In the figure above, a box of mass 2.5kg is initially at rest on a rough inclined plane. Assuming the
mass is released and acquires a velocity of 4m/s at point P, the base of the incline. Find
A) The Work done against friction. (6 marks)
B) The Friction force.

Suppose a diode consists of a cylindrical cathode with a radius of 6.200×10^−2 cm , mounted coaxially within a cylindrical anode with a radius of 0.5580 cm . the potential difference between the anode and cathode is 260 v . an electron leaves the surface of the cathode with zero initial speed (v initial=0). find its speed vfinal when it strikes the anode.

Which of the following is the best name for mgcl2

The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656(red) and 486 (blue). light from a hydrogen lamp illuminates a diffraction grating with 500 lines per mm, and the light is observed on a screen 1.50 behind the grating. what is the distance between the first-order red and blue fringes?