A body of mass x gram suspended at the 15cm mark of a ruler balanced it at the 30cm mark on a pivot. If the ruler has a mass of 36g and its centre of gravity is 55cmmark, calculate the (i) mass x (ii) distance of the balanced point of the ruler from the zero end when the body is moved to the 25cm mark.​

15. give an example for some particles or waves that are moving faster than light in everyday life 16. what is a laser? 17. what is an oscilloscope? 18. what does it means practically that nothing is faster than light in vacuum? 19. what is vacuum?

The intensity of a polarized electromagnetic wave is 12 w/m^2. part a) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=0∘ with the plane of polarization? part b) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=30∘ with the plane of polarization? part c) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=45∘ with the plane of polarization? part d) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=60∘ with the plane of polarization? part e) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=90∘ with the plane of polarization?

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? a. positive b. negative c. zero