Two people are standing 100m apart on the bank of a river that flows due east. if a rock on the opposite bank is along a bearing of n 25 degrees east from one person and along a bearing of n 15 degrees west from the other person, what is the width of the river?

Aparticle travels in a circular orbit of radius 21 m. its speed is changing at a rate of 23.1 m/s2 at an instant when its speed is 37.2 m/s. what is the magnitude of the acceleration (in m/s? ) of the particle?

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?