6 A 4 kg block with a 50 uc charge is attached to an unstretched spring (k = 100 N/m), on a frictionless
surface
If an electric field of 50000 N/C is suddenly applied to
the right, what will be the initial acceleration of the
block? (3 pts)
a
b.
What type of motion does the block experience? Please
explain. [2 pts)
хео
c
Now, instead, consider the case where the same electric field is turned on, but grows slowly from
O to full strength, what will be the final stretch of the spring from equilibrium? (3 pts)

1. what is the relationship between wavelength and the penetrating power of an electromagnetic wave? a) the penetrating power has no relationship to the wavelength. b) the penetrating power increases as the wavelength increases. c) the penetrating power decreases as the wavelength increases. d) the penetrating power decreases as the wavelength decreases. 2. as ice melts and turns into water, the speed of sound through the material would most likely do what? justify your answer. a) the speed would not change because the material is always water. b) the speed of sound would increase because the density of water is less than that of ice. c) the speed of sound would increase because energy is added to ice in order to make it melt. d) the speed of sound would decrease because sound travels faster through solids than liquids. 3.which of these waves need a medium to travel through? a) sound b) x-rays c) infrared rays d) visible light