Physics

posted by Aprill

1. A 10-kg object is dropped from rest. After falling a distance of 50 m, it has a speed of 26 m/s.
a. Write the expression for the change in mechanical energy caused by the dissipative (air) resistive force on the object during this descent.
b. Calculate the energy.

  1. Damon

    a = drop in potential energy = m g h
    b = gain in kinetic energy = (1/2) m v^2

    work done by friction = a - b

  2. Cynthia

    -1.5kj

Respond to this Question

First Name

Your Answer

Similar Questions

  1. physics # 7

    7. An object falling in air experiences a drag force directly related to the square of the speed such that F = Cv2 (where C is a constant of proportionality). Assuming that the buoyant force due to air is negligible, the terminal velocity …
  2. Physics

    An object falling under the pull of gravity is acted upon by a frictional force of air resistance. The magnitude of this force is approximately proportional to the speed of the object, which can be written as f = bv. Assume b = 19 …
  3. Physical Science

    A 15 Kg object that is free falling has a total mechanical energy of 13,230 Joules. (A) From what height was the object dropped?
  4. physics

    An object falling under the pull of gravity is acted upon by a frictional force of air resistance. The magnitude of this force is approximately proportional to the speed of the object, which can be written as f = bv. Assume that b …
  5. physics

    A 9.00 kg object starting from rest falls through a viscous medium and experiences a resistive force = -b , where is the velocity of the object. The object reaches one half its terminal speed in 5.54 s. (a) Determine the terminal speed. …
  6. Physics

    1. A 2.5kg rock is dropped from a 350m cliff. It hits the ground with a speed of 60 m/s. What percent of its mechanical energy was lost to air resistance?
  7. Physics

    Starting from rest, a 6.70 kg object falls through some liquid and experiences a resistive (drag) force that is linearly proportional to the velocity of the object. It's measured that the object reaches half its terminal speed at 4.50 …
  8. physics

    An object falling under the pull of gravity is acted upon by a frictional force of air resistance. The magnitude of this force is approximately proportional to the speed of the object, which can be written as f = bv. Assume b = 16 …
  9. calculus help check and help

    if an object with mass m is dropped from rest, one model for its speed v after t seconds, taking air resistance into account is v= mg/c(1-e^(-ct/m)) where g is the acceleration due to gravity and c is a positive constant describing …
  10. Physics- check answer please

    1. A 15 kg boy falls out of his bed at a height of 0.50 m. What is the amount of gravitational potential energy lost by the boy?

More Similar Questions