# Physics Chp 5

magnitude and direction
a vector is a quantity that has ?
magnitude
a scalar is a quantity that has ?
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ALL OF THE ABOVE
– draw the vector with correct magnitude and orientation
– measure the sides of the rectangle
– draw a rectangle so that the vector is the diagonal
in order to find the components of a vector, you should ?
the vertical components of its velocity
the horizontal components of a projectile’s velocity is independent of ?
always false
in the absence of air friction, the vertical component of a projectile’s velocity doesn’t change as the projectile moves ?
always true
in the absence of air friction, the horizontal components of projectile’s velocity doesn’t change as the projectile moves ?
neither; they both hit the ground at the same time
at the instant a ball is thrown horizontally with a large force, an identical ball is dropped from the same height. Which ball hits the ground first ?
entirely horizontal
a ball is thrown into the air at some angle, at the very top of the ball’s path, it’s velocity is ?
45 degrees
in the absence of air resistance, the angle at which a thrown ball will go the farthest is ?
air friction slows the ball
a ball is thrown in the air will never go fast as physics ideally would predict because ?
at the top of it’s path
at what part of a path does a projectile have a minimum speed ?
30 m/s
a cannonball is launched from the ground at an angles of 30 degrees above the horizontal and a speed of 30 m/s. ideally (no air resistance) the ball will land on the ground with a speed of ?
0.8 s
a projectile launched horizontally hits the ground in 0.8 seconds, if it has been launched with a much higher speed in the same direction it would have hit the ground in ?
is not acted on by any horizontal forces
a projectile is fired horizontally in a vacuum, the projectile maintains its horizontal component of speed because it ?
g downward
an object is dropped and falls freely to the ground with an acceleration of g, if it is thrown upward at an angles instead, its acceleration would be ?
60 degrees
a baseball is hurled into the air at an angles of 30 degrees above the horizontal and lands on a target that is at the same level as that where the baseball started, the baseball will also led on the target if it is thrown at an angle of ?
60 m downrange
a cannonball is launched horizontally from a tower, if the cannon has a barrel velocity of 60 m/s where will the cannonball be 1 second later ?
the same as when it was at the top of its path
after a rock thats thrown straight up reaches the top of its path and is starting to fall back down, its acceleration ?
more
an airplane flying into a head wind loses ground speed, and an airplane flying with the wind gains ground speed, if an airplane files at right angles to the wind, then ground speed is ?
no higher
jose can jump vertically 1 meter from his skateboard when is it at rest, when the skateboard is moving horizontally, jose can jump ?
8 units
which best approximates the resultants of a pair of 6-unit vector at right angles to each other ?
5 units
what is the resultant of a 3-unit and 4-unit vector at right angles to each other ?
no different
in chapter 2, you learn about “hang time” the time a jumper’s feet are off the ground in a vertical jump, if the upper runs horizontally and has the same vertical component of takeoff velocity, hang time will be ?
230 km/h
suppose a small plane can fly at 170 m/h relative to the surrounding air, suppose that there is a 60 km/h tailwind, how fast does the plane’s shadow move across the ground ?
neither- they both hit the ground at the same time
at the instant a ball is thrown horizontally with a large force, an identical ball is dropped from the same height, which ball hits the ground first ?
5 m
a cannonball is fired at some angles into the air, in the first second it moves 5 meters horizontally, assuming it doesn’t hot the ground the air resistance is negligible, how far does it move horizontally the next second ?
15 degrees
in the absence of air resistance, at what other angle will a thrown ball go the same distance as once thrown at the angle of 75 degrees ?
10 m/s
a ball is thrown straight upward at 10 m/s, ideally the ball will return to the thrower’s hand with a speed of ?
80 m
a cannon with a barrel velocity of 140 m/s launches a cannonball horizontally from a tower, neglecting air resistance , how far vertically will the cannonball have fallen after 4 seconds ?
8 km/s
in order to achieve orbit, a projectile must be launched horizontally at what speed ?
FALSE
T/F a quantity that has both magnitude and direction is called a scalar :
FALSE
T/F a quantity that has only a magnitude is called a vector :
FALSE
T/F the vector sum is called the resultant :
TRUE
T/F the length of a vector represents its magnitude :
TRUE
T/F the orientation of a vector shows its direction :
FALSE
T/F when adding two vectors at right angles, the resultants of the vectors is the algebraic sum of the two vectors :
FALSE
T/F a single vector can be replaced by two vectors in the x- and y- directions that are right angles to each other, these 2 x and y are called resultants of the original vector :
FALSE
T/F a ball will go the farthest of thrown almost horizontally :
TRUE
T/F an vector can represented by two other vectors that are at right angles to each other :
FALSE
T/F mass is a vector quantity :
TRUE
T/F wind velocity can be represented as a vector quantity :
FALSE
T/F you throw a baseball at an upward angles into the air, the vertical distance between the baseball and an imaginary line tracing the upward angles into infinity is greater than the vertical distance the baseball would fall if it were dropped from rest and had been falling for the same amount of distance :

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