A figure skater is spinning slowly with arms outstretched. She brings her arms i

Question

A figure skater is spinning slowly with arms outstretched. She brings her arms in close to her body and her moment of inertia decreases by 1/2. Her angular speed changes by a factor of Four waves are described by the following equations, in which all distances are measured in centimeters and all times are measured in seconds. 18. Which wave above (A-D) has the shortest wavelength? Which wave above (A-D) has the greatest speed? 19. In simple harmonic motion, the speed is greatest at the point in the cycle when The kinetic energy is a minimum. The potential energy is a maximum. The magnitude of the acceleration is a maximum. The displacement is a maximum The magnitude of the acceleration is a minimum. A box on a horizontal table is given an initial velocity of 5 m/s. It slides across a rough surface coming to rest in 2 m. The coefficient of kinetic friction is closest to

Explanation / Answer

a. I1w1=I2w2

I1w1=0.5*I1*w2

w2= 2*w1

option e.

c. the magnitude of acceleration is maximum

d. v=u-at

0=5-a*2

a=2.5 m/s2

ma=uk*m*g

2.5=uk*10

uk=0.25

option b.

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