A 50.0 kg circus performer jumps from a platform into a safety net below. The net, which has a force constant of 5.0 × 104 N/m, is stretched by 0.40 m. If the unstretched net is positioned 1.00 m above the ground, what is the height of the platform above the ground? (Ignore the effects of air resistance.)

What are the theoretical properties of a gas at a temperature of 0 kelvin?

I'm thinking it's 2 you are asked to explain the earth's magnetic field. which is the best reply? 1. the earth's magnetic south is similar to the north pole of a magnet. 2. the earth's core has a strong magnetic charge similar to the south pole of a magnet. 3. the earth's geomagnetic south is similar to the south pole of a magnet. 4. the earth's magnetic charge is not centered at either pole; it varies based on location.

Select for each of the following statements whether it is correct or incorrect. (a) in an isothermal expansion of an ideal gas. (b) the temperature remains constant. (b) the pressure remains constant. (c) there is work done by the gas. (d) there is heat added to the gas. (e) the change in internal energy equals zero.