Pumpkin toss in denver, children bring their old jack-o-lanterns
to the top of a tower and compete for accuracy in hitting a target on the ground (figure 4-21). suppose that the tower is 9.0 m high and that the bull's-eye is a horizontal distance of 3.5 m
from the
launch point. if the pumpkin is thrown horizontally, what is the
launch speed needed to hit the bull's-eye?

The image shows the positions of a car on a roller coaster track. arrange the cars in order based on their gravitational potential energy. begin with the lowest potential energy and end with the highest.

Individuals who live below the poverty line get seriously ill more often than those who do not what could be the hidden variable in this situation?

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