In the design of an amusement-park ride, the cars are attached to arms of length r = 25 m which are hinged to a central rotating collar which drives the assembly about the vertical axis with a constant angular rate ω = 0.34 rad/s. the cars rise and fall with the track according to the relation z = (h/2)(1-cos 2θ) where h = 6.8 m. find the r-, θ-, and ϕ-components of the velocity v of each car as it passes the position θ = 42°.

the bal will not change its velocity.

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note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.

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