1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Newtons Laws Question

  1. Oct 30, 2004 #1
    Having trouble with a homework problem on Newtons Laws, would appreciate any help:
    An airplane flies in a loop (a circular path in a vertical plane) of radius 150m. The pilot's head always points toward the center of the loop. The speed of the airplane is not constant; the airplane goes slowest at the top of the loop and fastest at the bottom. a)At the top of the loop, the pilot feels weightless. What is the speed of the airplane at this point? b) At the bottom of the loop, the speed of the airplane is 280km/h. What is the apparent weight of the pilot at this point? His true weight is 700N.

    Thanks in adavance for any assistance.
  2. jcsd
  3. Oct 30, 2004 #2
    This will be moved to homework section promptly, but anyways...

    Please show us what you have done so far. Try beginning with a free-body diagram for each position. What can you deduce about the net force acting on the pilot if he feels weightless? You may find the following formulas useful:
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Newtons Laws Question Date
Conceptual questions about Newton's Laws... Feb 5, 2018
Basic Inertia/Newton's Laws Questions Nov 1, 2017
Magneto-static force and Newton's 3rd Law Aug 9, 2017