Recent content by NoHeart

yep yeah...i knew i couldn't be *that* stupid to be so baffled by the question...thanks anyway!

This isn't homework, but it's a question: if an 80 ft. wave approaches shore at 800 miles per hour, and the shore is 82 ft. above sea level, how far will the wave travel across land? My mom lives in California and has become obsessed with this earthquake that will allegedly happen tomorrow...

how can 30,000 kg of snow at 0 C have more heat energy than 1 mL of water at 100 C?

I'm having a problem with just one question on this week's physics quiz- a pendulum with length 2m on a moon oscillates 10 times in 32 seconds, what is the gravity on this moon? i know (or thought i knew) how to get the answer to this, with the simple formula g=4pi^2L/T^2 10 oscillations...

seriously, anyone?

1/4! i love you! and i wish it were only the quizzes that are online, but it's the whole class- the online "lectures" are simply outlines of the chapters in the book, and the book is completely useless when it comes to the quizzes and tests. i have been teaching myself all of the concepts...

i understand 4 of the 6 problems on this week's online physics quiz, but this one is driving me completely NUTS! a diver rotates at 1 revolution per second in the stretched out position. when the diver tucks her head in and bends her legs, assume her length is shortened by 1/2. what is her...

thank you very much for all of your help. is the moment arm of the applied force then the line coming from the center of the board to a point on the line of force, perpendicular to the line of force? this would make the moment arm 0.5ft (sin 30*1ft) that would make the answer 25 lb if it is...

sorry about my manic posting here, but if my brain is working properly then the moment arm of the force acting downward is 1 ft and the moment arm of the applied force is 2 ft. that would make the magnitude of the applied force 100 lbs. please make my brain stop spinning

if the moment arm is 1, then the applied force would be 50 lbs as well, but don't i need to figure the 30 degrees in somewhere?

since the weight is from the center of gravity, would the moment arms be 1 ft, not 2?

okay I'm starting to get it- so if the force downward is 50 lb, then the torque of the force applied will equal the torque of the force downward, because it is at equilibrium? yes?

the height is not given, only the things i mentioned are given. no numerical values of anything. so if i find the relative translational kinetic energies, the one with the highest is the correct answer?

friction is not mentioned at all the force is applied at an angle of 30 upward from the end of the board, just like older dan's rope suggestion. i still don't get it...

the question: a board 2 ft long with weight 50 lb is pressed against a wall. what force, applied at 30 degrees, should be applied to keep it horizontal? i'm not sure how to go about this, so i started by converting the weight of 50 lb to 22.67 kg, then getting a force of mass at 2.31 N then...