Based on trends in the periodic table, which of these elements could be added to the column of less reactive elements in the table above? A.
nitrogen (N)
B.
palladium (Pd)
C.
calcium (Ca)
D.
lithium (Li)

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)

Afisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. it takes a time of 2.70 s for the boat to travel from its highest point to its lowest, a total distance of 0.700 m. the fisherman sees that the wave crests are spaced a horizontal distance of 6.50 m apart. a. how fast are the waves traveling? b. what is the amplitude a of each wave?