Recent content by Sall1230

Homework Statement Let A= 3i - 6j and B= 4i - 5j. The direction of the vector C = A - B is at an angle of? Homework Equations Magnitude= ( a^2 + b^2 ) ^1/2 Tan^-1 = b/a The Attempt at a Solution A-B = 3-4 i -6--5j -1i -1j Tan^-1 = -1/-1 = 45 45+180 = 225 Is this correct?

I was doing the wrong law for this equation. mg sin 60 - Fk = ma 1000*9.8*sin60 - ( 0.1 * 1000*9.8*cos60)= 1000a 8487.07-490=1000a 7997.04/1000 = 40m/s

Homework Statement As shown in the figure, ( a mass sliding down an incline of 60°) a car of 1000 kg mass start from the rest, it's velocity after 5s is? ( the kinetic fraction coefficient 0.1) Homework Equations E1=E2 K1+U1=K2+U2 E1+Wf=E2 The Attempt at a Solution -Fk= mg cos 60 (0.1) =...

Hydrogen bond is stronger and it applies to alcohols. So, does that mean that alcohols always have higher boiling points than ketones/aldehydes regardless of their molecular weight? However, if an alcohol has branching and the ketone does not, then the alcohol will have lower boiling points...

I know the dipol-dipol attraction which is between carbon and oxygen and the Hydrogen bond which is as a result of unshared pare of electrons and the hydrogen.

Homework Statement Which one of these had the highest boiling point? A. 3-Pentanone B. 1-Butanol C. Butanal Homework EquationsThe Attempt at a Solution The answer should be 3-pentanone because 1- it's molecular weight is approx 76 compared to the other which has approx 64 2 - because of the...

Ok so: v2^2 - v1^2 = 40 A1 v1 = A2 v2 (10*10^-2)^2 v1 = ( 5*10^-2)^2 v2 0.01 v1 = 0.025 v2 v2 = 4 v1 Putting it in the equation v2^2 - v1^2 = 40 (4v1)^2 - v1^2 = 40 16v1^2 - v1^2 = 40 15v1^2 = 40 v1^2 = 40/15 v1= 1.632 m/s Q= Av Q= (10*10^-2)^2 * 3.14 * 1.632 Q= 0.0512 kg/m^3 Is my...

Homework Statement " A horizontal water pipe has a radius of 10 cm and a pressure of 8*10^4 Pa at one end. At the other end the radius is 5 cm and the pressure is 6*10^4 Pa. What is the water flow rate through this pipe? Homework Equations P1 + 0.5 * ρ * v1^2 + h1ρg = P2 + 0.5 * ρ * v2^2 +...

Homework Statement " A converging lens has a focal length f. The object location at magnification equal to -1 is? " Homework Equations m = -S'/S The Attempt at a Solution Here is my solution: M= -1 , S=?? M= -S'/S -1 = -S'/S S= -S'/-1 S=S' And from case 2 that says if an object is placed...

Homework Statement " A water filled verticle pipe of cross section area 25 cm^2 is open at the top. If an outlet of cross section area 15 cm^2 is made on it's side at a depth of 10 m from the level of the water at the top, then the velocity of the water exiting from the outlet is? Homework...