In a spherical metal shell of radius r, an electron is shot from the center directly toward a tiny hole in the shell, through which it escapes. the shell is negatively charged with a surface charge density (charge per unit area) of 6.40 × 10^-13 c/m^2. what is the magnitude of the electron's acceleration when it reaches radial distances (a) r = 0.690 r and (b) 2.00r?

Mike walks 100 meter north, then walks 30 meters south. after this, he walks another 10 meters north. what is the magnitude of his total displacement during this walk,in meters?

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.

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