Please help me on this Physics homework!!?

Question

1) The following quantities describe location or its change: position, distance, and displacement. Which are vectors?

2) Margaret walks to the store using the following path: 0.480 miles west, 0.285 miles north, 0.300 miles east. What is her total displacement? That is, what is the length and direction of the vector that points from her house directly to the store?

3) You will be hiking to a lake with some of your friends by following the trails indicated on a map at the trailhead. The map says that you will travel 1.3 mi directly north, then 2.4 mi in a direction 35° east of north, then finally 1.6 mi in a direction 15° north of east. At the end of this hike, how far will you be from where you started, and what direction will you be from your starting point?

4) Jason drives due west with a speed of 30.0 mi/h for 30 min, then continues in the same direction with a speed of 60 mi/h for 2 h, then drives farther west at 25 mi/h for 37.0 min. What is Jason's average velocity?

5) To get to a concert in time, a harpsichordist has to drive 120 miles in 2.09 hours.

(a) If he drove at an average speed of 53.0 mi/h in a due west direction for the first 1.21 h, what must be his average speed if he is heading 30.0° south of west for the remaining 52.8 min?
mi/h
(b) What is his average velocity for the entire trip?
Magnitude mi/h
Direction °

6) A motor scooter travels east at a speed of 12 m/s. The driver then reverses direction and heads west at 17 m/s. What was the change in velocity of the scooter?

7) If a car traveling at 26 m/s is brought to a full stop in 4.4 s after the brakes are applied, find the average acceleration during braking.

8) An 1093 kg airplane starts from rest and accelerates forward for 8 s until it reaches its takeoff speed of 38 m/s. What is the average forward force on the airplane during this time?

9) A particle experiences a constant acceleration that is north at 100 m/s2. At t = 0, its velocity vector is 75 m/s east. At what time will the magnitude of the velocity be 100 m/s?

Additional Details

10) As a baseball is being caught, its speed goes from 32.0 m/s to 0.0 m/s in about 0.0050 s. The mass of the baseball is 0.155 kg.

(a) What is the baseball's acceleration?

(b) What are the magnitude and direction of the force acting on it?

(c) What are the magnitude and direction of the force acting on the player who caught it?

11) A student stands on a bathroom scale in an elevator at rest on the 64th floor of a building. The scale reads 828 N.

(a) As the elevator moves up, the scale reading increases to 957 N. Find the acceleration of the elevator.

(b) As the elevator approaches the 74th floor, the scale reading drops to 782 N. What is the acceleration of the elevator?

(c) Using your results from parts a and b, select which change in velocity, starting or stopping, takes the longer time. Explain.

Answer 1

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Newtonian Mechanics