The number of hours of daylight at any place on earth depends on

4. An electric kettle produces 2000 J of energy each second. It is filled with water, weighed and switched on. After coming to the boil, it is left on for a further 120 seconds and is then switched off. It is found to be 90 g lighter.

What happens to the angle of the wave if it hits the Perspex at 90 degrees?

What is formed when two or more different kinds of atoms or elements join together chemically

What type of reaction occurs in the cores of stars to create their tremendous amounts of energy? a. fusion b. fission c. physical d. chemical

A charged particle moving along a direction perpendicular to the plane of a loop of current-carrying wire, and which passes through the loop's center, will experience

What is the fundamental frequency of a particular medium?. a. the lowest frequency at which a standing wave is possible. b. the highest frequency at which s standing wave is possible

The distance from the inner core to the surface of the earth is about 5,200 kilometers. the large amount of material surrounding the inner core places tremendous pressure on it.

What type of wave is sound? longitudinal light surface transversal

What is the difference between meteors and meteorites?

The puzzle box is traditionally associated with the work of