x Turn on thread page Beta
 You are Here: Home >< Maths

# Wave function help watch

1. Hi, I'm a bit stuck on this question and any help would be great I have completed part a just need help on b and c thanks!

V=2sin300t+3cos300t

(a) Express V in the form Ksin(300t+a ) where 0 ≤ α ≤ 180○.
(b) (i) Find the maximum value of V.
(ii) Find the first time that the voltage reaches 2 volts.
2. (Original post by Morgan1239)
Hi, I'm a bit stuck on this question and any help would be great I have completed part a just need help on b and c thanks!

V=2sin300t+3cos300t

(a) Express V in the form Ksin(300t+a ) where 0 ≤ α ≤ 180○.
(b) (i) Find the maximum value of V.
(ii) Find the first time that the voltage reaches 2 volts.
For b(i), The maximum value of sin t, where t is real, is 1. You have a sin function multiplied by a constant, so you can work out the maximum.

For c, just set V = 2.
3. (Original post by Morgan1239)
Hi, I'm a bit stuck on this question and any help would be great I have completed part a just need help on b and c thanks!

V=2sin300t+3cos300t

(a) Express V in the form Ksin(300t+a ) where 0 ≤ α ≤ 180○.
(b) (i) Find the maximum value of V.
(ii) Find the first time that the voltage reaches 2 volts.

Maximum is Root(13) volts frrom part a, I.e K

solve Ksin(300t+a ) = 2 and look for the ist positive solution

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: January 30, 2015
Today on TSR

### Unconditional offer...

But going to get a U!

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams