Facebook Page
Twitter
RSS
+ Reply to Thread
Results 1 to 3 of 3
  1. MHB Master
    karush's Avatar
    Status
    Offline
    Join Date
    Jan 2012
    Location
    Wahiawa, Hawaii
    Posts
    1,918
    Thanks
    1,590 time
    Thanked
    448 times
    #1
    1 What must your carís $V_{av}$ be in order to travel $\textbf{235 km}$ in $\textbf{2.75 h}$
    \begin{align*}\displaystyle
    V_{av}&=235km/2.75h \, km/h \\
    &=\color{red}{85.45 \, km/h}
    \end{align*}

    2 A particle at $t_1 =Ė2.0 s$ is at $x_1 = 4.8 cm$ and at $t_2 = 4.5 s$ is at $x_2 = 8.5 cm$.}\\
    i. What is its average velocity over this time interval?\\
    ii. Can this be calculated. Why or why not?
    \begin{align*}\displaystyle
    v_{av}&=\frac{x_2-x_1} {t_2-t_1}\\
    &=\frac{8.5-(4.8)}{4.5-(-2.0)}\\
    &\approx \color{red}{.57}
    \end{align*}

    3 A bird can fly $25 km/h$.
    How long does it take to fly $3.5 km?$


    \begin{align*}\displaystyle
    D&=R \cdot T\\
    \therefore \frac{D}{R}&=T \\
    \frac{25}{60}=\frac{5}{12}&=\frac{3.5}{min}\\
    5 \ min&=3.5(12) \\
    T&=.7(12)=\color{red}{8.4 \, min}
    \end{align*}

    Ok I know these are relatively easy problems but they will get harder fast,
    there is no book anwswer this is from a class that is already over.
    I am trying to format these problems so that they look like a math text book solution
    So suggestions are very welcome.
    #2 has a negative time in it but I assumed it could be calculated anyway


    $$\tiny\textit{Embry-Riddle Aeronautical University Dept of Physical Sciences, HW $\# 1-3$ PS 103 / Technical Physics I}$$

  2. # ADS
    Circuit advertisement
    Join Date
    Always
    Location
    Advertising world
    Posts
    Many
     

  3. MHB Journeyman
    MHB Site Helper
    MHB Math Helper
    Rido12's Avatar
    Status
    Offline
    Join Date
    Jul 2013
    Posts
    713
    Thanks
    3,439 times
    Thanked
    845 times
    Thank/Post
    1.185
    Awards
    Chat Box Champion (2014)  

MHB Model User Award (2014)
    #2
    1. Correct
    2. Correct, might want to include units.
    3. Correct.

  4. MHB Master
    karush's Avatar
    Status
    Offline
    Join Date
    Jan 2012
    Location
    Wahiawa, Hawaii
    Posts
    1,918
    Thanks
    1,590 time
    Thanked
    448 times
    #3 Thread Author
    Quote Originally Posted by Rido12 View Post
    1. Correct
    2. Correct, might want to include units.
    3. Correct.
    $\begin{align*}\displaystyle
    v_{av}&=\frac{x_2-x_1} {t_2-t_1}\\
    &=\frac{8.5-(4.8)}{4.5-(-2.0)}\\
    &\approx \color{red}{.57 \, cm/s}
    \end{align*}$

Similar Threads

  1. Replies: 4
    Last Post: November 30th, 2017, 21:59
  2. Replies: 11
    Last Post: November 5th, 2016, 07:23
  3. Group Velocity and Phase Velocity
    By Joystar1977 in forum Other Advanced Topics
    Replies: 1
    Last Post: January 28th, 2014, 16:06
  4. Velocity time graph help
    By Jerome in forum Physics
    Replies: 5
    Last Post: September 30th, 2013, 03:04
  5. Replies: 0
    Last Post: December 9th, 2012, 07:58

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Math Help Boards