CHAPTER
25
Electrostatic Energy and Capacitance
1* Three point charges are on the x axis: q1 at the origin, q2 at x = 3 m, and q3 at x = 6 m. Find the electrostatic potential energy for (a) q1 = q2 = q3 = 2 C, (b) q1 = q2 = 2 C and q3 = 2 C, and
CHAPTER
1
Systems of Measurement
1*
Which of the following is not one of the fundamental physical quantities in the SI system?
(a) mass (b) length (c) force (d) time (e) All of the above are fundamental physical quantities. (c) Force is not a f
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(4 m) V(0)? (b) What is the change in the pot
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 and Celsius temperature scales differ only in t
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 post, and he flies back and forth, oscillating w
CHAPTER
9
Rotation
1* Two points are on a disk turning at constant angular velocity, one point on the rim and the other halfway between the rim and the axis. Which point moves the greater distance in a given time? Which turns through the greater
CHAPTER
21
Thermal Properties and Processes
1* 2
Why does the mercury level first decrease slightly when a thermometer is placed in warm water? A large sheet of metal has a hole cut in the middle of it. When the sheet is heated, the area of the
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 move up because the tension increases due to the
CHAPTER
4
Newton's Laws
Note: For all problems we shall take the upward direction as positive unless otherwise stated. 1* 2 How can you tell if a particular reference frame is an inertial reference frame? Suppose you find that an object in a par
CHAPTER
5
Applications of Newton's Laws
1* Various objects lie on the floor of a truck moving along a horizontal road. If the truck accelerates, what force acts on the objects to cause them to accelerate? Force of friction between the objects and
CHAPTER
6
Work and Energy
1* True or false: (a) Only the net force acting on an object can do work. (b) No work is done on a particle that remains at rest. (c) A force that is always perpendicular to the velocity of a particle never does work on
36.1. Model: S and S are inertial frames that overlap at t = 0. Frame S moves with a speed v = 5 m/s along the
x-direction relative to frame S. Visualize:
The figure shows a pictorial representation of the S and S frames at t = 1 s and 5 s. Solve: From th
37.1. Visualize: By showing that a current is collected only when the cathode-ray green spot is on the
electrode, this was the first conclusive demonstration that cathode rays consist of negatively charged particles.
37.2. Visualize: Cathode rays emitted
38.1. Model: The photoelectric current depends on the potential V between the two electrodes, the nature of
the cathode metal, and the intensity of the light. Visualize: (a) When V > 0, all the emitted electrons are attracted to and collected by the anode
39.1. Model: The sum of the probabilities of all possible outcomes must equal 1 (100%).
Solve: The sum of the probabilities is PA + PB + PC + PD = 1. Hence, 0.40 + 0.30 + PC + PD = 1 PC + PD = 0.30 Because PC = 2PD, 2PD + PD = 0.30. This means PD = 0.10 a
Solve: Absorption occurs from the ground state n = 1. Its reasonable to assume that the transition is from n = 1 to n = 2. The energy levels of an electron in a rigid box are h2 En = n 2 8mL2 The absorbed photons must have just the right energy, so hc 3h
41.1. Solve: (a) A 4p state corresponds to n = 4 and l = 1. From Equation 41.3, the orbital angular momentum
is L = 1(1 + 1)h = 2 h . (b) In the case of a 5f state, n = 5 and l = 3. So, L = 3(3 + 1)h = 12 h.
41.2. Solve: (a) Excluding spin, a state is des
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, CA = 4CB; TA = TB/4
how do the subsequent changes in their temperatures com
CHAPTER
7
Conservation of Energy
1* What are the advantages and disadvantages of using the conservation of mechanical energy rather than Newton's laws to solve problems? Generally simpler, involving only scalars; cannot obtain some details, e.g.,
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 Figure 30-28. Find the magnetic flux through the
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. 2 1* A 200-turn coil has an area of 4 cm and rotates in a magnetic field of 0.5 T. (a)
CHAPTER
10
Conservation of Angular Momentum
1* True or false: (a) If two vectors are parallel, their cross product must be zero. (b) When a disk rotates about its symmetry axis, is along the axis. (c) The torque exerted by a force is always perp
CHAPTER Properties of Light
33
1* Why is helium needed in a heliumneon laser? Why not just use neon? The population inversion between the state E2,Ne and the state 1.96 eV below it (see Figure 33-9) is achieved by inelastic collisions between neon
CHAPTER
8
Systems of Particles and Conservation of Momentum
1* Give an example of a three-dimensional object that has no mass at its center of mass. A hollow sphere. 2 Three point masses of 2 kg each are located on the x axis at the origin, x =
CHAPTER
20
The Second Law of Thermodynamics
1*
Where does the energy come from in an internal-combustion engine? In a steam engine? steam.
Internal combustion engine: From the heat of combustion (see Problems 19-106 to 19-109). Steam engine: Fr
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 equilibrium, the net torque about any point is zero. (
CHAPTER
2
Motion in One Dimension
1*
What is the approximate average velocity of the race cars during the Indianapolis 500?
Since the cars go around a closed circuit and return nearly to the starting point, the displacement is nearly zero, and
CHAPTER
11
Gravity
1* True or false: (a) Kepler's law of equal areas implies that gravity varies inversely with the square of the distance. (b) The planet closest to the sun, on the average, has the shortest period of revolution about the sun. (a
CHAPTER Maxwell's Equations and Electromagnetic Waves
32
1* A parallel-plate capacitor in air has circular plates of radius 2.3 cm separated by 1.1 mm. Charge is flowing onto the upper plate and off the lower plate at a rate of 5 A. (a) Find the t
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 negative, would Coulomb's law still be written the