The electric field just outside the surface of a hollow conducting sphere of radius 20 cm has a magnitude of 500 n/c and is directed outward. an unknown charge q is introduced into the center of the sphere and it is noted that the electric field is still directed outward but has decreased to 100 n/c. what is the charge q?

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

You are given a vector a = 125i and an unknown vector b that is perpendicular to a. the cross-product of these two vectors is a × b = 98k. what is the y-component of vector b?

Question 11 of 13 (1 point) jump to question: a stairway, ladder, or ramp must be present in excavations in which of the following situations? a. all trenches must have access/egress b. the trench is more than 15 feet wide but only 1 ½ feet deep c. the trench is more than 4 feet deep and the devices must be within 25 feet of all workers