Aspring with a spring constant of 100 n/m is relaxed at the beginning. the spring is then compressed by 0.1 m. an object of 0.01 kg is attached to the compressed spring. if the compressed spring is released, the object will experience simple harmonic motion. what is the maximum possible speed of the object during the oscillation

In a hydrogen molecule there are a total of four charges, 2 protons in the two nuclei, and 2 electrons. how many unique charge-pairs are there (without double counting)?

I) a gas contained within a piston-cylinder assembly undergoes two processes, a and b, between the same end states, 1 and 2, where p1 = 10 bar, v1 = 0.1 m3 , u1 = 400 kj and p2 = 1 bar, v2 = 1.0 m3 , u2 = 200 kj: ' process a: process from 1 to 2 during which the pressure-volume relation is pv = constant. ' process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to state 2. kinetic and potential energy effects can be ignored. for each of the processes a and b, a) sketch the process on a p-v diagram. b) evaluate the work, in kj. c) evaluate the heat transfer, in kj.(ans : qb,12 = -65.0 kj)

Hi , i am new here can anyone me out with this question why is space black after having so many shining objects like sun , moon , stars