Ask questions and get helpful answers.

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. 👍
  2. 👎
  3. 👁
  4. ℹ️
  5. 🚩
2 answers
  1. a = drop in potential energy = m g h
    b = gain in kinetic energy = (1/2) m v^2

    work done by friction = a - b

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
  2. -1.5kj

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩

Answer this Question

Similar Questions

  1. math

    a ball is dropped from a height of 48m and rebounds two-third of the distance it falls. If it continues to fall and rebound in this way,how far will it travel before coming to rest?

  2. Algebra II

    Suppose that an object is dropped from a height of h meters and hits the ground with a velocity of v meters per second. Then v= sqrt19.6h. If an object hits the ground with a velocity of 24.2 meters per second, from what height was it dropped? Carry your

  3. math

    You can find the distance d an object falls in feet for time t in seconds using the formula d= 16t^2. Suppose a ball is dropped out of a window of a tall building. How far will the ball in 3 seconds? a 144 ft b 96 ft c 48 ft d 16 ft plz explain how to do

  4. Physics

    An object accelerates uniformly from rest and covers 8m in 2 seconds. What is the distance covered in the third second?

  5. Physics

    An object of mass 1.00 kg is attached to a vertical spring with spring constant 100 N/m. The object is held at rest in a position such that the spring is stretched upward a distance 1.00 cm beyond its undisturbed length. If the object is released, how far

  6. Algebra

    If an object is dropped from a height of 144 ft, the function h(t) = –16t² + 144 gives the height of the object after t seconds. When will the object hit the ground? • 1.5 s • 3 s • 6 s • 9 s

  7. Physics AIPMT

    A stone is dropped under gravity from rest from a height h and it travels a distance 9h/25 in the last second. What is the height H?

  8. algebra

    5. 16t2 gives the distance in feet a free-falling object falls in t seconds. 16t2 + 10t gives the distance an object falls in t seconds when it is thrown down with an initial velocity of 10 feet per second. Use this polynomials to: a. Find how far a wallet

  9. physics

    An object dropped from a cliff falls with a constant acceleration of 10m/s2. Find its speed 2s after it was dropped? Solution:Given ,accelaration =10m/s time=2s speed=? therfore,speed=distance travelled\total time taken s=10\2=5(ans) . is it ok.

  10. science

    Object A and B both start at rest. They both accelerate at the same rate. However , object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B? a) the same distance B) twice as far c) three

Still need help?

You can ask a new question or browse existing questions.