1.An airplane lands and begins to slow down as it moves along the runway. If its mass is 3.50×10^{5} kg and the net braking force is 4.40×10^{5} N , what is the airplane's acceleration?

2.An 1800-kg truck pulls a 590-kg trailer away from a stoplight with an acceleration of 1.70 m/s2.What is the net force exerted by the truck on the trailer?Express your answer to three significant figures and include the appropriate units. Assume that the positive

x axis is directed toward the direction of motion.

3. A 44.0 kg parachutist is moving straight downward with a speed of 3.85 m/s

Part A: If the parachutist comes to rest with constant acceleration over a distance of 0.830

m , what force does the ground exert on her?

Part B:If the parachutist comes to rest over a shorter distance, is the force exerted by the ground greater than, less than, or the same as in part A?

4.When you weigh yourself on good old *terra firma* (solid ground), your weight is 545

N . In an elevator your apparent weight is 485 N .

Part A:What is the magnitude of the elevator's acceleration?

Part B:What is the direction of the elevator's acceleration?

5. Two workers pull a raft through a lock, as shown in the figure (Figure 1) . One worker pulls with a force of 130 N at an angle of 34âˆ˜ relative to the direction of the raft's forward motion. The second crewman, on the opposite side of the lock, pulls at an angle of 45âˆ˜.With what force should the second worker pull so that the net force of the two workers is in the forward direction?

6.A 81-kg parent and a 18-kg child meet at the center of an ice rink. They place their hands together and push.If the acceleration of the child is 0.44 m/s2 in magnitude, what is the magnitude of the parent's acceleration?

**7.**An object is hanging by a string from the ceiling of an elevator. The elevator is moving upward with a constant speed. What is the magnitude of the tension in the string?

Subject | Science |

Due By (Pacific Time) | 10/18/2015 10:00 pm |

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