Question

6. When a moving car is brought to a stop with its breaks, its acceleration vector is A. in the same direction as its velocity B. equal to zero C. directed downward D. directed upward E. opposite to the velocity vector 7. A 2 000-kg sailboat experiences an eastward force of 3 000 N by the ocean tide and a wind force against its sails with magnitude of 6 000 N directed toward the northwest (45° N of W). What is the magnitude of the resultant acceleration? a. 2.2 m/s b. 2.1 m/s c. 1.5 m/s d. 3.0 m/s2 8. A thrown stone hits a window, but doesn't break it. Instead it reverses direction and ends up on the ground below the window. In this case, we know a. the force of the stone on the glass > the force of the glass on the stone b. the force of the stone on the glass- the force of the glass on the stone. c. the force of the stone on the glass < the force of the glass on the stone. d. the stone didn't slow down as it broke the glass. 9. A 140 g baseball traveling initially at 30 m/s is hit by a bat and leaves traveling at 36 m/s in the opposite direction. If the ball was in contact with the bat for 0.013 s what average force did the bat exert on the ball? A. 1300 N B. 180 N C. 260 N D. 710 N E. 540 N

Answer 1

Acceleration vector and force

bsakins Hene accelsrahtor opposi te t the velau ty veues 3000IN thon Resullant acc elarahon 1X 2

062 2 1 2 0'6 2 0、013 fars