# Recent content by komarxian

1. ### Multivariable calculus problem

Homework Statement Find the points on the surface xy^2z^3=2 that are closest to the origin Homework Equations The Attempt at a Solution x,y,z=/= 0, as when x,y,z = 0 it is untrue. Right?? Otherwise, I am very unsure as to how to approach this problem. Should I be taking partial derivatives...
2. ### SHM - Planet Problem

Homework Statement You are exploring a newly discovered planet. The radius of the planet is 7.20 * 107 m. You suspend a lead weight from the lower end of a light string that is 4.00 m long and has mass 0.0280 kg. You measure that it takes 0.0685 s for a transverse pulse to travel from the...
3. ### Differential Equations: Solve the following

Homework Statement Solve the following differential equations/initial value problems: (cosx) y' + (sinx) y = sin2x Homework Equations I've been attempting to use the trig ID sin2x = 2sinxcosx. I am also trying to solve this problem by using p(x)/P(x) and Q(x) The Attempt at a Solution...
4. ### Differential Equations, solve the following: y^(4) - y'' - 2y' +2y = 0

Thank you!! I get it now; gotta work on the algebra XD I've got 99 problems and it's all algebra pretty much.

Thank you!
6. ### Differential Equations, solve the following: y^(4) - y'' - 2y' +2y = 0

Homework Statement Solve the following differential equations/initial value problem: y^(4) - y'' - 2y' +2y = 0 Hint: e^-x sinx is a solution Homework Equations I was attempting to solve this problem by using a characteristic equation. The Attempt at a Solution y'''' -y'' -2y' + 2y = 0 -->...
7. ### Chemistry: Heat of Sublimation and Hydrogem Bonds Problem

of the reaction H20 (g) + HOH (g) -> H2O --- HOH (in ice)
8. ### Chemistry: Heat of Sublimation and Hydrogem Bonds Problem

I believe it's -21 kJ/mol
9. ### Chemistry: Heat of Sublimation and Hydrogem Bonds Problem

Homework Statement Using the heats of fusion and vaporization for water, calculate the change in enthalpy for the sublimation of water: H2O(s) --> H2O(g Using the delta H value given in Exercise 24 and the number of hydrogen bonds formed to each water molecule, estimate what portion of the...
10. ### Electrical Force Problem

OH! Thank you so much. I got the right answer. A proton is q = +1.6 x 10-19 C. Now I know that for in the future.
11. ### Electrical Force Problem

Homework Statement An alpha particle (charge equals +2e) is sent at high speed toward a gold nucleus (charge equals +79e). What is the electrical force acting on the alpha particle when it is (2.0 x 10-14) m from the gold nucleus? Homework Equations I tried using Coulomb's law, which is E =...

13. ### Rollercoasters and Loops and Normal Forces

Homework Statement <I will attach a diagram below> In terms of m, g and r. FInd the normal force at the top of the loop. Homework Equations ∑F = Fc = FN+Fg ∴ Fc=FN+Fg ∴FN = Fc - Fg ∴ N=mV2/r - mg The Attempt at a Solution Fc=mV2/r - mg and V2=ra and a=g ∴C=mrg/r ∴C = mg ∴mg-mg=N ∴ N=0 N. BUT...
14. ### Elastic Collision on a Frictionless Track

The top is the image that goes with the problem. Below is my work.
15. ### Elastic Collision on a Frictionless Track

Homework Statement Consider a frictionless track as shown (I will attach an image in a follow up post). A block of mass M1= 5.00 kg is released from point A. It makes a head-on elastic collision at B with a block of mass m2 = 10 kg that is initially at rest. Calculate the maximum height to...