Physics

I don't want an answer I would just like to know what equations to use to answer the questions. It's confusing me. i. imgur. com/6CouaRj .png

An astronaut lands on an alien planet. He places a pendulum (L = 0.200 m) on the surface and sets it in simple harmonic motion, as shown in this graph.


Answer the following questions:
a. What is the period and frequency of the pendulum’s motion?
b. How many seconds out of phase with the displacements shown would graphs of the velocity and acceleration be?
c. What is the acceleration due to gravity on the surface of the planet in m/s2? Determine the number of g-forces.
Show any necessary calculations.

thanks in advance

  1. 👍 0
  2. 👎 0
  3. 👁 216
asked by Armin
  1. the period is 2 pi * square root of L/g

    we know the length
    however to find the period we need g
    on the surface of earth g is about 9.81 m/s^3
    HOWEVER on the moon for example is is only about one sixth of that so the period will be sqrt 6 longer
    IN OTHER WORDS WE MUST KNOW g on this planet to find the period
    frequency = 1/period

    If you know the period, then of course you can find g
    T = 2 pi sqrt (L/g local)
    (T/2pi)^2 = L/g
    g local = L /(T/2pi)^2

    I can not see your graph of course but displacement and velocity are 90 degrees (pi/2) apart ad displacement and acceleration are 180 degrees (pi) apart
    eg
    if x = a sin wt
    v = a w cos wt
    (note cos wt=sin (wt+pi/2))
    a = -a w^2 sin wt = -w^2 x
    note sin (wt+pi) = -sin wt

    1. 👍 0
    2. 👎 0
    posted by Damon

Respond to this Question

First Name

Your Response

Similar Questions

  1. bobpursly & countiblis,math

    I thought that we can solve anything with equations is it always polynomials. Isn't this the same thing as finding the unknown for an equation. As i said in my previous message or am i wrong. Also what about the rational

    asked by jas20 on March 5, 2007
  2. Algebra

    So ik I cant post pictures on this site, but I just need help with this question (it’s my last question for the U2L10 FUNCTIONS ALTERNATIVE PORTFOLIO connections academy), it’s ok if you don’t give me the answer I would just

    asked by hehehehe >:D on March 18, 2019
  3. Vectors

    Consider the 2 lines with equations (x+8)/1=(y+4)/3= (z-2)/1 and (x,y,z)=(3,3,3)+t (4,-1,-1), tER. Find the point of intersection of the lines. So I that these 2 lines are perpendicular because if you do the dot product of their

    asked by Anonymous on June 20, 2018
  4. DanH-Algebra 1

    Solve the system of equations using the Addition method. 2a + 3b = -1 3a + 5b = -2 Margie: Roger's answer below is correct. If you don't understand it, please try and tell us what you don't understand. He makes it sound so strange

    asked by Margie on October 14, 2006
  5. cHEMISTRY

    i don't know how to write chemical formulas is it like nomenclature because i need to balance equations (which i know how if the equation is given to me the symbols type but not in words), i need to write skeletal equations but i

    asked by Sam on March 2, 2014
  6. Algebra

    Translate to a system of equations. DO NOT SOLVE. A nontoxic scouring powder is made up of 4 parts baking soda and 1 part vinegar. How much of each ingredient is needed for a 16-oz mixture? What are the two equations? For most

    asked by Tessa on February 19, 2009
  7. drbob222 math,correction

    i made some corrections for the previous postage can you check those when you get a chance please. Also for this one: my options of answers are: A)2y + 6/3 B)3x- 6 /2 C)2 + 2y D)2/3y + 6 Directions: Solve for x: 3x - 2y =6 3x - 2y

    asked by jasmine20 on January 11, 2007
  8. Algebra 2

    Michaela is solving rational equations. A. What is the solution set of the equation ... x^2-7x+12 (all over or divided by) x^2+x-12 both equal to 3. What I did first was factor both equations geting (x-4) on the top and (x+4) on

    asked by Macin on June 2, 2015
  9. math

    Let f(t) = Q0at = Q0(1 + r)t. f(7) = 75.94 and f(9) = 91.89 (a) Find the base, a. (Round your answer to two decimal place.) a = (b) Find the percentage growth rate, r. (Round your answer to the nearest percent.) r = % I honestly

    asked by Stella on August 29, 2015
  10. math

    Find the value of k such that the system of linear equations is inconsistent. {4x-8y = -3 {2x+ky = 16 I know that the answer is k = -4 but I don't know how to solve to get that answer.

    asked by anonymous on May 7, 2008
  11. math

    can someone correct these for me. 8x –4y = 16 y = 2x –4 My answer: This problem does not have a unique solution. This problem therefore is consistent and dependent These equations are the same. If you solve the first one for

    asked by jasmine20 on December 23, 2006

More Similar Questions