(01.04 HC)
The table shows the potential energy and kinetic energy of a skier at two different
positions on a hill.
Position and Energy
Position (above ground) Kinetic Energy Potential Energy
100 meters
O units 50,000 units
60 meters
30,000 units
What is the kinetic energy of the skier at a height of 60 meters above ground?
20,000 units, because total energy remains unchanged
80,000 units, because total energy remains unchanged
20,000 units, because total energy of the skier decreases
80,000 units, because total energy of the skier decreases

What mass will a pumpkin have a force of 450 newton’s accelerates it to 110 m/s^2? include the correct units.

What is the angular momentum of the bar about the axle?

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