promotion image of download ymail app
Promoted
asdek asked in Science & MathematicsPhysics · 9 months ago

2 Physics Quiz Questions Help Please?

) At t = 0 a stone is thrown with an initial velocity, vi = 20 m/s at an angle, θi = 53O above the horizontal. (Take g = 10 m/s2, cos53O = 0.6, sin53O = 0.8,). Find the horizontal and vertical components of its position (x, y) and velocity (vx, vy) at the height point and at t = 3 s.

4- a) A block, M = 5 kg starts from rest and moves down the inclined plane making angle θ = 37O with the horizontal. The kinetic friction force acting on the block is, fk = 10 N, see the figure. (a) Draw the free body diagram and find the acceleration of the block and (b) Find the normal force and the coefficient of kinetic friction µk between the block and the inclined surface (cos37O = 0.8, sin37O = 0.6, g = 10 m/s2).

2 Answers

Relevance
  • 9 months ago
    Favorite Answer

    vx = 20 * 0.6 = 12 m/s

    vy = 20 * 0.8 = 16 m/s

    During the 3 seconds, the vertical component of the stone’s velocity will have an acceleration of -10 m/s^2

    vy = 16 + -10 * 3 = -14 m/s

    (12,-14)

    4- a)

    The net force is the component of the force that is parallel minus the friction force.

    Force parallel = m * g * sin θ = 50 * 0.6 = 30 N

    Normal force = m * g * cos θ = 50 * 0.8 = 40 N

    Ff = μ * 40

    μ * 40 = 10

    μ = 0.25

    Net force = 30 – 10 = 20 N

    a = 20 ÷ 5 = 4 m/s^2

    I hope this is helpful for you.

    • asdek9 months agoReport

      Thanks a bunch!

    • Commenter avatarLogin to reply the answers
  • 9 months ago

    Do your own homework, or just acknowledge that you don't deserve whatever diploma/degree you're working on.

    • asdek9 months agoReport

      It takes less effort to simply ignore my question and move on, which would also make you a less of an asshole and take no effort on your part. Instead you choose to be an asshole and type this garbage, I feel bad for whoever you interact, get a life dipshit.

    • Commenter avatarLogin to reply the answers
Still have questions? Get your answers by asking now.