代写Physics Quiz代写留学生Matlab语言

Question:

A car travels in an easterly direction for 55 minutes and then a southerly direction for 34 minutes. After this period, its displacement is 71 km at S 68 °E. Answer this question with the correct number of significant figures.

Part 1)

What is the displacement of the car? For these questions,  represents a unit vector in the easterly direction and  represents a unit vector in the northerly direction.

                         +                          km

Part2)

What is the average velocity of the car?

                         +                          km

Part 3)

What is the average speed of the car?

                         km/h

Question:

In a galaxy far, far away, a ball is dropped from a height of 224 m onto a planet. The acceleration due to gravity on the planet is 7.60 m/s2 and the planet has no atmosphere, so air resistance is negligible. Give your answer with the correct number of significant figures, simplify and evaluate all your expressions as much as possible.

Part 1)

Write an expression to describe how the velocity of the ball changes with time, t, as it falls. Assume it is dropped from rest at t O s. Define the surface of the planet as y =0 and the initial height of the ball yo= 224 m.

vy =                          m/s

Part 2)

Write an expression in terms of t for the displacement of the ball as it falls

y =                          m

Part 3)

How long is the ball in free fall for?

t =                          s

Question:

On a windy day a wind blows from S 58.1°W with a speed of 13.33 m/s. In this question  represents a unit vector in the easterly direction and represents a unit vector in the northerly direction.

Part 1)

Present the velocity of the wind relative to the ground in unit vector notation.

w rel g =                         +                          m/s

Part 2)

You are on a boat travelling S 50.3 °E relative to the bank (ground) at a speed 3.95 m/s. What is the velocity of the wind relative to the boat? Give your answer in unit vector notation.

w rel b =                         +                          m/s

Part 3)

What is the velocity of the boat relative to the wind?

b erl w =                         +                          m/s