A firefighter of mass 79 kg slides down a vertical pole with an acceleration of 4 m/s 2
.
The acceleration of gravity is 10 m/s
2
.
What is the friction force that acts on him?
Answer in units of N.

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

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.

answer///terminator or twilight zone;