Recent content by ddn87

Homework Statement What is the magnitude of the horizontal A uniform 7.1 m tall aluminum ladder is leaing against a frictionless vertical wall. The ladder has a weight of 227 N. The ladder slips when it makes a 52.0◦ angle with the horizontal floor. Determine the coefficient of static...

THANKS ill try this out

Im beginning to understand this concept a little more... so when I add Earth and the moon's Radii I get the total radius which is in the m1m2/ r^2 part of the problem... the r(from 1-2) is the radius from the 9 kg object to the center of the earth?

then dividing by two?

I believe what you are trying to say is that R is the sum of the two radii?

Homework Statement Compare the gravitational force on a 9 kg mass at the surface of the Earth (with radius 6.4 × 10^6 m and mass 6 × 10^24 kg) with that on the surface of the Moon (with mass 1 /81.3 ME and radius 0.27 RE ). What is the force on the Earth? Answer in units of N...

i only have two more tries left for this problem, thankyou for your help though. i think I am going to my study TA tomorrow.

so does mean i should add the PE to 4992N?

by He i mean... how much work does the person who pulls the fridge up the ramp do?

hmmm but the question asks... how much work does HE perform.

I got that answer wrong is there a component I am forgetting?

Homework Statement Moving a 150kg fridge a 12m ramp with a rise of 2.4m. the mover pulls the ridge up with a constant force of 710 N. the acceleration due to gravity is 9.8 m/s^2 Homework Equations W=Fs F=ma The Attempt at a Solution I found out the angle of the ramp was by...

nm i got the right answer thankyou!

There is an extention to the problem: A constant friction force of 2 Newtons is exerted on the block by the surface find the magnitude of acceleration of the block So I used F=ma where the force i used was 2 and the mass was 3 so id id 2/3 to find the acceleration which is .66666 is this the...

okay so i figured that the change in KE=.5 x m x (vf^2-vi^2) for this problem it would equal 24J