What is the value of secx when sinx = -0.40 and tanx > 0?

  • Thread starter Thread starter Xtremeownage
  • Start date Start date
  • Tags Tags
    Trigonometry
AI Thread Summary
When sinx = -0.40 and tanx > 0, secx can be determined using the relationship between sine, cosine, and secant. The discussion indicates that the angle corresponding to sin(x) = -0.40 is in the fourth quadrant, while the second angle is in the third quadrant. To find secx, the cosine value must be calculated, as secx is the reciprocal of cosine. The correct value of secx, rounded to the nearest hundredth, is determined to be 1.09. This conclusion is reached by considering the properties of trigonometric functions in different quadrants.
Xtremeownage
Messages
9
Reaction score
0
If sinx = -0.40 and tanx > 0, then secx, to the nearest hundreth, is

A) 0.92

B) -0.92

C) -1.09

D) 1.09

So I figured that sin^-1 = -23.57817848, but I don't know how to get sec, can someone help!
 
Last edited:
Physics news on Phys.org
I would assume it is in the 3rd quadrant as well
 
There are 2 angles for x that correspond to sin(x) = -0.40
the one you found is in the 4th quadrant, there is one in the 3rd quadrant as well
 
Thanks, Ill try solving it now
 
I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
Thread 'Collision of a bullet on a rod-string system: query'
In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
Thread 'A cylinder connected to a hanging mass'
Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...

Similar threads

Back
Top