2016年10月19日 · The ribs help in the expansion and contraction of the thoracic cavity (though that is primarily the function of the diaphragm) and also protect the lungs and heart. When the diaphragm expands or contracts, the thoracic (chest) cavity expands or contracts, alternately pulling in air (inhalation) or expelling it (exhalation). The ribs, which are flexible, along with the …

2016年10月16日 · Contraction of the diaphragm flattens it, the volume of thoracic cavity increases, pressure inside lungs diminishes and hence air rushes in: we call it breathing in. During breathing in, the volume of the chest cavity increases due to flattening of diaphragm, and the sternum is also pushed forward due to bucket-handle like movement of ribs.

2016年12月27日 · Not all humans belong to the same trophic level. This is due to the dietary choices each human makes.

2018年2月12日 · As detailed below Since, the shape is not given, let us consider the following cases of a quadrilateral with coordinates of four corners given : Case 1 : Nonuniform ...

2018年4月6日 · I would answer that it is true. This hw question is a question about notation. sin^2 (theta) is the same as (sin (theta))^2 I would read sin (theta)^2 as equivalent to sin (theta^2) (But I've noticed that WolframAlpha treats sin (theta)^2 as equal to (sin (theta))^2. I would never write sin (theta)^2 because it is ambiguous.

2015年10月21日 · No. This is confusing sin^-1 (x) with (sin (x))^-1. >arcsin (x) = sin^-1 (x) is the inverse function of the function sin (x) That is: If x in (-pi/2, pi/2), then arcsin (sin (x)) = x If x in [-1, 1] then sin (arcsin (x)) = x On the other hand: csc (x) = (sin (x))^ (-1) = 1/sin (x) is the reciprocal of the sin function. I think some of the blame for this confusion has to lie with the common ...

The functions sine, cosine and tangent of an angle are sometimes referred to as the primary or basic trigonometric functions. The remaining trigonometric functions secant (sec), cosecant (csc), and cotangent (cot) are defined as the reciprocal functions of cosine, sine, and tangent, respectively. Trigonometric identities are equations involving the trigonometric functions that …

2015年10月23日 · No. arctan (x) is the inverse function of tan (x), and it means that, if y=arctan (x), then y is a number such that tan (y)=x. In general, f is the inverse function of g if f (g (x))=g (f (x))=x. On the other hand, cot (x) simply is 1/tan (x), so it's simply the inverse number of tan (x). So, you have that, as a function, arctan (x) is the inverse of tan (x), which means that …

2016年2月10日 · A force, F, applied to an object causes an acceleration, a, which we know from Newton's 2nd law: F = m ⋅ a or a = F m Acceleration is the change of velocity per unit time, so if there is no force, all we know is that the acceleration is zero. Therefore, the velocity is not changing. If the object was already moving, then it will just keep moving. So, yes, the object …

2018年5月30日 · True (both) Acceleration is defined as the change in velocity over time: a= (Deltav)/ (Deltat)or (dv)/ (dt) If there is no change in velocity (Deltav=0) then the acceleration =0 If acceleration is constant, then the velocity will change by a constant amount every second, in other words: velocity is NOT constant.