An infinitely long line of charge has linear charge density 5.00×10−12c/m. a proton (mass 1.67×10−27 kg, charge +1.60×10−19
c) is 18.0 cm from the line and moving directly toward the line at 3.20×103m/s.
(a) calculate the proton's initial kinetic energy.
(b) how close does the proton get to the line of charge?

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

An equinox occurs when a. neither end of earth's axis is tilted toward or away from the sun. b. the north end of earth's axis is tilted away from the sun. c. the north end of earth's axis is tilted toward the sun. d. earth's axis is parallel to the sun's rays. select the best answer from the choices provided a b c d

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)