Particles in cosmic rays are mostly protons, which have energies up to about 1020 eV, where 1 eV is the change in the kinetic energy of an electron moving through a potential difference of 1 V. Use this information to estimate the path of these particles in Earth's atmosphere. Take Earth's magnetic field to be 5.0×10−5T. r = m

a) are muscles that have bands.

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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.