Two 10-cm-diameter charged disks face each other, 30 cm apart. The left disk is charged to - 50nC and the right disk is charged to + 50 nC . A) What is the electric field E⃗ , both magnitude and direction, at the midpoint between the two disks?
Express your answer to two significant figures and include the appropriate units.
B) What is the force F⃗ on a -1.4 nC charge placed at the midpoint?
Express your answer to two significant figures and include the appropriate units.

Awave travels at a speed of 5.2 m/s. if the distance between crests is 0.40 m, what is the frequency of the wave? use f=v/wavelength a. 13 hz b. 2.1 hz c. 0.077 hz d. 5.6 hz

Lymphocytes known as blastocysts make antibodies that fight infection. select the best answer from the choices provided t f

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?