Homework (A) due Thursday and (E) due Friday -- TO BE TURNED IN

This will be collected IN CLASS.

1.  Consider a 50-g rocket with an engine that provides 5 N of force for 0.5 seconds.  Find the following:

a.  the weight of the rocket.  Recall that the mass needs to be in kg before you do any calculations.

b.  the net force acting on the rocket during thrust

c.  the acceleration of the rocket during thrust

d.  the velocity of the rocket once the engine is done burning (for 0.5 seconds)

e.  the height the rocket achieves in the first 0.5 seconds

f.  the total height the rocket will achieve

g.  the time to apogee (highest altitude)


2.  Two ropes are attached to a boulder.  The ropes are at right angles to each other.  One person pulls the first rope with a force of 100 lb, and another person pulls the second rope with a force of 150 lb.

a.  Draw this problem out

b.  What is the net force on the boulder?


3.  This is a problem that will NOT be graded - it is only to see how much trig you know.

Consider a 3-4-5 right triangle.  Determine the value of the 2 angles that are NOT 90 degrees.  Use SOH-CAH-TOA, if you know how it works.