Recent content by mwhowell

  1. M

    Range of A for Real Roots of Ay2 - 3y + 4 = 0

    yea i know how to use the quadratic formula but i am still really confused
  2. M

    Range of A for Real Roots of Ay2 - 3y + 4 = 0

    yea i know the quadratic formula but we are not given the value inside the square root. all the info we are given is stated in the problem up there
  3. M

    Range of A for Real Roots of Ay2 - 3y + 4 = 0

    what is a discriminant?
  4. M

    Range of A for Real Roots of Ay2 - 3y + 4 = 0

    Homework Statement Consider the following equation in y: Ay2 – 3y + 4 = 0. What is the range of possible values for A such that the two roots are both real? Homework Equations The Attempt at a Solution Not sure how to approach this problem.
  5. M

    Angled Force Problem: Solving for Object Position, Velocity, Speed

    Homework Statement An object having mass 2 kg is initially at rest on a horizontal surface having essentially no friction. Consider the object at the origin of a Cartesian coordinate system. At t=0 the force F = (8 N , –6 N ) is applied to the object. a) Where is the object at t = 4...
  6. M

    Free fall problem with an extra variable

    Homework Statement Jane is riding in a hot air balloon that is rising vertically at a constant speed of 3m/s over a lake. She reaches out and drops a rock from the balloon when the distance from the rock to the water is 50m. Use g=10m/s2, and let the up direction be positive. How long...
  7. M

    Velocity and acceleration on a track

    the reason i am asking is because i got the question wrong already
  8. M

    Velocity and acceleration on a track

    velocity has a vector and magnitude so there has to be a difference and what is the reason the acceleration is greater in the curve? can you supply an explanation for that?
  9. M

    Velocity and acceleration on a running track

    sorry i thought it posted https://www.physicsforums.com/showthread.php?t=434826
  10. M

    Velocity and acceleration on a running track

    Homework Statement A runner runs with a constant speed around the track. 1. At which point is the runner's velocity the largest? Explain. 2. At which point is the runner's acceleration the largest? Explain Homework Equations The Attempt at a Solution It seems to me...
  11. M

    Velocity and acceleration on a track

    Homework Statement A runner runs with a constant speed around the track. a) at which of the points is the runner's velocity the largest? Explain. b) at which point is the runner's acceleration the largest? Explain.Homework Equations The Attempt at a Solution I believe the runner has the...
  12. M

    Simple Gravity Problem: Finding an Object's Maximum Height

    Homework Statement An object is thrown strait up. It rises 80m and falls back to its original height. Take the object's original height as the origin and use g=10m/s^2. How long does it take the object to reach its max height? Homework Equations The Attempt at a Solution...
  13. M

    Solving a Degree/Radian Function: f(t) = 42cos(2t + 93°)

    i convert from ms to s then do it out again but without separating the argument. i get -1.29 which is still wrong.
  14. M

    Solving a Degree/Radian Function: f(t) = 42cos(2t + 93°)

    Homework Statement f(t) = 42cos(2t + 93°), where t is measured in seconds f(808ms) = Homework Equations The Attempt at a Solution 42cos(2t)+42cos(93^o^)= 42cos(1616)+42cos(1.62)= 1200.92+1.2= but that's wrong..help!
  15. M

    Solving Cartesian Vector Problems: |D|, |E|, D+E, E-D

    so does that just mean D= (3,2)?