Skip to content
View in the app

A better way to browse. Learn more.
APlusPhysics Community

A full-screen app on your home screen with push notifications, badges and more.

To install this app on iOS and iPadOS
  1. Tap the Share icon in Safari
  2. Scroll the menu and tap Add to Home Screen.
  3. Tap Add in the top-right corner.
To install this app on Android
  1. Tap the 3-dot menu (⋮) in the top-right corner of the browser.
  2. Tap Add to Home screen or Install app.
  3. Confirm by tapping Install.

WA gripe of the night

(0 reviews)

By ThatGuy

· 1,378 views

im doing this problem: A horizontal force of 161 N pushes a 6 kg block up a frictionless incline that makes an angle of 27° with the horizontal...find the normal force. Okay well according to every physics lesson i know and mr F's notes online the component of gravty opposite the normal force is mgcos(angle). so id did (6kg)(9.8m/s^2)cos(27). That gets you 52.39 and WA says thats wrong. i disagree. Also, looking at a practice problem, the answer they provided was greater than what the normal force would have been if the object was on level ground....ive wasted 45 minutes on this problem and i think web assign (expicitive) it up.

  •

    2 Comments

    Recommended Comments

    Enthusiast

    FizziksGuy

    Administrators

    The key here is realizing the force applied is horizontal... then, using the data you gave me, you can put it all together so your answer looks something like this!

    image_thumb21.png

  • Quote
    • Newbie

    ThatGuy

    Members

    That makes more sense

  • Quote
    • Guest
    Add a comment...

    Account

    Navigation

    Search

    Search

    Configure browser push notifications
    Chrome (Android)
    1. Tap the lock icon next to the address bar.
    2. Tap Permissions → Notifications.
    3. Adjust your preference.
    Chrome (Desktop)
    1. Click the padlock icon in the address bar.
    2. Select Site settings.
    3. Find Notifications and adjust your preference.