A person, with a mass of 100 Kg and an unknown height, throws a 0.3 Kg football so that it is released at the same level as the top of his head. After he releases the football, it flies high into the air, peaking at a height of 2.4 meters, then comes down and impacts the ground(assume same level as where his feet are). A radar gun records the velocity of the football as it leaves his hand, 12.5 m/s, and also as it reaches its peak, giving out a reading of 12 m/s. What is the total energy of the ball/earth system, in joules?

What is the Potential Energy Gravity of the football as it is being released, in joules?

What is the height of the football player, in meters?

What is the Kinetic Energy of the football, in m/s, the instant it is about to impact the ground(but not actually slowing down from the ground yet)?

What is the velocity of the football, in m/s, the instant it is about to impact the ground(but not actually slowing down from the ground yet)?

How do the measurements of charge at the different locations on the sphere compare to each other? the charge measurements are different at all locations on the sphere. the charge measurements are virtually not the same at all locations on the sphere except for the charge at the very top and at the very bottom that are equal. the charge measurements are virtually the same at all locations on the sphere except for the charge at the very top. at the top, the conductive sphere has a small disk that is made of different material. the charge measurements are the same at all locations on the sphere. what happens to the charge on the conductive sphere when it is connected to a source of charge such as the electrostatic voltage source? nothing will happen because no charge goes around the surface of the sphere. the charge on the conductive sphere spreads out over the surface of the sphere; being greater in some specific locations on the sphere. the charge on the conductive sphere spreads out uniformly over the surface of the sphere. the charge on the conductive sphere spreads out non-uniformly over the surface of the sphere.

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)