## 24 terms

###
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

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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

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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

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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

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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

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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

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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

### 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