Physics ch. 3

What is the resultant of a 12 unit vector and a 16 unit vector that are perpendicular to each other?

20

Components

1 of the vectors, often manually perpendicular, whose sum is restultant vector. Any restulant vector can be regarded as the combo of 2 or more components.

Consider an escalator at an angle of 45° above the horizontal that moves with a velocity of 2 m/s. What is the horizontal component of the escalators velocity?

1.41

A motorboat is driven across the river at 3 km/h at right angles to a current that is following at 10 km/h. What is the resulting speed of the boat?

10.4

A projectile is launched into the air. Neglecting Air resistance what is its vertical acceleration? Its horizontal acceleration?

10m/s, 0m/s

Calculate the magnitude of the resultant of a pair of 100 km/h velocity vectors that are at right angles to each other.

141.42 km/h

Satellite in a circular, low Earth orbit move 8km/s. convert the speed to miles per hour. (There are about 1.6 km in 1 mile in 3600 seconds in one hour.)

1800 mph

If a vector that is 1cm long represents a velocity of 10km/h, what velocity does a vector 2cm long drawn to the same scale represent?

20km/ph

Neglecting air resistance, if you throw a ball straight up at the speed of 20 m/s how fast will it be moving when you catch it?

20m/s

A plane flies north at 230 km/h. At the same time, there is a 80 km/h wind from the east. Use the Pythagorean theorem him to find the resultant vector of the plane

244 km/h

Calculate the resultant of the prior velocity is 100 km/h north and 75 km/h south calculate the resultant if both of the velocities are directed north.

25 km/h

Calculate the resultant velocity of an airplane that normally flies at 200km/h if it encounters of 50 km/h tailwind. If it encounters a 50 km/h headwind.

250 km/h, 150 km/h

An airplane who's airspeed is 298 km/h flies at a parallel to the direction of the wind with a speed of 40 kilometers per hour. What are the two possible speed of the plane relative to the ground?

258, 338

A right triangle with the sides of 3, 4 and 5 units has angles that are 37°, 53°, and 90° respectively. Which of its sides is the hypotenuse? Which side is opposite the 37° angle? Which side is opposite the 53° angle?

5,3,4

how far below an initial straight-line path will projectile fall in one second. Does your answer depend on the angle of the launch or the initial speed of the projectile? Defend your answer.

5m no the distance of something in freefall is always five times time squared.

Calculate the magnitude of the horizontal and vertical components of a vector that is 100 units long and oriented at 45°.

70.7

How fast must a projectile moving horizontally travel so that the curve it follows matches the curve of the earth?

8km/s

At what angle should a slingshot be oriented for maximum altitude? For maximum horizontal range?

90* angle and 45* angle

TQ. Circle the letter of the quantity that is scalar.

A and C

Vector quantity

A quantity that requires both magnitude and direction for a complete description.

scalar quantity

A quantity that's completely described by magnitude only.

TQ. What are 2 vectors called?

A resultant

How does a vector quantity differ from a scalar quantity?

A vector quantity requires both magnitude and direction to be completl described. A sector quantity can be completly described by magnitude only.

To hit something do you shoot above it at it or below it

Above it

Vector

Am arrow whose length represents the magnitude of quantity whose direction represents the direction of the quantity.

Satellite

An object that falls around earth or some other body rather than to it.

TQ. A diagram includes a 3 cm long arrow.

B

Neglecting Air resistance, if you throw a baseball at 20 m/s to your friend who is at first base will the catching speed be greater or less than 20 m/s? Does the speed change if the air is distance is a factor?

Equal to, yes it would slow it down.

TQ. t or f velocity is scalar

F

Calculate the resultant of a horizontal vector with a magnitude of four units and a vertical vector with a magnitude of three units. How does the resultant compare with the hypotenuse of a right triangle having sides of three and four units?

Five units, it compares or it is the hypotenuse.

What force acts on the satellite that is above Earth's atmosphere?

Gravity

If an airplane flies in the direction of the wind tailwind the plane has ______ ground speed. If an airplane flies into the wind headwind the plane has a __________ groundspeed. If an airplane flies with a 90° crosswind perpendicular to the wind the plane has a _________ ground speed.

Increase decrease increase

Why do we say a rectangle is a special case of a parallelogram?

It has two sets of parallel sides.

Why is it important that such a satellite be above the earths atmosphere?

It would get too hot by friction

How does the downward component of the motion of a projectile compare with the motion of freefall?

Its the same= 10m/s

Will a vector at 45° to the horizontal be larger or smaller than its horizontal and vertical components? By how much?

Longer by 1.14 units

TQ. A scalar quantity includes

Magnitude only

Projectiles

Near the surface of Earth follow a curved path that at first it seems rather complicated. Examples of these are a cannonball shot for my canon a stone thrown into the air a ball rolling off the edge of a table and a spacecraft circling earth.

What is the maximum possible resultant of two vectors with magnitudes of four and five units? What is the minimum possible resultant?

Nine is maximum one is minimum

What do we call a projectile that continually "falls" around Earth?

Satellite

Why is speed classified as a scalar quantity? Why is velocity classified as a vector quantity?

Speed is a seclar quantity bc it's described only by magnitude. Velocity is a vector quantity bc its described magnitude and direction.

When a rectangle is constructed in order to add velocities, what represents the resultant of the velocities.

The diagonal

Resolution

The process of determining the components of a vector.

At what point in its path does a projectile have a minimum speed.

The top

Restulant

The vector sum of 2 or more componet vectors.

At the instant a ball is thrown horizontally over a level range, A ball held at the side of the first is released and drops to the ground. If ever systems has neglected, which ball strikes the ground first?

They hit the ground at the same time.

TQ. Ex of Vector than Ex of Scalar

V: 10m/s (West) S: 10m/s

In the absence of air resistance, why does the horizontal component of velocity for a projectile remain constant while the vertical component changes?

Vertical is affected by gravity horizontal isnt.

Why does a bowling ball move without acceleration when it rolls along a bowling alley?

With no horizontal force acting on the ball, there is no horizontal acceleration and no component of gravitational force acts horizontally.

TQ. is speed scalar

Yes

If you swim in a direction directly across the river and you end up downstream due to the flow of water, do you move faster than you would if the water didn't flow?

You would move faster with the water helping you along