Abowl of mass .5 kg, initially at rest, is kicked directly towards a fence for my points 20 m away. the velocity of the ball as it leaves the kids foot is 17 m/s at the angle of 46° above the horizontal. the top of the fence is 6 m high. the kickers what is in contact with the ball for .04 seconds. the ball hits nothing while in flight and air resistance is negligible. the acceleration due to gravity is 9.8 m/s squared. determine the time it takes for the ball to reach the plane of the fence

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

How many electrons in an atom could have these sets of quantum numbers? =3n=3 electronselectrons =4,ℓ=2n=4,ℓ=2 electronselectrons =6,ℓ=ℓ=−1n=6,ℓ=2,mℓ=−1

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