Recent content by Alpha123

I don't know what that means, we haven't learned it in class.

Homework Statement I did a lab on the experimental application of Hess's law. There were two experiments where a substance in a solution was dissolved and the temperatures were recorded. Then the standard heat of formation for the substance was calculated. The first experiment used MgO and HCL...

Homework Statement There is a plane flying at 200 km/h and wants to drop a bomb on a car traveling 130 km/h which is 78.0m below the plane. at what angle should the bomb be released? the answer is 45 degrees. Homework Equations sine law: SinA/a= SinB/b cosine law: a^2=b^2+c^2+bcCosA v=d/t...

the answers were difumaric acid, disuccini acid and trimethyl citrate. Thanks for your help everyone !

Homework Statement what are the esters formed by: -fumaricacid and propanol? - succinic acid and butanol -citric acid and methanol and how does each one smell Homework Equations none The Attempt at a Solution I have drawn out each of the structural diagrams but i couldn't draw the esters. My...

thank you ! I understood it .

the correct answer is 20

Homework Statement Particle X moves with a velocity of 15 m/s[R]. Particle Y moves with a velocity of 5.0 m/s[L]. What is the velocity of particle X with reference to particle Y? The correct answer is 20 m/s (R). I do not understand what velocity in reference to particle Y means, and how to...

all right got it. so if this was a test question i would need to show the F=ma part? Thanks a lot for your help :)

also since i found Ffs= - 4.9 m should i put it into F=ma? 4.9m= ma a= 4.9m/m and that way m gets canceled out?

Ffs=UFn =0.5(9.8m) =4.9m i first found the frictional force and then i changed it to the acceleration a= -4.9 m/s^2 then i plugged it into the first relevant equation v2^2-v1^2/2a=d 0^2-15.278^2/(2 x -4.9)=d d= 23.8 m is this the correct way to do it?

how would i find acceleration without the time? and by using an unknown m do you mean Us= Ffs/ 9.8 x m ?

Homework Statement A tree is being transported on a flatbed trailer by a landscaper. If the base of the tree slides on the trailer, the tree will fall over and be damaged. If the coefficient of static friction between the trailer and the tree is 0.5, what is the minimum stopping distance of the...