Homework Help: physics

Posted by sara on Wednesday, February 15, 2012 at 9:31pm.

A particle is moving clockwise in a circle of radius 1.54 m. At a certain instant, the magnitude of its acceleration is a = 26.0 m/s2,and the acceleration vector has an angle of θ = 50° with the position vector, as shown in the figure. At this instant, find the speed, v of this particle.

physics - bobpursley, Wednesday, February 15, 2012 at 9:44pm
a*sin50=v^2/r solve for v
physics - sara, Wednesday, February 15, 2012 at 9:48pm
not the right answer
physics - drwls, Thursday, February 16, 2012 at 7:49am
It seems to me that a*cos50 is the centripetal component of the acceleration. The position vector is in the radial direction.

a*cos50 = v^2/r = 16.71 m/s^2
v^2 = 25.74 m^2/s^2
v = 5.07 m/s
physics - sara, Thursday, February 16, 2012 at 12:14pm
thanks

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