Question 1

Suppose David Ortiz hits a home run which travels 361. feet (110. m). Assuming it left the bat at 50.°, how fast was it hit?

Accepted Answer

The answer of Suppose David Ortiz hits a home run...

Question 2

A pilot drops a bomb from a plane flying horizontally at a constant speed. When the bomb hits the ground, the horizontal location of the plane will

Accepted Answer

A)  be behind the bomb. 
B)  be in front of the bomb. 
C)  be over the bomb. 
A)  be behind the bomb. 
B)  be in front of the bomb. 
C)  be over the bomb.

Question 3

You toss a ball to a friend. When the ball reaches its maximum altitude, its acceleration

Accepted Answer

A)  is 2*g. 
B)  changes sign. 
C)  is constant. 
D)  is g/2. 
E)  is zero. 
A)  is 2*g. 
B)  changes sign. 
C)  is constant. 
D)  is g/2. 
E)  is zero.

Question 4

The driver of a motorboat that can move at 10 m/s wishes to travel directly across a narrow strait in which the current flows at 5 m/s.
(a) At what angle upstream should the driver head the boat? 
(b) How long will it take to cross a distance of 1.6 km?

Accepted Answer

The answer of The driver of a motorboat that can...

Question 5

If the magnitude of vector A is less than the magnitude of vector B, then the x component of A is less than the x component of B.

Accepted Answer

A) True 
 B)False

Question 6

A vector   has components Ax y > 0, the angle that this vector makes with the positive x-axis must be in the range

Accepted Answer

A)  0° to 90°. 
B)  90° to 180°. 
C)  180° to 270°. 
D)  270° to 360°. 
A)  0° to 90°. 
B)  90° to 180°. 
C)  180° to 270°. 
D)  270° to 360°.

Question 7

A car and a truck are traveling in the same direction along a straight section of highway. The car is moving at 55. mph and the truck is moving 45. mph. What is the velocity of the truck relative to the car?

Accepted Answer

The answer of A car and a truck are traveling...

Question 8

In attempting to jump up a waterfall, a salmon leaves the water 2.0 m from the base of the waterfall. With what minimum speed must it leave the water in order just to make it up a waterfall 1.6 m high?

Accepted Answer

The answer of In attempting to jump up a waterfall,...

Question 9

A mortar shell is launched with a velocity of 100 m/s at an angle of 30.0° above horizontal from a point on a cliff 50.0 m above a level plain below. How far from the base of the cliff does the mortar shell strike the ground?

Accepted Answer

The answer of A mortar shell is launched with a...

Question 10

An arrow is shot, from a bow, at an original speed of vo. When it returns to the same horizontal level, its speed will be

Accepted Answer

A)  9.8 vo.  
B)  2 vo.  
C)  1/2 vo.  
D)  vo.  
E)  4 vo.  
A)  9.8 vo.  
B)  2 vo.  
C)  1/2 vo.  
D)  vo.  
E)  4 vo.

Question 11

Suppose Sammy Sosa hits a home run which travels 361. ft (110. m). Leaving the bat at 50 degrees above the horizontal, how high did it travel?

Accepted Answer

The answer of Suppose Sammy Sosa hits a home run...

Question 12

A vector   has components Ax = 12 m and Ay = 5.0 m. What is the magnitude of vector  ?

Accepted Answer

A)  13 m 
B)  17 m 
C)  21 m 
D)  60 m 
E)  7.0 m 
A)  13 m 
B)  17 m 
C)  21 m 
D)  60 m 
E)  7.0 m

Question 13

Lisa throws a stone horizontally from the roof edge of a 50. meter high dormitory. It hits the ground at a point 60. m from the building. Find the time of flight.

Accepted Answer

The answer of Lisa throws a stone horizontally from the...

Question 14

Janice throws a stone horizontally from the roof edge of a 50. meter high dormitory. It hits the ground at a point 60. m from the building. What was the initial velocity?

Accepted Answer

A)    g m/s 
B)  25. m/s 
C)  5.5 m/s 
D)  22. m/s 
E)  19. m/s 
A)    g m/s 
B)  25. m/s 
C)  5.5 m/s 
D)  22. m/s 
E)  19. m/s

Question 15

Daisy throws a rock horizontally with a speed of 12.0 m/s from a bridge. It falls 2.28 s before reaching the water below.
(a) When the rock hits the water it is traveling with what horizontal component of velocity? 
(b) What was the total speed just before hitting the water?

Accepted Answer

(a) 12.0 m

Question 16

Neglecting the effect of air friction, at what angle should a cannon be raised to achieve the greatest RANGE (horizontal distance)?

Accepted Answer

The answer of Neglecting the effect of air friction, at...

Question 17

Under which of the following conditions would a car have a westward acceleration?

Accepted Answer

A)  The car going eastward and its velocity is constant. 
B)  The car going eastward and its velocity is decreasing. 
C)  The car going eastward and its velocity is increasing. 
D)  The car going westward and its velocity is constant. 
E)  The car going westward and its velocity is decreasing. 
A)  The car going eastward and its velocity is constant. 
B)  The car going eastward and its velocity is decreasing. 
C)  The car going eastward and its velocity is increasing. 
D)  The car going westward and its velocity is constant. 
E)  The car going westward and its velocity is decreasing.

Question 18

-For the three vectors shown in Figure 3-7, determine  + -  .

Accepted Answer

85^x + 52^y (9

Question 19

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 travel

Accepted Answer

A)  one-sixth as far. 
B)    as far. 
C)  the same distance away. 
D)  6 times as far. 
E)  36 times as far. 
A)  one-sixth as far. 
B)    as far. 
C)  the same distance away. 
D)  6 times as far. 
E)  36 times as far.

Question 20

If you want to cross a river in a motorboat in the least amount of time (least time in water), you should head

Accepted Answer

A)  the time will be independent of how you head your boat 
B)  slightly downstream. 
C)  directly downstream. 
D)  slightly upstream. 
E)  straight across the river. 
A)  the time will be independent of how you head your boat 
B)  slightly downstream. 
C)  directly downstream. 
D)  slightly upstream. 
E)  straight across the river.

Exam 3: Motion in Two Dimensions

Suppose David Ortiz hits a home run which travels 361. feet (110. m). Assuming it left the bat at 50.°, how fast was it hit?

A pilot drops a bomb from a plane flying horizontally at a constant speed. When the bomb hits the ground, the horizontal location of the plane will

You toss a ball to a friend. When the ball reaches its maximum altitude, its acceleration

The driver of a motorboat that can move at 10 m/s wishes to travel directly across a narrow strait in which the current flows at 5 m/s. (a) At what angle upstream should the driver head the boat? (b) How long will it take to cross a distance of 1.6 km?

If the magnitude of vector A is less than the magnitude of vector B, then the x component of A is less than the x component of B.

A vector has components Ax < 0, and Ay > 0, the angle that this vector makes with the positive x-axis must be in the range

A car and a truck are traveling in the same direction along a straight section of highway. The car is moving at 55. mph and the truck is moving 45. mph. What is the velocity of the truck relative to the car?

In attempting to jump up a waterfall, a salmon leaves the water 2.0 m from the base of the waterfall. With what minimum speed must it leave the water in order just to make it up a waterfall 1.6 m high?

A mortar shell is launched with a velocity of 100 m/s at an angle of 30.0° above horizontal from a point on a cliff 50.0 m above a level plain below. How far from the base of the cliff does the mortar shell strike the ground?

An arrow is shot, from a bow, at an original speed of vo. When it returns to the same horizontal level, its speed will be

Suppose Sammy Sosa hits a home run which travels 361. ft (110. m). Leaving the bat at 50 degrees above the horizontal, how high did it travel?

A vector has components Ax = 12 m and Ay = 5.0 m. What is the magnitude of vector 11eea3cd_97cf_6a5c_97f4_87e191913ebf_TB9720_11?

Lisa throws a stone horizontally from the roof edge of a 50. meter high dormitory. It hits the ground at a point 60. m from the building. Find the time of flight.

Janice throws a stone horizontally from the roof edge of a 50. meter high dormitory. It hits the ground at a point 60. m from the building. What was the initial velocity?

Daisy throws a rock horizontally with a speed of 12.0 m/s from a bridge. It falls 2.28 s before reaching the water below. (a) When the rock hits the water it is traveling with what horizontal component of velocity? (b) What was the total speed just before hitting the water?

Neglecting the effect of air friction, at what angle should a cannon be raised to achieve the greatest RANGE (horizontal distance)?

Under which of the following conditions would a car have a westward acceleration?

-For the three vectors shown in Figure 3-7, determine +- .

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 travel

If you want to cross a river in a motorboat in the least amount of time (least time in water), you should head

Measurement and Problem Solving

Kinematics: Description of Motion

Force and Motion

Work and Energy

Linear Momentum and Collisions

Circular Motion and Gravitation

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Physical Optics: The Wave Nature of Light

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Relativity

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Filters

A vector has components A_x < 0, and A_y > 0, the angle that this vector makes with the positive x-axis must be in the range

An arrow is shot, from a bow, at an original speed of v_o. When it returns to the same horizontal level, its speed will be

A vector has components A_x = 12 m and A_y = 5.0 m. What is the magnitude of vector 11eea3cd_97cf_6a5c_97f4_87e191913ebf_TB9720_11?