Purchase Solution

Problems on kinematics

Not what you're looking for?

Ask Custom Question

1) A plane flies 485 km away from its base at 708 m/s, then flies back to its base at 1062 m/s. What is the average speed in m/s?

2) See attachment and solve problems 15 - 17.

Attachments
Purchase this Solution

Solution Summary

The average speed/velocity and displacement for kinematics problems are examined.

Solution Preview

SOLUTION

1) By definition average speed = Total distance traveled/Total time taken

Total distance traveled = 2 x 485 km = 970000 m

Time taken for outwards journey = Distance/speed = 970000/708 = 1370 sec
Time taken for return journey = Distance/speed = 970000/1062 = 913 sec

Average speed = Total distance traveled/Total time taken = 970000/(1370+913) = 424.88 m/s

2) Attachment

As the acceleration of the car changes from time to time, we have to calculate its velocity and position at different times step by step as follows :

i). At t = 0, s=0, v=0 (given)

ii) At t = 1sec. : As during the first second, the velocity and acceleration both are zero, the object continues to be at rest. Hence, at the end of the first second s=0, v=0.

iii) At t = 3 sec : initial velocity u=0, acceleration a = 3 m/s2 (from the graph), t = 2sec.
Using v = u + at, we get final velocity v = 0 ...

Purchase this Solution


Free BrainMass Quizzes
Classical Mechanics

This quiz is designed to test and improve your knowledge on Classical Mechanics.

Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.

The Moon

Test your knowledge of moon phases and movement.

Intro to the Physics Waves

Some short-answer questions involving the basic vocabulary of string, sound, and water waves.

Basic Physics

This quiz will test your knowledge about basic Physics.