A metal cube has a mass of 5.81kg and is at rest on a table. The length of one side of the cube is 8.00 cm.
Which row in the table gives the correct values for density of the metal and pressure exerted by the
cube on the table top?
Density of the metal / kg/m3 Pressure due to cube / Pa

A 11300 9080
B 11300 1510
C 11300 908
D 1510 9080
E 1510 1510
F 1510 908

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

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?