Question 1

If the magnitude of the cross product of two vectors is one-half the dot product of the same vectors,what is the angle between the two vectors?

Accepted Answer

The answer of If the magnitude of the cross product...

Question 2

The speed of a wave pulse on a string depends on the tension,F,in the string and the mass per unit length,μ,of the string.Tension has SI units of   and the mass per unit length has SI units of   What combination of F and μ must the speed of the wave be proportional to?

Accepted Answer

A)  F / μ 
B)  μ / F 
C)    
D)    
E)    
A)  F / μ 
B)  μ / F 
C)    
D)    
E)

Question 3

Vector   = 1.00   + -2.00   and vector   = 3.00   + 4.00   .What are the magnitude and direction of vector   =   +   ?

Accepted Answer

A)  7.21 in a direction 33.7° counterclockwise from the positive x axis 
B)  6.00 in a direction 63.4° counterclockwise from the positive x axis 
C)  4.47 in a direction 6.34° counterclockwise from the positive x axis 
D)  4.47 in a direction 26.6° counterclockwise from the positive x axis 
E)  7.21 in a direction 56.3° counterclockwise from the positive x axis 
A)  7.21 in a direction 33.7° counterclockwise from the positive x axis 
B)  6.00 in a direction 63.4° counterclockwise from the positive x axis 
C)  4.47 in a direction 6.34° counterclockwise from the positive x axis 
D)  4.47 in a direction 26.6° counterclockwise from the positive x axis 
E)  7.21 in a direction 56.3° counterclockwise from the positive x axis

Question 4

Approximately how many times does an average human heart beat in a lifetime?

Accepted Answer

A)  3 ×   
B)  3 ×   
C)  3 ×   
D)  3 ×   
E)  3 ×   
A)  3 ×   
B)  3 ×   
C)  3 ×   
D)  3 ×   
E)  3 ×

Question 5

A certain CD-ROM disk can store approximately 6.0 × 102 megabytes of information,where 106 bytes = 1 megabyte.If an average word requires 9.0 bytes of storage,how many words can be stored on one disk?

Accepted Answer

A)  6.7 × 107 words 
B)  5.4 × 109 words 
C)  2.1 × 107 words 
D)  2.0 × 109 words 
A)  6.7 × 107 words 
B)  5.4 × 109 words 
C)  2.1 × 107 words 
D)  2.0 × 109 words

Question 6

What is the sum of 1.53 + 2.786 + 3.3 written with the correct number of significant figures?

Accepted Answer

A)  8 
B)  7.6 
C)  7.62 
D)  7.616 
E)  7.6160 
A)  8 
B)  7.6 
C)  7.62 
D)  7.616 
E)  7.6160

Question 7

If two vectors point in opposite directions,their cross product must be zero.

Accepted Answer

A) True 
 B)False

Exam 1: Units,physical Quantities,and Vectors

If the magnitude of the cross product of two vectors is one-half the dot product of the same vectors,what is the angle between the two vectors?

The speed of a wave pulse on a string depends on the tension,F,in the string and the mass per unit length,μ,of the string.Tension has SI units of and the mass per unit length has SI units of What combination of F and μ must the speed of the wave be proportional to?

Vector = 1.00 + -2.00 and vector = 3.00 + 4.00 .What are the magnitude and direction of vector = + ?

Approximately how many times does an average human heart beat in a lifetime?

A certain CD-ROM disk can store approximately 6.0 × 102 megabytes of information,where 106 bytes = 1 megabyte.If an average word requires 9.0 bytes of storage,how many words can be stored on one disk?

What is the sum of 1.53 + 2.786 + 3.3 written with the correct number of significant figures?

If two vectors point in opposite directions,their cross product must be zero.

Motion Along a Straight Line

Motion in Two or Three Dimensions

Newtons Laws of Motion

Applying Newtons Laws

Work and Kinetic Energy

Potential Energy and Energy Conservation

Momentum,impulse,and Collisions

Rotation of Rigid Bodies

Dynamics of Rotational Motion

Equilibrium and Elasticity

Fluid Mechanics

Gravitation

Periodic Motion

Mechanical Waves

Sound and Hearing

Temperature and Heat

Thermal Properties of Matter

The First Law of Thermodynamics

The Second Law of Thermodynamics

Electric Charge and Electric Field

Gausss Law

Electric Potential

Capacitance and Dielectrics

Current,resistance,and Electromotive Force

Direct-Current Circuits

Magnetic Field and Magnetic Forces

Sources of Magnetic Field

Electromagnetic Induction

Inductance

Alternating Current

Electromagnetic Waves

The Nature and Propagation of Light

Geometric Optics

Interference

Diffraction

Relativity

Photons: Light Waves Behaving As Particles

Particles Behaving As Waves

Quantum Mechanics

Atomic Structure

Molecules and Condensed Matter

Nuclear Physics

Particle Physics and Cosmology

Filters

A certain CD-ROM disk can store approximately 6.0 × 10² megabytes of information,where 10⁶ bytes = 1 megabyte.If an average word requires 9.0 bytes of storage,how many words can be stored on one disk?