a pendulum has a period of 2.5s, forty measurements are made with stop watch A , which has a random measuring error of =0.1s .What is the accuracy mean.​

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

Infrared rays have a shorter wavelength than question 11 options: x-rays. ultraviolet rays. radio waves. gamma rays.

While carrying a heavy box up the stairs,you set the box on a step and rest. then you pick up the box and carry it to the top of the stairs. describe these actions in terms of balanced and unbalanced forces acting on the box.