An electron entering Thomson’s e/m apparatus has an initial speed (in the horizontal direction only) of 4.0 ×106 /. In the lab is a permanent horseshoe magnet of strength 12 , which you would like to use. (a) What electric field will you need in order to produce zero deflection of the electrons as they travel through the apparatus?
(b) The length of nonzero electric and magnetic fields is 2.0 . When the magnetic field is turned off, but the same electric field remains, how far in the vertical direction will the electron beam be deflected over this length?

the small 0.38-kg slider is known to move from position a to position b along the vertical-plane slot. determine (a) the work done on the body by its weight and (b) the work done on the body by the spring. the distance r = 0.70 m, the spring modulus k = 154 n/m, and the unstretched length of the spring is 0.53 m

explanation:

-reverse card

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it