at a Solution I have entered 125800, as well as 1.26x10^5 but the website marked both of those wrong. I've done this problem every way you could do it I think and it comes out to the same answer...