Consider a wire of a circular cross-section with a radius of r = 3.03 mm. the magnitude of the current density is modeled as j = cr2 = 5.25 ✕ 106 a/m4 r2. what is the current (in a) through the inner section of the wire from the center to r = 0.5r?

When a 5.0kg cart undergoes a 2.2m/s increase in speed, what is the impulse of the cart

Will give brainliest! jay rides his 2.0-kg skateboard. he is moving at speed 5.8 m/s when he pushes off the board and continues to move forward in the air at 5.4 m/s. the board now goes forward at 13 m/s.a. determine jay’s mass.b. determine the change in the internal energy of the system during this process.(express your answer to two significant figures and include the appropriate units.)

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?