# Project #87653 - PhyzKyd

1.An airplane lands and begins to slow down as it moves along the runway. If its mass is 3.50×105 kg and the net braking force is 4.40×105 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?

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?
 The magnitude of the tension in the string is less than the magnitude of the weight of the object. The magnitude of the tension in the string is equal to the magnitude of the weight of the object. The tension in the string cannot be determined without knowing the speed of the elevator. The tension in the string is zero. The magnitude of the tension in the string is greater than the magnitude of the weight of the object.

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