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24 terms

physics quiz 2

STUDY
PLAY
25) The acceleration of gravity on the Moon is only one-sixth of that on Earth. If you hit a baseball
on the Moon with the same effort (and at the speed and angle) that you would on Earth, the
ball would lan
C) 6 times as far
24) A pilot drops a bomb from a plane flying horizontally at a constant speed. Neglecting air
resistance, when the bomb hits the ground the horizontal location of the plane wil
B) be over the bomb
23) A package of supplies is dropped from a plane, and one second later a second package is
dropped. Neglecting air resistance, the distance between the falling packages wil
C) increase
22) A plane flying horizontally at a speed of 50.0 m/s and at an elevation of 160 m drops a
package. Two seconds later it drops a second package. How far apart will the two packages
land on the ground
A) 100
21) A bullet is fired horizontally, and at the same instant a second bullet is dropped from the same
height. Ignore air resistance. Compare the
times of fall of the two bullets
C) They hit at the same time
20) A stone is thrown horizontally from the top of a tower at the same instant a ball is dropped
vertically. Which object is traveling faster when it hits the level ground below
B) the stone
19) When a football in a field goal attempt reaches its maximum height, how does its speed
compare to its initial speed
B) It is less than its initial speed
18) A ball is thrown at an original speed of 8.0 m/s at an angle of 35e above the horizontal. What is the speed of the ball when it returns to the same horizontal level
B) 8.0 m/s
19)You are throwing a ball for the second time. If the ball leaves your hand with twice the
velocity it had on your first throw, its horizontal range R (compared to your first serve) would
be
D) four times as much
16) An Olympic athlete throws a javelin at four different angles above the horizontal, each with
the same speed: 30e, 40e, 60e, and 80e. Which two throws cause the javelin to land the same distance away
D) 30e and 6e
15) At what angle should a water-gun be aimed in order for the water to land with the greatest
horizontal range
C) 45
14) If the acceleration of an object is always directed perpendicular to its velocity
C) the object is turning
13) If the acceleration vector of an object is directed anti-parallel to the velocity vector
C) the object is slowing down
12) A soccer ball is kicked with a velocity of 25 m/s at an angle of 45e above the horizontal. What
is the vertical component of its acceleration as it travels along its trajectory
A) 9.80 m/s2 downward
11) Ignoring air resistance, the horizontal component of a projectile's acceleration
A) is zero
10) A ball is thrown with a velocity of 20 m/s at an angle of 60e above the horizontal. What is the
horizontal component of its instantaneous velocity at the exact top of its trajectory
A) 10 m/s
9) Ignoring air resistance, the horizontal component of a projectile's velocity
B) remains constant
7) Three forces, each having a magnitude of 30 N, pull on an object in directions that are 120e
apart from each other. Make a statement concerning the resultant force
A) The resultant force is zero
6) Two vectors, of magnitudes 20 and 50, are added. Which one of the following is a possible
answer for the magnitude of the resultant
C) 40
5) Two displacement vectors have magnitudes of 5.0 m and 7.0 m, respectively. When these two
vectors are added, the magnitude of the sum
B) could be as small as 2.0 m, or as large as 12 m
4) The resultant of two vectors is the smallest when the angle between them is
D) 180
3) Which of the following is an accurate statement
A) A vector cannot have zero magnitude if one of its components is not zero
2) Which of the following operations will not change a vector
A) Translate it parallel to itself
1) Which one of the following is an example of a vector quantity?
B) velocity