Suppose we suspend a negatively charged ball like a pendulum inside a hollow but completely enclosing metal box. Assume that the ball hangs a few inches from the box's left vertical face. Imagine that we now bring a very strong positively charged object to a point just to the left of the box's left face, so that it is only a few inches away from the suspended ball (though the box's left face is between them). The ball will be deflected strongly away from the external object. weakly toward the external object. not the least little bit. strongly toward the external object. weakly away from the external object.
A ship sets out to sail to a point 117 km due north. An unexpected storm blows the ship to a point 128 km due east of its starting point. (a) How far and (b) in what direction (as an angle from due east, where north of east is a positive angle) must it now sail to reach its original destination? (a) Number Units (b) Number Units
Vector A→ has a magnitude of 13.2 units and points due west. Vector B→ points due north. (a) What is the magnitude of B→ if A→ + B→ has a magnitude of 15.7 units? (b) What is the direction of A→ + B→ relative to due west? (c) what is the magnitude of B→ if A→ − B→ has a magnitude of 15.7 units? (d) What is the direction of A→ − B→ relative to due west? (Note: Use the convention that an angle north of west is positive, and an angle south of west is negative.) (a) Number Units (b) Number Units (c) Number Units (d) Number Units