physics

posted by .

A marble is thrown horizontally with a speed of 10.5 m/s from the top of a building. When it strikes the ground, the marble has a velocity that makes an angle of 34.1 ° with the horizontal. From what height above the ground was the marble thrown?

  • physics -

    tan φ=v(y)/v(x) ,
    v(y)=v(x)• tanφ.

    v(y)=g•t, => t=v(y)/g
    h=gt²/2 =g• v²(y)/2•g²
    = v²(y)/2•g= (v(x)• tanφ)²/ 2•g= (10.5•tan 34.1º)²/2•9.8 =2.6 m.
    The answer is correct, but the given data are strange enough , especially, the angle…

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    A ball is thrown from the top of a building upward at an angle of 66 ◦ to the horizontal and with an initial speed of 16 m/s. The ball is thrown at a height of 53 m above the ground and hits the ground 33.2074 m from the base …
  2. phy

    A marble slides without friction in a vertical plane around the inside of a smooth, 21 cm-diameter horizontal pipe. The marble's speed at the bottom is 4.5 m/s this is fast enough so that the marble makes a complete loop, never losing …
  3. Physics

    A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.15 m/s at an angle of 18.5o below the horizontal. It strikes the ground 3.30 s later. How far horizontally from the base of the building …
  4. Pre-Ap Physics

    A rock is projected from the edge of the top of a building with an initial velocity of 16.3 m/s at an angle of 39 ◦ above the horizontal. The rock strikes the ground a horizontal distance of 90 m from the base of the building. …
  5. physics

    A cannon ball is fired horizontally with an initial speed of 75 m/s from the top of a 50 m tall building. When the ball hits the ground, its velocity vector makes an angle with the horizontal. What is the angle?
  6. physics

    A cannon ball is fired horizontally with an initial speed of 75 m/s from the top of a 50 m tall building. When the ball hits the ground, its velocity vector makes an angle with the horizontal. What is the angle?
  7. physics

    A ball is thrown horizontally from a building of height 80m. the kine joining the top of the building to the point where it hits the ground makes an angle of 45 degrees with the ground. what is the initial velocity of the ball?
  8. Calculus

    A marble is dropped from the top of the empire state building. a. Determine the position and velocity functions for the marble b. What is the average velocity for the first 3 seconds of flight?
  9. Physics

    A marble is thrown horizontally with a speed of 13.9 m/s from the top of a building. When it strikes the ground, the marble has a velocity that makes an angle of 40 ° with the horizontal. From what height above the ground was the …
  10. Physics

    A ball thrown horizontally from the top of a 13m high building strikes the ground 5m from the base of the building. 1) With what velocity was the ball thrown?

More Similar Questions