Asig 4

sec. 4-4 Average Acceleration and Istantaneous Acceleration 9) A particle moves so that is position (in meters) as a function of time (in seconds) is -> ^ ^ ^ r = i + 4r^(2) j + t K. Write expresions for (a) velocity and (b) its acceleration as fuctions of time. -> 11) the position r of a particle moving in an xy plane is given by -> ^ ^ -> r = (2.00 t^(3) - 5.00t) i + (6.00 - 7.00t^(4)) j , with r in meters and t in seconds. In unit - vector notation, calculate -> -> -> (a) r ,(b) v, and (c) a for t = 2.00s. (d) wath is the angle between the positive direction of the x and a line tangent to the particle's path at t = 2.00s?

13) a cart is propelled over an xy plane with acceleration components ax = 4.0m/s^(2). Its initial velocity has components V0x = 8.0m/s(2) and V0y = 12m/s(2). In unit - vector notation, what is the velocity of the cart when it reaches its greatest y coordinate?

sec. 4-6 Projectile Motion Analyzed 17) A projectile is fired horizontally fromn a gun that is 45.0m above flat ground, emerging from the gub with a speed of 250m/s. (a) How long does the projectile remain in the air? (b) At what horizontal distance from the firing point does it stike the ground? (c) What is the magnitude of the vertical component of its velocity as it stikes the ground?

19) A ball is shot from the ground into the air. At a height of 9.1m, its velocity is -> ^ ^ ^ ^ v = (7.6 i + 6.1 j)m/s^(2), with i horizontal an d j upward. (a) To what maximun height does the ball rise? (b) What total horizontal distance does the ball travel? What are the (c) magnitude and (d) angle (below the horizontal) of the ball's velocity just before it hits the ground?

MAMIX CADA VEZ Q VEAS Q DICE : -> r ----

esa flechita q esta ahi es q es un vector

^ i ------ la jodienda esa q esta encima de la i tienes q ponercela (a la i, j y k) ^(2) ------ significa q es al cuadrado o al cubo

cualquier cosa me llamas