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Can someone help me solve this equation?

  • #1

Homework Statement



Here's the equation I have:

0-730=V0sin(-37.0)(5.00)-(1/2)(9.8m/s2)(5.00)2

Homework Equations





The Attempt at a Solution



I know the answer is 202 m/s. I just can't figure out how to get there. I've reduced it to:

-730=(V0sin(-37.0))(5.00)-122.5

The sine is throwing me a curve ball. It's just an example equation out of the book so that I can solve the real one in my homework. I'm sure it's something simple I'm missing.

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
gneill
Mentor
20,800
2,778
sin(-37.0°) has a real valued result. What is it?
 
  • #3
98
0
Can I ask why is the sin causing you a problem?
 
  • #4
vela
Staff Emeritus
Science Advisor
Homework Helper
Education Advisor
14,639
1,276
Why is it confusing you? sin -37.0° is just a number.
 
Last edited:
  • #5
537
0
If you're using a claulator, make sure your trig functions use degrees rather than radians - that might be the trick
 
  • #6
sin(-37.0)= -.601815

But when I try to solve -730=V0(-.601815)(5.00)-122.5 I get -730=V0-125.509. I just don't see how to go from that to the answer V0=202 m/s
 
  • #7
gneill
Mentor
20,800
2,778
sin(-37.0)= -.601815

But when I try to solve -730=V0(-.601815)(5.00)-122.5 I get -730=V0-125.509. I just don't see how to go from that to the answer V0=202 m/s
Vo multiplies (-.601815)(5.00). Don't add (-.601815)(5.00) to -122.5!
 
  • #8
Haha! Success!!! I've figured it out. I knew it had to be something simple. I just needed someone to clear things up for me. Thanks a million!
 

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