8 When a person stands on tiptoe (a strenuous position). The total gravitational
force on the body, F is supported by the force n exerted by the floor on the toes
of one foot. I is the force exerted by the Achilles tendon on the foot and R is the
force exerted by the tibia on the foot. Find the values of T, R, and when F=
n=700 N.

more than, less

less than, more

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.

chemical energy --> gravitational potential energy --> kinetic energy --> elastic potential energy --> gravitational potential energy

explanation:

when emma starts the hike, the chemical energy stored in her body is used to climb up the mountain, and so she gains gravitational potential energy (because at the end, she will be at a higher height h above the ground). then she goes bungee jumping: as she falls, this gravitational potential energy is converted into kinetic energy (because her speed increases as she falls down), until the point when the rope stretches, and she stops moving. at that moment, all the kinetic energy is converted into elastic potential energy due to the stretching of the rope. then, this energy is released because the rope returns to its natural length, and emma gains a small increase in altitude , so she gains some gravitational potential energy.