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  1. K

    Quadratic Question

    Homework Statement A coin it thrown from the top of a building, and its height in metres above the ground after 0, 1, 2, 3, 4, and 5 seconds is recorded as follows: {200, 203, 202, 197, 188, 175}. algebraically determine the function that describes this situation and use it to determine when...
  2. K

    Quadratic Question Dealing With Perimeter

    Am I off track by saying fill in -2x+35 for y? Then use x = -b / 2a ? Thanks for all the help, by the way.
  3. K

    Quadratic Question Dealing With Perimeter

    SA = x^2 + x^2 + xy + xy + xy + xy SA = 2x^2 + 4xy That what you meant?
  4. K

    Quadratic Question Dealing With Perimeter

    Homework Statement Jillian is getting ready to send a holiday package in the mail. The rectangular package has a square base and the sum of all the edges of the package measures 140 cm. What dimensions will produce a package with the largest possible surface area? Homework Equations...
  5. K

    Need to calculate work from mass and two velocities

    oh, man, i sure was thinking too hard. thank you very very much! well appreciated!
  6. K

    Need to calculate work from mass and two velocities

    Homework Statement Calculate how much work is done when a 1150 kg car accelerates from 2 m/s to 6m/s Homework Equations The Attempt at a Solution I have no idea. It seems like insufficient information to me. Please help! I am in great need as my exam is drawing near! Thanks!
  7. K

    Solving Equations Using the Unit Circle

    im not using equations, i am getting my exact values from the unit circle
  8. K

    Solving Equations Using the Unit Circle

    Homework Statement Find all solutions to the equation below such that -180° \leq x \leq 90° 2sin2x + sinx = 0 Homework Equations The Attempt at a Solution 2sin2x + sinx = 0 sinx[2sinx + 1] = 0 sin x = 0 sinx= -1/2 x = {0° + 360°n {-180° + 360°n n\epsilonI
  9. K

    Perception of Sounds

    Homework Statement A person on a bicycle is traveling away from a parked car. If the horn of the car is sounded, how will the bicycle rider perceive the sound? A) The pitch will be higher than normal. B) The pitch will be lower than normal. C) The pitch will appear to steadily...
  10. K

    AM/FM Radio Waves & Diffraction

    Homework Statement Typical AM radio waves usually have a frequency between 540 kHz and 1400 kHz. FM radio waves tend to have frequencies between 89 MHz and 105 MHz. Both types of waves travel at the speed of light. In terms of diffraction, use this information to help explain why in many low...
  11. K

    Water Waves - Universal Wave Equation

    Water Waves -- Universal Wave Equation Homework Statement Attached. Homework Equations v=fλ The Attempt at a Solution f= cycles/time f= 45/60 f= 0.75 Hz The trouble I am having is wondering if λ is 28 m or do i have to do something else to find λ?
  12. K

    Work-Energy Theorem Question

    Ahh! I multiplied by 3.6 instead of dividing! Thanks!
  13. K

    Work-Energy Theorem Question

    Homework Statement A skier comes crashing into the netting at the bottom of a ski hill. The skier has a mass of 85 kg and is moving at a speed of 65 km/h (234 m/s). (a) How much work is done by the netting while bringing the skier to rest? (b) If the "spring" constant for the netting is...
  14. K

    Law of Conservation of Energy Question

    So, how about this: [0] + [(10 kg)(9.8)(0.5 m)] = [1/2(10 kg)(0^2)] = [1/2(100 N/m)(x^2)] 0 + 49 = 0 + [50(x^2)] x= {sqrt[49/50]} x= 0.99m Did I do this right? Thanks for all the replies by the way!
  15. K

    Law of Conservation of Energy Question

    Homework Statement A 10.0 kg mass slides from rest down a frictionless inclined plane from a height of 0.500 m. After traveling 5.0 m along the ramp, it moves along a horizontal surface (frictionless again) where it makes contact with a spring. The force constant of the spring is 100.0 N/m...
  16. K

    Kinetic Energy question

    Thanks for the help!
  17. K

    Gravitational Potential Energy of a box

    Ahh, silly me! Thank you very much! Have a nice day :)
  18. K

    Gravitational Potential Energy of a box

    Homework Statement a 18.5 kg box is slid up a 5.6 m long ramp that makes an angle of 33 degrees with the floor. What is the gravitational potential energy of the box relative to the floor? m = 18.5 kg d = 5.6 m http://musr.physics.ubc.ca/~jess/symbols/Theta.gif = 33° PEg = ? Homework...
  19. K

    Kinetic Energy question

    Homework Statement Explain how a golf ball and a football can have the same kinetic energy even if their masses are different. Homework Equations None. The Attempt at a Solution A golf ball and a football can have the same kinetic energy even if their masses are different...
  20. K

    Dynamics Question Grade 11 Level

    Thank-you for welcoming me here! I hope to be able to both get help and help people when my physics knowledge improves. And even more thanks for helping me understand this question! :) Much Appreciated.
  21. K

    Dynamics Question Grade 11 Level

    Homework Statement A parachutist experiences an air friction force of 150 N and an acceleration of 7.9 m/s^2. What is the combined weight of the parachutist and the parachute? Homework Equations None. The Attempt at a Solution a= (Fg-Ff)/(m) 7.9 = (mg-Ff)/(m) 7.9 =...
  22. K

    Momentum Question

    Ahh, I guess I was thinking too hard for that, haha. Thanks.
  23. K

    Momentum Question

    Hello! I am doing a sample exam that was given out last year so I can prepare for this years coming exam, which means I also have the answer key. So, I know the answer to the question but I am no sure how to get it. Please help, thanks. A tennis ball and a ball made of putty of the same...
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