Question

16 Which of the following is true about the skater
a. Her angular velocity increases when her arms are spread out because her hands exert a force on her body
b. Her angular velocity decreases when her arms are pulled close to her body because linear momentum is conserved
c. Her angular velocity increases when her arms are pulled close to her body because angular momentum is conserved
d. Her angular velocity decreases when her arms are spread out because angular energy is conserved.

17 Which of these laws must the restoring force of an oscillating system obey for it to be regarded as a simple harmonic oscillator?
a. Newton's first law of motion
b. Hooke's law of elasticity
c. The law of conservation of momentum
d. The law of conservation of matter

Answer 1

16.c. Her angular velocity increases when her arms are pulled close to her body because angular momentum is conserved
17.b. Hooke's law of elasticity