DUE TONIGHT, NEED TO CONFIRM ANSWERS A child of mass 50kg swings down in a circular arc on a rope that is 2 m long. At the bottom of the swing, she has a tangential speed of 8m/s. the net centripetal force on the child ar the bottom of the swing is most nearly...
A. 1600 N
B. 800 N
C. 320 N
D. 200 N

for the same child, at the instant she is at the bottom of the swing, the direction of the centripetal force will be...
A. up
B. down
C. right
D. left​

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