1. Questions

Physics

The launching speed of a certain projectile is 6.4 times the speed it has at its maximum height. Calculate the elevation angle at launching.

I have noo idea how to start this one. Please help!

  1. 👍
  2. 👎
  3. 👁
  4. ℹ️
  5. 🚩
Lindsay

  1. The vertical component of velocity at max height is zero. The horizontal component remains Vh during flight, and that is the speed at max height. Let Voy be the initial vertical component of the launch speed.

    (launch speed)^2 = Voy^2 + Vh^2
    = (6.4 Vh)^2 = 40.96 Vh^2
    Voy^2 = 39.96 Vh^2
    Voy = 6.32 Vh
    launch angle arctan(Voy/Vh) = arctan 6.32 = 81.0 degrees

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    drwls

  2. How did you come up with 39.96 Vh^2?

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    Lindsay

  4. I squared 6.4 and subracted 1. See the formula

    Voy^2 + Vh^2 = 40.96 Vh^2

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    drwls

  5. This is probably really obvious, but I'm still not undertanding why you have to subtract one.

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
    Lindsay

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    A child's toy consists of a block that attaches to a table with a suction cup, a spring connected to that block, a ball, and a launching ramp. (Intro 1 figure) The spring has a spring constant k, the ball has a mass m, and the

  2. Physics

    The launching mechanism of a toy gun consists of a spring of unknown spring constant, as shown in Figure P5.33a. If its spring is compressed a distance of 0.140 m and the gun fired vertically as shown, the gun can launch a 24.0 g

  3. physics

    A projectile is fired at an angle of 30ᵒ above the horizontal from the top of the cliff 600 ft high. The initial speed of the projectile is 2000 ft/s. how far will the projectile move horizontally before it hits the level ground

  4. Physics

    A projectile is launched with an initial speed of 59.0 m/s at an angle of 32.0° above the horizontal. The projectile lands on a hillside 3.80 s later. Neglect air friction. (Assume that the +x-axis is to the right and the +y-axis

  1. Physics Question......many thanks

    A projectile is shot directly away from Earth's surface. Neglect the rotation of Earth. (a) As a multiple of Earth's radius RE, what is the radial distance a projectile reaches if its initial speed is one-fifth of the escape speed

  2. Physics

    A projectile is launched with an initial speed of 40m/s at an angle of 25 degrees above the horizontal. The projectile lands 3 sec. later. Neglect air friction. What is the projectile's velocity at the highest point of it's

  3. Physics Help

    A projectile is fired at an upward angle of 60 degrees with a speed of 100m/s. It lands on a plateau 150m higher. What is the projectile's speed the moment before it strikes the plateau? I'm thinking to just use the kinematic

  4. Physics

    A child's toy consists of a block that attaches to a table with a suction cup, a spring connected to that block, a ball, and a launching ramp. The spring has a spring constant k, the ball has a mass m, and the ramp rises a height

  1. physics

    A projectile is being launched from ground level with no air resistance. You want to avoid having it enter a temperature inversion layer in the atmosphere a height h above the ground. 1) What is the maximum launch speed you could

  2. Physics

    A projectile is launched from the earth’s surface at initial speed v0 at angle θ0 with the horizontal. When the projectile is at its maximum height h, it has half the speed it had when it was at half its maximum height (h/2).

  3. Physics

    If a projectile has a launching angle of 52 degrees about the horizontal and an initial speed of 18 m/s, what is the highest barrier that the projectile can clear?

  4. physics

    The highest barrier that a projectile can clear is 12.7 m, when the projectile is launched at an angle of 17.5° above the horizontal. What is the projectile's launch speed?

View more similar questions or ask a new question.