Question 1

Consider a thrown ball which has reached its highest point in flight. The magnitude of the acceleration

Accepted Answer

A)  reverses direction. 
B)  is 2*g. 
C)  is zero. 
D)  is less than it will be a short instant later. 
E)  is g. 
A)  reverses direction. 
B)  is 2*g. 
C)  is zero. 
D)  is less than it will be a short instant later. 
E)  is g.

Question 2

Johnny throws a shotput at an angle of 45.° and it travels a horizontal distance of 30. meters. If he releases the shotput at the same speed but changes the angle to 55.°, what will be the new range (distance)?

Accepted Answer

A)  37. m 
B)  25. m 
C)  28. m 
D)  41. m 
E)  32. m 
A)  37. m 
B)  25. m 
C)  28. m 
D)  41. m 
E)  32. m

Question 3

Three boys each pull with a 20-lb force on the same object, as shown in Figure 3-5.
Figure 3-5
 
 The resultant force will be

Accepted Answer

A)  20 lb to the left. 
B)  zero. 
C)  20 lb down. 
D)  20 lb up. 
E)  cannot be determined; insufficient information 
A)  20 lb to the left. 
B)  zero. 
C)  20 lb down. 
D)  20 lb up. 
E)  cannot be determined; insufficient information

Question 4

You toss a ball to your friend. The ball reaches its maximum altitude

Accepted Answer

A)  in half of the time it is in the air. 
B)  in less than half the time it is in the air. 
C)  in more than half the time it is in the air. 
A)  in half of the time it is in the air. 
B)  in less than half the time it is in the air. 
C)  in more than half the time it is in the air.

Question 5

A bullet left the muzzle of a gun at 150. m/s and attains a height of 0.57 km. Initially the velocity was angled how many degrees above the horizontal?

Accepted Answer

The answer of A bullet left the muzzle of a...

Question 6

The sum of two vectors has the smallest magnitude when the angle between these two vectors is

Accepted Answer

The answer of The sum of two vectors has the...

Question 7

An electron, initially moving at 2.0 × 104 m/s along the +x-axis, experiences a constant acceleration of 1010 m/s2 in the +y direction. How far from its starting point is the electron after 4.0 × 10-6 seconds?

Accepted Answer

A)  8.0 m 
B)  11.3 m 
C)  11.3 cm 
D)  8.0 cm 
E)  9.8 m 
A)  8.0 m 
B)  11.3 m 
C)  11.3 cm 
D)  8.0 cm 
E)  9.8 m

Question 8

A 200-lb force is pulling on an object, as shown in Figure 3-1.
Figure 3-1
  
The sign of the x and y components of the force are

Accepted Answer

A)  x (negative), y (negative). 
B)  x (positive), y (positive). 
C)  x (negative), y (positive). 
D)  x (positive), y (negative). 
A)  x (negative), y (negative). 
B)  x (positive), y (positive). 
C)  x (negative), y (positive). 
D)  x (positive), y (negative).

Question 9

The magnitude of a vector is 3.1 units and its x component is 0 units. What are the possible y components and respective angles with the x-axis of the vector?

Accepted Answer

3.1 at 90.

Question 10

Suppose that several projectiles are fired upward. Which one will be in the air longest? (R is range, h is highest elevation, and t is time of flight.)

Accepted Answer

A)  The one with the highest maximum elevation, h 
B)  The one with the greatest initial velocity 
C)  The one with the minimum elevation, h 
D)  The one with the farthest range, R 
E)  The one for which the product of (R)(t)(h) is maximum 
A)  The one with the highest maximum elevation, h 
B)  The one with the greatest initial velocity 
C)  The one with the minimum elevation, h 
D)  The one with the farthest range, R 
E)  The one for which the product of (R)(t)(h) is maximum

Question 11

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 will

Accepted Answer

A)  be constant. 
B)  depend on their weight. 
C)  decrease. 
D)  be gt2. 
E)  increase. 
A)  be constant. 
B)  depend on their weight. 
C)  decrease. 
D)  be gt2. 
E)  increase.

Question 12

A hunter points a rifle horizontally 3.30 m above the ground. The bullet leaves the barrel at 325. m/s.
(a) How long did it take for the bullet to strike the ground?
(b) How far horizontally did it travel?

Accepted Answer

(a) 0.821

Question 13

You hit a handball too hard, and it lands horizontally on top of a roof. If its original velocity was vo at an angle $\theta$above the horizontal, then it lands on the roof with a velocity of

Accepted Answer

A)  vo sin $\theta$ 
B)  zero 
C)  vo cos $\theta$ 
D)  2 vo 
E)   vo 
A)  vo sin $\theta$ 
B)  zero 
C)  vo cos $\theta$ 
D)  2 vo 
E)   vo

Question 14

How high does a bullet travel after leaving the barrel of a rifle at 225. m/s with
an angle of 66.° above the horizontal? Also what is its range (ignore air friction)?

Accepted Answer

2.2 km hei

Question 15

-For the three vectors given in Figure 3-7, determine the vector "difference"  -  -  .

Accepted Answer

The answer of  
-For the three vectors given in...

Question 16

Which of the following operations will not change a vector?

Accepted Answer

A)  Multiply it by a constant factor. 
B)  Rotate it. 
C)  Subtract a constant vector from it. 
D)  Translate it parallel to itself. 
E)  Add a constant vector to it. 
A)  Multiply it by a constant factor. 
B)  Rotate it. 
C)  Subtract a constant vector from it. 
D)  Translate it parallel to itself. 
E)  Add a constant vector to it.

Question 17

Two displacement vectors have magnitudes of 5 m and 7 m, respectively. When these two vectors are added, the magnitude of the sum

Accepted Answer

A)  is larger than 12 m. 
B)  could be as small as 2 m, or as large as 12 m. 
C)  is exactly 2 m. 
D)  is exactly 12 m. 
E)  is exactly 6 m. 
A)  is larger than 12 m. 
B)  could be as small as 2 m, or as large as 12 m. 
C)  is exactly 2 m. 
D)  is exactly 12 m. 
E)  is exactly 6 m.

Question 18

A plane flying horizontally at a speed of 50.0 m/s and at an elevation of 160. m drops a package of supplies. Two seconds later it drops a second package. How far apart will the two packages land on the ground?

Accepted Answer

A)  162. m 
B)  177. m 
C)  67.7 m 
D)  100. m 
E)  283. m 
A)  162. m 
B)  177. m 
C)  67.7 m 
D)  100. m 
E)  283. m

Question 19

Consider two vectors A and B in Figure 3-4:
Figure 3-4
  
The difference B -A is

Accepted Answer

A)  choice (a). 
B)  choice (b). 
C)  choice (c). 
D)  choice (d). 
A)  choice (a). 
B)  choice (b). 
C)  choice (c). 
D)  choice (d).

Question 20

A basketball is thrown with a velocity of 20. m/s at an angle of 60.° above the horizontal. What is the horizontal component of its instantaneous velocity at the exact top of its trajectory? (Neglect air friction.)

Accepted Answer

A)  10. m/s 
B)  20. m/s 
C)  zero 
D)  17.3 m/s 
E)  20. tan(60°) m/s 
A)  10. m/s 
B)  20. m/s 
C)  zero 
D)  17.3 m/s 
E)  20. tan(60°) m/s

Exam 3: Motion in Two Dimensions

Consider a thrown ball which has reached its highest point in flight. The magnitude of the acceleration

Johnny throws a shotput at an angle of 45.° and it travels a horizontal distance of 30. meters. If he releases the shotput at the same speed but changes the angle to 55.°, what will be the new range (distance)?

Three boys each pull with a 20-lb force on the same object, as shown in Figure 3-5. Figure 3-5 The resultant force will be

You toss a ball to your friend. The ball reaches its maximum altitude

A bullet left the muzzle of a gun at 150. m/s and attains a height of 0.57 km. Initially the velocity was angled how many degrees above the horizontal?

The sum of two vectors has the smallest magnitude when the angle between these two vectors is

An electron, initially moving at 2.0 × 104 m/s along the +x-axis, experiences a constant acceleration of 1010 m/s2 in the +y direction. How far from its starting point is the electron after 4.0 × 10-6 seconds?

A 200-lb force is pulling on an object, as shown in Figure 3-1. Figure 3-1 The sign of the x and y components of the force are

The magnitude of a vector is 3.1 units and its x component is 0 units. What are the possible y components and respective angles with the x-axis of the vector?

Suppose that several projectiles are fired upward. Which one will be in the air longest? (R is range, h is highest elevation, and t is time of flight.)

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 will

A hunter points a rifle horizontally 3.30 m above the ground. The bullet leaves the barrel at 325. m/s. (a) How long did it take for the bullet to strike the ground? (b) How far horizontally did it travel?

You hit a handball too hard, and it lands horizontally on top of a roof. If its original velocity was vo at an angle θ\thetaθ above the horizontal, then it lands on the roof with a velocity of

How high does a bullet travel after leaving the barrel of a rifle at 225. m/s with an angle of 66.° above the horizontal? Also what is its range (ignore air friction)?

-For the three vectors given in Figure 3-7, determine the vector "difference" - - .

Which of the following operations will not change a vector?

Two displacement vectors have magnitudes of 5 m and 7 m, respectively. When these two vectors are added, the magnitude of the sum

A plane flying horizontally at a speed of 50.0 m/s and at an elevation of 160. m drops a package of supplies. Two seconds later it drops a second package. How far apart will the two packages land on the ground?

Consider two vectors A and B in Figure 3-4: Figure 3-4 The difference B -A is

A basketball is thrown with a velocity of 20. m/s at an angle of 60.° above the horizontal. What is the horizontal component of its instantaneous velocity at the exact top of its trajectory? (Neglect air friction.)

Measurement and Problem Solving

Kinematics: Description of Motion

Force and Motion

Work and Energy

Linear Momentum and Collisions

Circular Motion and Gravitation

Rotational Motion and Equilibrium

Solids and Fluids

Temperature and Kinetic Theory

Heat

Thermodynamics

Vibrations and Waves

Sound

Electric Charge, Forces, and Fields

Electric Potential, Energy, and Capacitance

Electric Current and Resistance

Basic Electric Circuits

Magnetism

Electromagnetic Induction and Waves

AC Circuits

Reflection and Refraction of Light

Mirrors and Lenses

Physical Optics: The Wave Nature of Light

Vision and Optical Instruments

Relativity

Quantum Physics

Quantum Mechanics and Atomic Physics

The Nucleus

Nuclear Reactions and Elementary Particles

Filters

An electron, initially moving at 2.0 × 10⁴ m/s along the +x-axis, experiences a constant acceleration of 1010 m/s² in the +y direction. How far from its starting point is the electron after 4.0 × 10^-6 seconds?

You hit a handball too hard, and it lands horizontally on top of a roof. If its original velocity was v_o at an angle $\theta$ above the horizontal, then it lands on the roof with a velocity of