|
|
The branch of physical science dealing with conversion of energy from one form to another, especially involving heat.
|
|
the force acting on a rocket or an airplane, produced by the action of its motor and pulling it forward. In an airplane, thrust is one of the four forces sensed by an airplane, the others being lift, drag and weight
|
|
An atmospheric process involving particularly vigorous convection of humid, warm air. Such air stores energy not just as heat but also through its humidity, and as it rises and gets rid of its water by producing rain, the latter form of energy gives it extra heating and helps it rise even higher, to the base of the stratosphere, where the thunderstorm flattens out. As the rising air cools, some droplets freeze, and collision of frozen droplets carried in the rising air with larger ones dropping due to gravity leads to lightning.
|
|
Study of triangles (trigon=triangle), in particular of applications using trigonometric functions to reconstruct triangles if only some of their sides and/or angles are known. It is the foundation of land surveys.
|
|
Originally, the names given to the 6 possible ratios between pairs of sides in a right-angled triangle (sine, cosine, tangent, cotangent, secant, cosecant). Usually the triangle is drawn with resting on one of its shorter sides, and these functions are viewed as depending on the bottom acute angle (angle smaller than 90 degrees). Later the definitions were extended for any angle, using the unit circle. Though initially introduced as a tool of land-surveying, today trigonometric functions play a key role in many areas of mathematics.
|
|
Relations between trigonometric function which hold for any angle. For instance, if U^2 means U squared, for any angle A the identity (sinA)^2 + (cosA)^2 = 1 .
|
|
The lowest layer of the atmosphere, in which weather processes take place. See stratosphere.
|
|
The polar angle of an object in a Kepler orbit, measured from in the orbital plane from the position at closest approach. See mean anomaly, also orbital elements.
|
|