Physics

posted by .

A salami sandwich is dropped from the top of a 37 m tall construction crane. What is the speed of the sandwich when it is halfway to the ground?

(Use conservation of energy!)

  • Physics -

    Ek + Ep = mg*37.
    Ek + mg*18.5 = mg*37
    Ek = mg*37 - mg*18.5 = mg*18.5
    Ek = 0.5m*V^2 = mg*18.5
    V^2 = mg*18.5/0.5m = 2g*18.5 = 19.6*18.5
    = 363 Joules.
    V = 19 m/s.

    Ek = Kinetic energy.
    Ep = Potential energy.

  • Physics -

    Correction
    V^2 = 363 (m/s)^2. NOT 363 Joules.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. French

    When I want to say I love to eat ham, apple and sandwich, should I use J'aime manger le jambon or un jambon, la pomme or une pomme, et le sandwich or un sandwich?
  2. AP Physics - Work and Energy

    A projectile is fired at an upward angle of 45 degrees from the top of a 265-m cliff with a speed of 185 m/s. What will be its speed when strikes the ground below?
  3. Physics

    A projectile is fired at an upward angle of 25.0^\circ from the top of a 310 m cliff with a speed of 220 m/s. What will be its speed when it strikes the ground below?
  4. physics

    A crane lifts a concrete hopper of mass 370 kg from the ground to the top of a 38 m building that is under construction. The hopper moves with a constant speed during the lift. The power rating of the crane motor is 8.2 kiloWatts. …
  5. physics

    A crane lifts a concrete hopper of mass 370 kg from the ground to the top of a 38 m building that is under construction. The hopper moves with a constant speed during the lift. The power rating of the crane motor is 8.2 kiloWatts. …
  6. Spanish 6th grade

    How do I say a ham sandwich or a cheese sandwich?
  7. Physics

    A mouse of mass 5.0 g spots the corner of a peanut butter sandwich of mass 8.0 g left on an ice rink after a game. Excited, the mouse runs out onto the ice, but immediately begins to slide. The mouse reaches the peanut butter sandwich …
  8. 3rd grade math

    when they arrived at jill's, her mother served them a deli sandwich. she cut the sandwich in to 12 sections. jill and her 8 friends each ate 1 section. how much of the sandwich was left over. answer with 2 equal fractions
  9. Physics

    Kaitlin is going off to her physics class, jogging down the sidewalk at a speed of 3.30m/s . Her husband Scott suddenly realises that she left in such a hurry that she forgot her sandwich, so he runs to the window of their apartment, …
  10. Physics

    Use the Law of conservation of energy to predict the final speed of a bowling ball dropped from the top of a 25.0 m tall building just before hitting the ground. ignore air resistance.

More Similar Questions