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Physics
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Topic Topic: physics homework! please help!! Post ReplyNew Question
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Clotch22
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Joined: 22 June 2007
Location: United States
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Posted: 22 June 2007 at 12:48am | IP Logged Quote Clotch22

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.

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