Physics Online Quiz

The angle of friction and angle of repose are equal to each other. The angle which the resultant of force of limiting friction F and normal reaction R makes with direction of normal reaction R is called angle of friction. Angle of repose is the steepest angle at which a sloping surface formed of loose material is stable.

The energy crisis is a result of many different strains on our natural resources. There is a strain on fossil fuels such as oil, gas, and coal due to overconsumption – which then, in turn, can put a strain on our water and oxygen resources by causing pollution.

A geostationary satellite is an earth-orbiting satellite, placed at an altitude of approximately 35,800 km directly over the equator, that revolves in the same direction the earth rotates (west to east). At this altitude, one orbit takes 24 hours, the same length of time as the earth requires to rotate once on its axis. So they seem stationary, relative to the Earth's surface.

A communications satellite's transponder is the series of interconnected units that form a communications channel between the receiving and the transmitting antennas. It is mainly used in communication satellite to receives signals from an earth station and transmits them to different directions.

X-rays are similar to gamma rays in that they are photons of pure energy. X-rays and gamma rays have the same basic properties but come from different parts of the atom. X-rays are emitted from processes outside the nucleus, but gamma rays originate inside the nucleus.

The spoon dropped by an astronaut in a satellite will continue to follow the motion of the satellite. The reason that an object (spoon) will maintain its orbit, regardless of its position in the orbit, is because the gravitational force from the larger object (earth) will constantly act upon the smaller object, thereby pulling the smaller object towards the larger object.

One of the most common examples of Pascal's Law is the hydraulic braking system present in automobiles. According to this law when pressure is applied on fluid it travels equally in all directions so that uniform braking action is applied on all four wheels.

An integrated circuit (IC) is a set of electronic circuits on one small flat piece of semiconductor material, usually silicon. IC can function as an amplifier, oscillator, timer, microprocessor, or even computer memory.

The swing of a spinning cricket ball in the air can be explained on the basis of turbulence caused by wind.

The strongest force in nature is nuclear force, also called the strong nuclear interaction. It is the strongest of the four fundamental forces of nature.