Recent content by paxian

Thanks so much! You're so helpful! Have a wonderful day :)

Thank you so much.. NOw it makes sense why they thro that coefficient of K in there. soFriction the only force working against the newspaper at that phase?! net force=ma = - Friction force = ma - (coefficient k * m* g) = ma a = -3.92 vf^2 = vi^2 + 2a delta x x= 28.7m? the distance from...

Homework Statement Julia is delivering newspapers. Suppose she is driving at 15 m/s along a straight road and wants to drop a paper out the window from a height of 1.00m so it slides along the shoulder and comes to rest in the customer's driveway. At what horizontal distance before the...

Homework Statement How was energy lost while using the ballistic pendulum? Homework Equations Initial KE= 1/2mb*Vb^2 = 0.929J Final Potential graviational = (m+M)gh= 0.198J Energy loss = 0.929J - 0.198J= 0.731J The Attempt at a Solution I think the answer is: energy lost dues to...

I looked at the right answer... there is part b to this question and that part is consistent with my answer from the back of the book!

Homework Statement Jennifer lifts a 2.5 kg carton of cat litter from the floor to a height of 0.75 m. (a) How much total work is done on the carton during this operation? Homework Equations Work=PE=mg.y The Attempt at a Solution Work = 2.5kg*9.8m/s^2*0.57m= 18.4J However the...

Thank you!

Homework Statement A horse located 8.0m from the central axis of a rotating carousel moves at a speed of 6.0 m/s. The horse is at a fixed height (it does not move up or down). What is the net force acting on a child seated on this horse? The child weight is 130N. Homework Equations...

I understand the logic behind it now! Thanks so much for your help!

Fx= Fstatic - Fkinetic = 0.4*5kg*9.8m/s^2-.15*5kg*9.8m/s^2=12.25N... I found the answer...but why do we have to subtract kinetic friction from static friction?

Homework Statement The coefficient of static friction between a block and a horizontal floor is 0.40, while the coefficient of kinetic friction is 0.15. The mass of the block is 5.0 kg. If a horizontal force is slowly increased until it is barely enough to make the block start moving, what is...

After I draw the FBD...The Tension will now have x and y components when the string angle changes. Ff and N stay the same. If the string is leveled, it only has one component x (horizontal component). You also helped me to answer one of my other lab questions. The coefficient of...

Thanks so much for your quick responses! The normal force would be smaller if the string is level? Friction force acts parallel to the plane of interface. If the string is not leveled, the coefficient of friction is a lot smaller??

Homework Statement In a friction lab to determine the static and kinetic coefficient of friction, there is a block on a flat slope attached to a string which pulled down by a hanging mass. The lab question is: Why is it important to make sure that the string attached to the block is level...