Posted: 22 June 2007 at 12:48am  IP Logged



1) a 12 kg block is at rest on an incline that is 26 from the x axis. the coefficients of static and kinetic friction are s = 0.55 and k= 0.47 respectively.
the acceleration of gravity is 9.8 m/s
what is the frictional force acting on the 12 kg mass??
2) an air puck of mass 0.175 kg is tied to a string and allowed to revolve in a circle of radius 1.23 m on a horizontal, frictionless table. the other end of the string passes through a hole in the center of the table and a mass of 1.27 kg is tied to it. the suspended mass remains in equilibrium while the puck revolves.
the acceleration of gravity is 9.8 m/s
a)what is the tension in the string? in units of N
b) what is the horizontal force acting on the puck? in units of N
c) what is the speed of the puck? in units of m/s
3) assume: the student is swinging the ball in suck a way that the string does not provide any tangential acceleration to the ball.
the acceleration of gravity is 9.8m/s
a student swings a ball attached to the end of a string in a vertical circle. Hint: the student is not providing tangential acceleration.
the speed of the ball at its highest point is 2.74 m/s and at its lowest point is 5.24027 m/s. the radius of the circle he's making is 0.509 m
a) find the magnitude of the acceleration of the ball at its highest point. in units of m/s
b) find the magnitude of acceleration of the ball at its lowest point. in units of m/s
c) consider point A at the midpoint between the two other points. if the ball's speed is Vm at poing A, what is the magnitude of acceleration there?? find the formula to be used.
