Recent content by reyrey389

Yeah I read it wrong, from what I understand, the blocks were initially pushed towards each other and this was balanced by the spring force, to give a net force of zero, and to keep the blocks at rest. But the forces that oppose the spring force pushing the blocks away, is it only the tension in...

http://faculty.mint.ua.edu/~pleclair/ph125/Misc/exam2_form_a_solns.pdf On page 1, problem 1, where it shows a mass M and another mass 3M connected by a cord and spring. Then the cord is burned off, and then the spring "pushes the blocks away" I get the momentum conservation and how to work the...

That it is zero since |v| doesn't change. So a•v= 0 meaning either the vectors are orthogonal or one of the vectors is the zero vector ?

So d/dt (v • v) = v'•v + v•v' = 2 v•v' but I'm not sure where to go with this, is it that since the two vectors are orthogonal their dot product is thus zero and since this dot product = d/dt |v|^2 then that quantity is also zero , so acceleration is zero?

Hi thanks for the quick response. I 'm not sure where to go with that. I know there's a theorem that says the dot product of a vector with itself is the magnitutde of the vector squared, but I am not sure where I can go with what you said.. But on the other hand, can I also use this formula , a...

Homework Statement What relationship exists between the velocity and acceleration vectors? Prove your claim Homework Equations Since speed = |v| = constant, acceleration_tangential = d|v|/dt = 0. My question is on the "prove your claim part" Can I see simply just say let v(t) = a*i +...

The reason why the work energy theorem " ΣW = Δ KE " only includes kinetic and not potential energy, is because gravity undoes the potential energy ? What I mean by "undoes" here is, If you were to, for e.g., lift an apple up a vertical distance, but also accelerate it while lifting it. Then...

I figured out why I was wrong, not sure how to delete posts, but while this is up I also had another question on a problem a bit more involved. In a stunt being filmed for a movie, a sports car overtakes a truck towing a ramp, drives up and off the ramp, soars into the air, and then lands on...

Homework Statement An airplane with a speed of 70.6 m/s is climbing upward at an angle of 40.0 ° with respect to the horizontal. When the plane's altitude is 814 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point of...

A boy jumps from rest, straight down from the top of a cliff. He falls halfway down to the water below in 0.998 s. How much time passes during his entire trip from the top down to the water? Ignore air resistance. Attempt: t = 0.998 approx 1 sec vo = 0 m/s (v initial) g = -9.8 m/s^2 I solved...

Thanks so much for replying quickly, as this is my first question on here for a while, but i am a complete foreigner to your terminology/explanation. But after Hours of looking up threads here, i somewhat found luck off this thread...

So I know for a mass m with velocity v to travel in a circular motion, there has to be a centripetal force towards the center, but I'm having trouble intuitively visualizing why friction is directed towards the center? The way I see it, is for the car to turn , say left, the wheels rotate to...

ye ur right ionic is stronger, i asked my teacher. also how do you determine reactivity from the lewis structures? like how are alkenes more reactive than alkanes when alkenes contain double bonds? doesnt strong bonds imply less reactivity? thanks

for the reaction ATP + H2O -> ADP + H2PO4- Delta(G^0)= -30.5 kj/mol A)if 0.5 mol of ATP, 1 mol of H2O, 1.5 mol of ADP, and 0.2 mol of H2PO4- are mixed in a 2.2L container at 23C, which direction would the reaction shift to reach equilibrium? I used Delta(G) = Delta(G^0) + RT*ln(Q) I...