Question

1 of 1 MEDGAR EVERS COLLEGE he City University of Nes Tere Basic Physics PHY 114 -W-01 Department of Physical and Computer Sciences Medgar Evers College Assignment 5 Name: Write or type work and solutions on a separate paper. If written, write legibly. 1. When the Sun is directly overhead, a hawk dives toward the ground with a constant velocity of 5.00 m/s at 60.0 south of west. Caculate the speed of its shadow on the level ground 2. The velocity vector of a particle is What is the vector in component form and its speed at t-5s? 3. A golf ball is hit off a tee at the edge of a cliff has position veetor r(t) 18.0ti+(4.00-4.90)jm What is the speed of the ball at 3.00s? Extra Credit: Find the velocity vector and speed at t-5 of a particle whose acceleration components are as follows 1 2345 12345

Answer 1

V = V_0 cos 60 degrees = 2.5 m/s V(t) = (20 + 4t)i^^-15 j^^At t = 5S V = (20 + 4 times 5)i^^-15 j^^V = 40 i^^-15 j^^Speed V = squareroot 40^2 + (-15)^2 = 42.72 m/s r(t) = 18t i^^+ (4t - 4.9t^2)j^^V^vector = dr(t)/dt = 18i^^+ (4 - 9.8 t)j^^At t = 3S V^vector = 18i^^+ (4 - 9.8 times 3)j^^V^vector = 18 i^^-25.4 j^^Speed V = squareroot 18^2 + (-25.4)^2 = 31.13 m/s