C2H2

1)

You're driving on a straight road (in the +x direction) at a constant speed of 27 m/s. In 10 seconds, you speed up to 41 m/s to pass a truck. (a) Assuming your car speeds up at a constant rate (constant force by the road on the tires), what is your average 2! component of velocity Vavg'X during this maneuver? Vavg,x = m/s (b) How far do you go during this maneuver? total distance = m On a straight road (taken to be in the +x direction) you drive for an hour at 60 km per hour, then quickly speed up to 100 km per hour and drive for an additional two hours. (a) How far do you go (4x)? total distance = km (c) Why isn't Vavg,x equal to the arithmetic average of your initial and final values of Vx, (60+100)/2 = 80 km per hour? (b) What is your average x component of velocity (Vavg,x) o The arithmetic mean is not a valid way to calculate the average in this situation. Vavg,x = km/hr o The initial velocity isn't zero. o The velocity isn't constant. Additional MaterialsFor each graph of Vx vs. tin the left column, choose the letter (a-i) corresponding to the appropriate description of motion. Not all descriptions will be used. Assume the usual coordinate system (+x to the right, +y up, +z out of the page). "x a. A cart moves to the left, gmdually speeding up. \\ b. A cart moves to the right, gradually speeding up. c. A cart moves to the left, gradually slowing down, stops, and moves to the right, speeding up. k; "x d. A cart moves to the right, gradually slowing down. v. e. A cart moves to the right, gradually slowing down, stops, and moves to the left, speeding up. / l f. A cart moves to the left, gradually slowing down. 74; g. A cart moves to the left at constant speed. Xv. E] E]. E] E] E] E] h. A cart moves to the right at constant speed. i. A cart remains stationary and does not move. a C e J OThe x component of the momentum of an object is observed to increase with time: At t = 0 s, = 30 kg . m/s At t = 1 s, = 40 kg . m/s At t = 2 s, = 50 kg . m/s At t = 3 s, = 60 kg . m/s What can you conclude about the x component of the net force acting on the object during this time? O Fnet, x is increasing with time. O Fnet, x is decreasing with time. o Not enough information is given. O Fnet, x is zero. o Fnet, x is constant