Light ray 1 strikes the smooth surface of a mirror as shown below. A horizontal line is labeled Mirror and there is one ray labeled 1 which falls on the mirror at a point and there are four rays of light labeled 2, 3, 4, and 5 which move away from same point on the mirror. Ray 2 is exactly vertical to the mirror, ray 1 is on the left of ray 2 and makes an angle of about 25 degrees with ray 2. Ray 3 is on the right of ray 2 and makes an angle of about 25 degrees with ray 2. Ray 4 is on the right of ray 3 and makes an angle of about 25 degrees with ray 3. Ray 5 is on the right of ray 4 and makes an angle of about 25 degrees with ray 4.

Which of the following is the reflected ray for ray 1?

In the future, people will only enjoy one sport: electrodisc. in this sport, you gain points when you cause metallic discs hovering on a field to exchange charge. you are an electrodisc player playing the popular four disc variant. the disks have charges of qa = −8.0 µc, qb = −2.0 µc, qc = +5.0 µc, and qd = +12.0 µc. (1) you bring two disks together and then separate them. you measure the resulting charge of these two disks and find that it is +5.0 µc per disk. which two disks did you bring together? (a) a and b (b) a and c (c)a and d (d)b and c(e) b and d (f) c and d. (2) you bring three disks together and then separate them. you measure the resulting charge of these three disks and find that it is +3.0 µc per disk. which three disks did you bring together? a, b, and c (a) a, b, and d (c) a, c, and d (d) b, c, and d. (3) given the resulting charge of each disk measured in (b) is +3.0 µc, how many electrons would you need to add to a disk of this charge to electrically neutralize it? electrons

Four identical lab carts each have a mass of 200 kg. different masses are added to the carts and the velocities are measured. all carts move to the right.

Which statement correctly describes the interaction between magnetic poles? north and south poles attract each other. north and south poles repel each other. two north poles will attract each other. two south poles will attract each other.