Two small solid metal spheres A and B have equal radii and are in a vacuum. Their centres are 15 cm apart.

Q#30 Two small solid metal spheres A and B have equal radii and are in a vacuum… Read more Two small solid metal spheres A and B have equal radii and are in a vacuum. Their centres are 15 cm apart.

(a) State Newton’s law of gravitation (b) The planet Jupiter and one of its moons,

Q#11 (a)  State Newton’s law of gravitation. [2] (b)  The planet Jupiter and on… Read more (a) State Newton’s law of gravitation (b) The planet Jupiter and one of its moons,

A radiation detector is placed close to a radioactive source. The detector does not surround the source.

Q#22 (a)  A radiation detector is placed close to a radioactive source. The d… Read more A radiation detector is placed close to a radioactive source. The detector does not surround the source.

A carrier wave is frequency modulated. (a) Describe what is meant by frequency modulation.

Q#9 A carrier wave is frequency modulated. (a)  Describe what is meant by  freq… Read more A carrier wave is frequency modulated. (a) Describe what is meant by frequency modulation.

A steel wire of cross-sectional area 15 mm2 has an ultimate tensile stress of 4.5 × 108 N m-2.

Q#21 A steel wire of cross-sectional area 15 mm 2   has an ultimate tensile str… Read more A steel wire of cross-sectional area 15 mm2 has an ultimate tensile stress of 4.5 × 108 N m-2.