- #1

- 48

- 0

## Homework Statement

r1=(0m)

r2=(2000i + 1000j)m

v1=(200j)m/s

v2=(200i-100j)m/s

## Homework Equations

tantheta=vy/vx

v2^2=v1^2+2ax

v2=v1+at

x2=x1+v1t+1/2at^2

## The Attempt at a Solution

Thank you for any help

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Thread starter PEZenfuego
- Start date

- #1

- 48

- 0

r1=(0m)

r2=(2000i + 1000j)m

v1=(200j)m/s

v2=(200i-100j)m/s

tantheta=vy/vx

v2^2=v1^2+2ax

v2=v1+at

x2=x1+v1t+1/2at^2

Thank you for any help

- #2

- 54

- 0

So what do we have to find??

- #3

- 48

- 0

find the saucer's acceleration in unit vectors and in terms of magnitude and direction.

- #4

SammyS

Staff Emeritus

Science Advisor

Homework Helper

Gold Member

- 11,365

- 1,032

Are those kinematic equations for components of vectors, or for vectors themselves?## Homework Statement

View attachment 50618

r1=(0m)

r2=(2000i + 1000j)m

v1=(200j)m/s

v2=(200i-100j)m/s

## Homework Equations

tantheta=vy/vx

v2^2=v1^2+2ax

v2=v1+at

x2=x1+v1t+1/2at^2

## The Attempt at a Solution

View attachment 50617

Thank you for any help

- #5

- 48

- 0

Are those kinematic equations for components of vectors, or for vectors themselves?

If you click the first picture, you will have an understanding equal to mine. I'm sorry.

- #6

SammyS

Staff Emeritus

Science Advisor

Homework Helper

Gold Member

- 11,365

- 1,032

Sorry for the slow response.If you click the first picture, you will have an understanding equal to mine. I'm sorry.

I should have been more direct with my earlier response.

The set of kinematic equations you have

(v2)^{2}=(v1)^{2}+2ax

(v2)=(v1)+at

x2=x1+(v1)t+1/2at^{2}

are valid for each component of displacement, velocity, and acceleration.(v2)=(v1)+at

x2=x1+(v1)t+1/2at

So you have two such sets of kinematic equations:

(v2)_{x}^{2} = (v1)_{x}^{2} + 2a_{x}x

(v2)_{x} = (v1)_{x} + a_{x}t

x2 = x1 + (v1)_{x}t + 1/2a_{x}t^{2}

(v2)_{y}^{2} = (v1)_{y}^{2} + 2a_{y}y

(v2)_{y} = (v1)_{y} + a_{y}t

y2 = y1 + (v1)_{y}t + 1/2a_{y}t^{2}

(v2)

x2 = x1 + (v1)

(v2)

(v2)

y2 = y1 + (v1)

- #7

- 48

- 0

Sorry for the slow response.

I should have been more direct with my earlier response.

The set of kinematic equations you have(v2)are valid for each component of displacement, velocity, and acceleration.^{2}=(v1)^{2}+2ax

(v2)=(v1)+at

x2=x1+(v1)t+1/2at^{2}

So you have two such sets of kinematic equations:(v2)_{x}^{2}= (v1)_{x}^{2}+ 2a_{x}x

(v2)_{x}= (v1)_{x}+ a_{x}t

x2 = x1 + (v1)_{x}t + 1/2a_{x}t^{2}

(v2)_{y}^{2}= (v1)_{y}^{2}+ 2a_{y}y

(v2)_{y}= (v1)_{y}+ a_{y}t

y2 = y1 + (v1)_{y}t + 1/2a_{y}t^{2}

It makes sense now. thank you.

- #8

SammyS

Staff Emeritus

Science Advisor

Homework Helper

Gold Member

- 11,365

- 1,032

What did you get for answers?It makes sense now. thank you.

Share: