BuyFind

Physical Chemistry

2nd Edition
Ball + 3 others
Publisher: Wadsworth Cengage Learning,
ISBN: 9781133958437
BuyFind

Physical Chemistry

2nd Edition
Ball + 3 others
Publisher: Wadsworth Cengage Learning,
ISBN: 9781133958437

Solutions

Chapter
Section
Chapter 2, Problem 2.1E
Textbook Problem

Calculate the work performed by a person who exerts a force of 30 N(N =  newtons) to move a box 30 meters if the force were (a) exactly parallel to the direction of movement, and (b)45° to the direction of movement. Do the relative magnitudes make sense?

Expert Solution
Interpretation Introduction

(a)

Interpretation

To calculate the work performed by a person who exerts a force of 30N to move a box 30 meters if the force were exactly parallel to the direction of movement.

Concept introduction

The work is performed on an object when an object moves a certain distance s due to the force F. Mathematically, it is indicated by the dot product of the force vector F and the distance vector s. The mathematical equation is given below,

Work = F.s = |F||s| cos Ѳ

Where Ѳ is the angle between the vectors F and s. The unit of work is joules. Work is a way to transfer the energy. The energy is defined as the ability to do work and so energy and work are described using the same unit in joules.

Answer to Problem 2.1E

Work exactly parallel to the direction of movement = 900 J

Explanation of Solution

The work is defined as force x displacement [distance].

In the given question

work = 30N

distance = 30m

Work = F.s

Therefore work = 30 N.30 m= 900 J

Conclusion

Thus the Work exactly parallel to the direction of movement = 900 J

Expert Solution
Interpretation Introduction

(b)

Interpretation

To calculate the work performed by a person who exerts a force of 30N to move a box 30 meters if the force were 45° to the direction of movement.

Concept introduction

The work is performed on an object when an object moves a certain distance s due to the force F. Mathematically, it is indicated by the dot product of the force vector F and the distance vector s. The mathematical equation is given below,

Work = F.s = |F||s| cos Ѳ

Where Ѳ is the angle between the vectors F and s. The unit of work is joules. Work is a way to transfer the energy. The energy is defined as the ability to do work and so energy and work are described using the same unit in joules.

Answer to Problem 2.1E

Work were 45° to the direction of movement = 640 J

Explanation of Solution

The work is defined as force x displacement [distance].

In the given question

work = 30N

degree = 45°

Work = F.s = |F||s| cos Ѳ

Therefore work = 30 N. 30m cos 45°

= 30 x 30 x0.71

Work = 640 J

Conclusion

Thus the work at 45° to the direction of movement = 640 J

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Chapter 2 Solutions

Physical Chemistry
Ch. 2 - There is 3930 J of energy added to a 79.8-g sample...Ch. 2 - If the heat capacity varies withtemperature,...Ch. 2 - Liquid hydrogen fluoride, liquid water,and liquid...Ch. 2 - A 5-mmdiameter hailstone has a terminal velocity...Ch. 2 - A7.50-gpiece of iron at 100.0C is dropped into...Ch. 2 - With reference to Joules apparatus inFigure2.6,...Ch. 2 - Verify equation2.8.Ch. 2 - True or false: Althoughwork done bya free...Ch. 2 - What arethe differencesbetween an open, a closed,...Ch. 2 - The statement Energycan beneithercreatednor...Ch. 2 - Explain why equation 2.10 is not considered a...Ch. 2 - What is the change in internal energy when a gas...Ch. 2 - Calculate the work for the isothermal, reversible...Ch. 2 - Calculate the work donewhen 1.000 mole of an ideal...Ch. 2 - Apistonhaving0.033 mol of gas at 35.0C expands...Ch. 2 - Supposea change in agaseous system is adiabatic...Ch. 2 - Indicate which state function is equal to heat, q,...Ch. 2 - The distance between downtown San Francisco and...Ch. 2 - Is temperature astate function?Defend your answer.Ch. 2 - A piston reversibly and adiabatically contracts...Ch. 2 - Calculate U when 1.00 mol of H2 goes from 1.00...Ch. 2 - Many compressed gases come in large,heavy metal...Ch. 2 - Under what conditions will U be exactly zero for a...Ch. 2 - Aballoon filled with 0.505 mole of gascontracts...Ch. 2 - A piston having 7.23 g of steam at 110 C increases...Ch. 2 - It takes 2260 J to vaporize a gram of liquid water...Ch. 2 - True or false: Any process for which H is negative...Ch. 2 - If the infinitesimals of internal energy were...Ch. 2 - A refrigerator contains approximately 17cubic...Ch. 2 - In a constant-volume calorimeter, 35.0g of H2cools...Ch. 2 - A 2.50-mol sample of gas is compressed...Ch. 2 - A 244-g amount of coffee in an open plastic cup...Ch. 2 - What arethe units on each termof the equation for...Ch. 2 - Starting with equation 2.27 andthe original...Ch. 2 - Derive the fact that HpT is also zero for an ideal...Ch. 2 - Define isobaric,isochoric, isenthalpic,and...Ch. 2 - Starting from the cyclicrule involvingthe Joule-...Ch. 2 - The ideal gas law is theequation of state for an...Ch. 2 - For a gasthat follows the van der Waals equation...Ch. 2 - Estimatethe final temperature of a mole of gas at...Ch. 2 - With regard to exercise 2.50, how accurate do you...Ch. 2 - Use the data in Table 2.2 to determine Hp T for Ar...Ch. 2 - Use the data in Table 2.2 to determine PH T for N2...Ch. 2 - Someone proposes thatthe Joule-Thomson coefficient...Ch. 2 - Why is equation2.37 written interms of CV and Cp...Ch. 2 - What are the numerical values of the heat...Ch. 2 - In a constant-pressure calorimeter that is, one...Ch. 2 - What is the finaltemperature of0.122 mole...Ch. 2 - Derive equation 2.44 from the previous step.Ch. 2 - Show that =5/3 for a monatomic ideal gas.Ch. 2 - What is for an ideal diatomic gas?Ch. 2 - The parameter varies with temperature for...Ch. 2 - A 1.00 mol sample of H2 is carefully warmed from...Ch. 2 - Asampleof a monatomic ideal gas doubles itsvolume...Ch. 2 - A sample of an ideal diatomic gas is compressed...Ch. 2 - In orbit about Earth, a weather balloonjettisons a...Ch. 2 - Derive the general equation presented in Example...Ch. 2 - Comparethe answers from Examples 2.13 and2.14....Ch. 2 - If pumping up an automobile tire is assumed to be...Ch. 2 - The speed of sound in a gas is related to the...Ch. 2 - Take the volume change into account and calculate...Ch. 2 - How much work is performed by 1 mole of water...Ch. 2 - Why are steam burns so much worse than water burns...Ch. 2 - How many grams of water at 0C will be melted by...Ch. 2 - Draw a diagram like Figure 2.11 that illustrates...Ch. 2 - Determine the rxnH(25C) of the following reaction:...Ch. 2 - Determine rxnH 25 C for the following reaction: NO...Ch. 2 - The enthalpy of combustion of...Ch. 2 - The enthalpy of combustion of diamond is -395.4...Ch. 2 - Using Hesss law, writeout allof the formation...Ch. 2 - Sublimation is the phase change from solid to gas...Ch. 2 - The thermite reaction combines aluminum powder and...Ch. 2 - Benzoic acid, C6H5COOH, is a common standard used...Ch. 2 - Assume that 1.20 g of benzoicacid, C6H5COOH, is...Ch. 2 - Natural gas is mostly CH4. When it burns, the...Ch. 2 - Assuming constant heatcapacities for products and...Ch. 2 - Use the heat capacities of the products and...Ch. 2 - The following are values of heat capacity for...Ch. 2 - What is U for 1 mole of N2 gas going from 300 K to...Ch. 2 - Consider a gas undergoing a reversible, adiabatic...Ch. 2 - The Dieterici equation of state for one mole of...Ch. 2 - H2 gas has a single vibrational frequency of 1.295...Ch. 2 - Find the enthalpies of the combustion reactions...

Additional Science Textbook Solutions

Find more solutions based on key concepts
The word DETERMINE is an acronym used in assessing an elderly person's.. a. risk of malnutrition b. bone integr...

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

How do eating disorders affect health?

Understanding Nutrition (MindTap Course List)

What is the difference between artificial selection and natural selection?

Biology: The Dynamic Science (MindTap Course List)

Which groups or protists would you be most likely to find as fossils? Why?

Biology: The Unity and Diversity of Life (MindTap Course List)

When the metal ring and metal sphere in Figure CQ19.8 are both at room temperature, the sphere can barely be pa...

Physics for Scientists and Engineers, Technology Update (No access codes included)

Draw a particulate-level sketch of a heterogeneous pure substance.

Introductory Chemistry: An Active Learning Approach

What is unique about picoplankton?

Oceanography: An Invitation To Marine Science, Loose-leaf Versin