Question

1) A person walks first at a constant speed of 1.35 m/s along a straight line from point to point and then back along the line from B to at a constant speed of 0.75 m/s. It takes the person 100s to walk from point @to point . a) What is her average speed over the entire trip? (10 points) b) What is her average velocity over the entire trip? (5 points) 2) Newton's law of universal gravitation is represented by G M.m where F is the magnitude of the gravitational force exerted by one small object on another, M is a distance. Force has the SI units kg m/s a) What are the SI units of the proportionality constant G? (5 points) The height of a helicopter above the ground is given by h 2.90r', where h is in meters and t is in seconds. At t 3) 1.65 s, the helicopter releases a small mailbag and continues to rise at the same rate. a) Find the initial position of the mailbag when it is released (s points) b) Find the initial velocity of the mailbag when it is released (10 points) c) How long after its release does the mailbag reach its maximum height? (10 points) d) What is the distance between the mailbag and the helicopter when the mailbag has reached its maximum height? (10 points) 4) Carry out the following arithmetic operations. (Give your answers to the correct number of significant figures.) (1o points) a) the sum of the measured values 756, 37.2, 0.83, and 2 b) the product 0.003 2 x 356.3 The period of a pendulum is the time for one complete swing back and forth. It is experimentally known to have the following relation ? = 2 , ??G) Where L-length of the pendulum, and "'g"- the acceleration due to gravity a) Find the power of "n'" by dimensional analysis (10 points) 5)

could someone help me understand these problems, the proper steps to solve them please.