PLEASE HELP ME IM DESPERATE! You are pushing a 15 kg box across the floor. You are applying 30 N of force straight forwards. The coefficient of friction between the box and the floor is 0.35. List each force acting on the box and determine its magnitude.

An electron in an x-ray machine is accelerated through a potential difference of 1.00 × 104 v before it hits the target. what is the kinetic energy of the electron in electron volts?

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?

Wo small variable-thrust jets are actuated to keep the spacecraft angular velocity about the z-axis constant at ? 0 = 1.16 rad/s as the two telescoping booms are extended from r1 = 1.18 m to r2 = 4.69 m at a constant rate over a period of 124 seconds. the small 19-kg experiment modules at the ends of the booms may be treated as particles, and the mass of the rigid booms is negligible. determine the necessary thrust t for each jet as a function of time where t = 0 is the time when the telescoping action is begun. after you have the general expression for t, answer the questions. show work.