1. A 3.00 kg piece of lead at 90 C is dropped into a lake at 10 C. Find the
entropy change of the lake, the lead and the universe.
Answer:
The lakes temperature does not change. The lead transfers
Qla
CHAPTER
23
The Electric Field II: Continuous Charge Distributions
1* A uniform line charge of linear charge density ? = 3.5 nC/m extends from x = 0 to x = 5 m. (a) What is the total charge? Find the e
CHAPTER
22
The Electric Field I: Discrete Charge Distributions
1* If the sign convention for charge were changed so that the charge on the electron were positive and the charge on the proton were nega
CHAPTER
21
Thermal Properties and Processes
1* Why does the mercury level first decrease slightly when a thermometer is placed in warm water? The glass bulb warms and expands first, before the mercury
CHAPTER
19
Heat and the First Law of Thermodynamics
1* Body A has twice the mass and twice the specific heat of body B. If they are supplied with equal amounts of heat, how do the subsequent changes i
CHAPTER
18
Temperature and the Kinetic Theory of Gases
1* True or false: (a) Two objects in thermal equilibrium with each other must be in thermal equilibrium with a third object. (b) The Fahrenheit a
CHAPTER
17
WaveParticle Duality and Quantum Physics
1* The quantized character of electromagnetic radiation is revealed by (a) the Young double -slit experiment. (b) diffraction of light by a small ap
CHAPTER
16
Superposition and Standing Waves
1* True or false: (a) The waves from two coherent sources that are radiating in phase interfere constructively everywhere in space. (b) Two wave sources tha
CHAPTER
15
Wave Motion
1* A rope hangs vertically from the ceiling. Do waves on the rope move faster, slower, or at the same speed as they move from bottom to top? Explain. They move faster as they mo
CHAPTER
14
Oscillations
1* Deezo the Clown slept in again. As he roller-skates out the door at breakneck speed on his way to a lunchtime birthday party, his superelastic suspenders catch on a fence po
CHAPTER
24
Electric Potential
1*
A uniform electric field of 2 kN/C is in the x direction. A positive point charge Q = 3 C is released from rest at
the origin. (a) What is the potential difference V(
CHAPTER
25
Electrostatic Energy and Capacitance
1* Three point charges are on the x axis: q 1 at the origin, q 2 at x = 3 m, and q 3 at x = 6 m. Find the electrostatic potential energy for (a) q 1 = q
p275 recitation 10/18/2017 answers
1. Consider a clock driven by a pendulum made of a (massless!) brass rod with a small but heavy
lump of stuff at its lower end. If it keeps good time when the temper
1. A water cooled electric power plant generates 50 MW of power. Its efficiency is
38%. What must the flow rate of the cooling water be if the water may not warm
more than 9 C in the process?
Answer:
(If you have any questions about these solutions please email me or drop in and ask)
Sept 13 answers
1. An object, mass 2.0 kg, velocity 20 m/sec in the direction perpendicular to a wall, hits
that wa
CHAPTER Alternating-Current Circuits
31
Note: Unless otherwise indicated, the symbols I, V, E, and P denote the rms values of I, V, and E and the average power. 1* A 200-turn coil has an area of 4 cm2
CHAPTER Magnetic Induction
30
1* A uniform magnetic field of magnitude 2000 G is parallel to the x axis. A square coil of side 5 cm has a single turn and makes an angle ? with the z axis as shown in F
CHAPTER Sources of the Magnetic Field
29
1* Compare the directions of the electric and magnetic forces between two positive charges, which move along parallel paths (a) in the same direction, and (b)
CHAPTER The Magnetic Field
28
1* When a cathode-ray tube is placed horizontally in a magnetic field that is directed vertically upward, the electrons emitted from the cathode follow one of the dashed
CHAPTER
27
The Microscopic Theory of Electrical Conduction
1* In the classical model of conduction, the electron loses energy on average in a collision because it loses the drift velocity it had picke
CHAPTER
26
Electric Current and Direct-Current Circuits
1* In our study of electrostatics, we concluded that there is no electric field within a conductor in electrostatic equilibrium. How is it that
CHAPTER
13
Fluids
1* A copper cylinder is 6 cm long and has a radius of 2 cm. Find its mass. Find the volume, then m = V V = r2h = 75.4 10-6 m3; m = 8.93 103V = 0.673 kg 2 Find the mass of a lead sphe
CHAPTER
12
Static Equilibrium and Elasticity
1* True or false: (a) F = 0 is sufficient for static equilibrium to exist. (b) F = 0 is necessary for static equilibrium to exist. (c) In static equilibriu
CHAPTER
41
Elementary Particles and the Beginning of the Universe
1* How are baryons and mesons similar? How are they different? Similarities: Baryons and mesons are hadrons, i.e., they participate in
CHAPTER Nuclear Physics
40
1* Give the symbols for two other isotopes of (a) 14N, (b) 56Fe, and (c) 118Sn (a) 15N, 16N; (b) 54Fe, 55Fe; (c) 114Sn, 116Sn 2 Calculate the binding energy and the binding
CHAPTER
39
Relativity
1* You are standing on a corner and a friend is driving past in an automobile. Both of you note the times when the car passes two different intersections and determine from your
CHAPTER
38
Molecules and Solids
1*Would you expect the NaCl molecule to be polar or nonpolar? NaCl is a polar molecule. 2 3 4 Would you expect the N2 molecule to be polar or nonpolar? N2 is a non-pola
CHAPTER Atoms
37
1* As n increases, does the spacing of adjacent energy levels increase or decrease? The spacing decreases. 2 The energy of the ground state of doubly ionized lithium (Z = 3) is _ ,whe
CHAPTER
36
Applications of the Schrdinger Equation
1* True or false: Boundary conditions on the wave function lead to energy quantization. True 2 Sketch (a) the wave function and (b) the probability d
CHAPTER Interference and Diffraction
35
1* When destructive interference occurs, what happens to the energy in the light waves? The energy is distributed nonuniformly in space; in some regions the ene