13-90. The boy of mass 40 kg is sliding down the spiral
Chapter 13, Problem 13-90(choose chapter or problem)
The boy of mass \(40 \mathrm{~kg}\) is sliding down the spiral slide at a constant speed such that his position, measured from the top of the chute, has components \(r=1.5 \mathrm{~m}\), \(\theta=(0.7 t) \mathrm{rad}\), and \(z=(-0.5 t) \mathrm{m}\), where t is in seconds. Determine the components of force \(\mathbf{F}_r, \mathbf{F}_\theta\), and \(\mathbf{F}_z\) which the slide exerts on him at the instant \(t=2 \mathrm{~s}\). Neglect the size of the boy.
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