Okay so for a problem, say i wana find how far must u bring ur hands across the string to get a frequency of 350. How would u go about solving that
Careful! Velocity and acceleration are both vectors--direction counts.Alt+F4 said:A satellite is in circular orbit at a fixed radius from the center of the earth and with a constant speed. Which one of the following statements is correct about the satellite?
(a) The acceleration is constant but the velocity is not.
(b) Both the acceleration and the velocity are constant.
(c) Neither the acceleration nor the velocity are constant.
WHy so? Constant Speed = Constant Velocity
First things first. Momentum is a vector. Start by finding the total momentum of the 5-kg and 2-kg pieces.Alt+F4 said:http://online.physics.uiuc.edu/cgi/courses/shell/phys101/spring06/prep2a.pl?practice/exam2/sp99 [Broken] Question 18
(5)(6) + (2) ( 20) - (x)(25) = 0
X = 2.8 why is it 2
So what's the magnitude of the total momentum (of those two pieces)?Alt+F4 said:okay so Total Mom = (5)(6) for X, For Y it is (2)(20)
so for X = 30
so for Y = 40
so the vecotr of the third one
u get an angle of 53.13
For the cylinder to be in equilibrium, the torques must balance. Torque depends on the moment arm.Alt+F4 said:http://online.physics.uiuc.edu/cgi/courses/shell/phys101/spring06/prep2a.pl?practice/exam2/sp04 [Broken]
15*9.8*50 / 80 = 91.8 ~92
What exactly is the formula since i dont get why you do that, i just have it memorized Why multiply by radii?
Alt+F4 said:Okay i need this straighen out before exam, An elevator going downward say it is Accelerating. Does that Mean Acc is - or is it postive?
So can u just explain to me When say Gravity is negative etc..
Does - Acceleration mean that ur slowing down? Deacc
Acceleration is the rate of change of velocity. It's a vector and has direction. Calling acceleration + or - is just a sign convention to indicate direction. Usually, + means up and - means down. Note that acceleration and velocity are not necessarily in the same direction. Just because the elevator is moving down, doesn't mean it's acceleration is downward. (It could be slowing down, for instance.)Alt+F4 said:Okay i need this straighen out before exam, An elevator going downward say it is Accelerating. Does that Mean Acc is - or is it postive?
All that means is that the force of gravity (and the acceleration due to gravity) acts downward, the negative direction.So can u just explain to me When say Gravity is negative etc..
Not at all. Acceleration just means that your velocity is changing. Toss a ball straight up into the air. The acceleration is always downward (negative). As the ball rises, it slows; as it falls, it speeds up. But it's always accelerating down.Does - Acceleration mean that ur slowing down?