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Jogger Vector Question Using Cosine Law

Q: A jogger runs 100 m due west, then changes direction for the second leg of the run. At the end of the run, she is 175m away from the starting point at an angle of 15.0° north of west. What were the direction and length of her second displacement? Use graphical techniques.

. . . → Read More: Jogger Vector Question Using Cosine Law

Kinematics of a Fire Hose

Q: A fireman, 50.0 m away from a burning building, directs a stream of water from a ground level fire hose at an angle of 30.0° above the horizontal. If the speed of the stream as it leaves the hose is 40.0m/s, at what height will the stream of water strike the building?

A: . . . → Read More: Kinematics of a Fire Hose

Airplane Vectors, Using Trigonometry

Q: A commuter airplane starts from an airport and takes the route shown in Figure P3.17. It first flies to city A located at 175 km in a direction 30.0° north of east. Next, it flies 150 km 20.0° west of north to city B. Finally, it flies 190 km due west to city . . . → Read More: Airplane Vectors, Using Trigonometry

A car rolling off a cliff

Q: A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 24.0° below the horizontal. The negligent driver leaves the car in neutral, and the emergency brakes are defective. The car rolls from rest down the incline with a constant acceleration of 4.00 m/s2 for a . . . → Read More: A car rolling off a cliff

Horizontal Launch off a Cliff

Q: An object is launched horizontally off a cliff with a velocity of 14 m/s. a) How long will it be in the air for? b) How far, horizontally, will the ball move before hitting the ground?

A: The keys to this question is that horizontal velocity is constant, and initially the vertical velocity . . . → Read More: Horizontal Launch off a Cliff

Airplane with Tailwind and Headwind

Buy a graphing calculator

Q: An airplane flew 3 hours with a 40 mph head wind. The return trip with a tail wind of the same speed took 2 hours. Find the speed of the plane in still air.

A: When you have a headwind, you have to subtract the wind’s speed from the . . . → Read More: Airplane with Tailwind and Headwind

Vectors

Q: What is the difference between a scalar and a vector quantity?

A: A scalar quantity is one that is described only by a magnitude. A vector quantity is described by both a magnitude AND a direction.

If I say, “I walked 4 kilometres to the store” 4 kilometres is a scalar quantity, because . . . → Read More: Vectors

QuizMe BC – Online Quizzes

quizmeBC has an excellent database of quiz questions for Physics 12.

You can customize your quizzes to include questions from a variety of chapters.

Ball thrown vertically upwards

Q: A tennis ball is thrown vertically upward with an initial velocity of +6.7 m/s. What will the ball’s velocity be when it returns to its starting point? The acceleration of gravity is 9.81 m/s^2.

A:

Its velocity will be – 6.7 m/s.

This is true for anything that is thrown vertically upwards. Look . . . → Read More: Ball thrown vertically upwards

Kinematics Equations

Q: What are the kinematics equations?

Where = displacement = initial velocity = final velocity = acceleration = time

These are very useful, and you will use them many times before you are finished Physics 11. It would definitely help to memorize . . . → Read More: Kinematics Equations