Examine the scenario.

a stream of negatively-charged particles is moving to the right in a magnetic field. the particles experience a force downward.

which situation(s) would result in the particle stream experiencing an upward force?

(select all that apply.)

a. using uncharged particles moving to the right

b. using positively-charged particles moving to the left

c. using negatively-charged particles moving to the left

d. using positively-charged particles moving to the right

What happens to the velocity of the car when the upward pull of the cable is greater than the downward pull of gravity as the car rises toward the top?

A33.1 g copper object is launched from a 1.5 m 30° steel incline positioned on the floor by being pulled up a string attached to a 50.0 g mass suspended vertically over a pulley. the object is projected towards a glass table where it lands when it is at the point along its trajectory with the lowest speed. it comes to a halt when it clears the opposite edge of the table. it then falls and lands on 9 physics texts each 5 cm thick that are stacked on the floor on the opposite side of the table. assume that the table does not have a ledge and the rectangular object experiences 0.05 n of air resistance as it falls towards the books. how far and how long did the object travel and how fast does it hit the books. assume that at the moment the copper object leaves the incline, the massless string and ideal pulley break off

What is the earliest point in the universe that we can observe? why can’t we see back further than this?