## izzy777 Group Title please helpppp!!! Robin pulls a rope attached to a sled with a force of 50 N. The rope makes an angle of 30° with the ground, as shown below. What force will move the sled vertically upwards? 183.4 N 25 N 43.3 N 100 N 2 years ago 2 years ago

1. izzy777 Group Title

2. ganeshie8 Group Title

50/sin 30

3. izzy777 Group Title

wait i dont get it?

4. ganeshie8 Group Title

by applying 50N at an angle of 30 degrees, the sled is sliding horizontally, right ?

5. izzy777 Group Title

yes

6. ganeshie8 Group Title

so, if we apply the same force vertically, the slide will move up vertically

7. ganeshie8 Group Title

|dw:1340941337117:dw|

8. ganeshie8 Group Title

so, we need to calculate the value of "x" for which the vertical component becomes "50"

9. ganeshie8 Group Title

use trigonometry and find..

10. izzy777 Group Title

i don't know how to solve it...

11. izzy777 Group Title

im so confused

12. ganeshie8 Group Title

see the angle 30 once. can you tell whats the opposite side for that angle ?

13. izzy777 Group Title

well one of the angles = 90 degrees the other one has to be60

14. ganeshie8 Group Title

|dw:1340941561296:dw|

15. ganeshie8 Group Title

$$\huge sin\ 30 = \frac{50}{x}$$

16. ganeshie8 Group Title

$$\huge x = \frac{50}{sin\ 30} = 100N$$

17. ganeshie8 Group Title

hope it is clear now... ?

18. izzy777 Group Title

yes! i think i get it now :) thank you so much can you help me with one more question?

19. ganeshie8 Group Title

sure..

20. izzy777 Group Title

A force of 8 N is exerted on a box. The component of this force which acts along the ground has a magnitude of 6.93 N, as shown below. What is the measure of angle x? 40° 50° 60° 30°

21. izzy777 Group Title

22. ganeshie8 Group Title

use cosine

23. izzy777 Group Title

?

24. ganeshie8 Group Title

cos x = adj/hyp = 6.93/8 x = cos^-1(6.93/8) degrees