6: A 320 Kg rock, beginning from rest, slides down a 3 m frictionless ramp that makes a 25° with the
horizontal. The rock hits a stationary cart, m =100 kg, and begins to roll.
A: Use the Newtons laws to determine the speed of the rock at the bottom of the ramp
B: Assume the rock collides with the cart completely ineleastically. What is the speed of the rock-cart
system after the collision.
C: If the collision between the rock and the cart is 0.8 sec. what was the force the cart exerted on the
rock-magnetude and direction.

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