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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

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

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

Vertical Motion of a Rocket

Q: A rocket moves upward, starting from rest with an acceleration of 27.2 m/s2 for 3.49 s. It runs out of fuel at the end of the 3.49 s, but does not stop. How high does it rise above the ground?

A: Okay the rocket’s moving up with an acceleration of +27.2m/s^2 for a . . . → Read More: Vertical Motion of a Rocket

An arrow is shot off a cliff at an angle, with crosswind

Q: A student standing on the top of a cliff shoots an arrow from a height of 30.0 m at 25.0 m/s and an initial angle of 32.0° above the horizontal. There are four parts to this question.

a) What will be the horizontal and vertical components of the arrow’s initial speed?

Horizontal component . . . → Read More: An arrow is shot off a cliff at an angle, with crosswind