Making Espresso Espresso is a coffee beverage made by forcing steam through finely ground coffee beans. Modern espresso makers generate steam at very high pressures and temperatures, but in this problem we'll consider a low-tech espresso machine that only
Magnetic Field near a Moving Charge
A particle with positive charge is moving with speed along the z axis toward positive . At the time
of this problem it is located at the origin,
. Your task is to find the magnetic field at
various locations in the thre
A Magnet and a Coil
When a magnet is plunged into a coil at speed , as shown in the figure, a voltage is induced in the coil
and a current flows in the circuit.
Part A If the speed of the magnet is doubled, the induced voltage is _ . Hint A.1 How to appro
Back to Square One
Four point charges form a square with sides of length , as shown in the figure. In the questions that
follow, use the constant
in place of
.
Part A What is the electric potential at the center of the square?
Make the usual assumption th
Homework 8-help Chap. 13 (notice, you may have different value in your mastering physics)
13.6. Model: The magnetic computer disk is a rigid rotating body.
Visualize:
Solve: Using the rotational kinematic equation f = i + t, we get
1 = 0 rad + (600 rad/s2
Homework8 Chapt. 11 & 12
Delivering Rescue Supplies You are a member of an alpine rescue team and must project a box of supplies, with mass , up
an incline of constant slope angle so that it reaches a stranded skier who is a vertical distance above the bo
Homework7-help 1/ the last part of Introduction of Collision Most real collisions are somewhere between elastic and perfectly inelastic. This is indicated by the elasticity E of the collision, which measures the difference in the velocities of the particl
Homework7 Chapt. 10 & 11
1/ the last part of Introduction of Collision Most real collisions are somewhere between elastic and perfectly inelastic. This is indicated by the elasticity E of the collision, which measures the difference in the velocities of t
9.17
The system has nonzero initial momentum pix. As Dan (D) jumps backward off the gliding skateboard (S), the skateboard will move forward in such a way that the final total momentum of the system pfx is equal to pix. This conservation of momentum occur
Homework 9 Chapt. 14 solutions (1) Cosine Wave
The graph shows the position of an oscillating object as a function of time . The equation of the graph is ,
Part A What is A in the equation?
Part B What is in the equation?
Part C What is in the equation?
F
Homework 9 Chapt. 12 & 14 help 12.11. Model: The disk is a rigid body rotating about an axis through its center.
Visualize:
Solve:
The speed of the point on the rim is given by vrim = R . The angular velocity of the disk can be determined
from its rotatio
14.4. Model: The air-track glider attached to a spring is in simple harmonic motion. Visualize: The position of the glider can be represented as x(t) = A cos t . Solve: The glider is pulled to the right and released from rest at t = 0 s . It then oscillat
16.24. Model: Treat the oxygen gas in the cylinder as an ideal gas.
Solve: (a) The number of moles of oxygen is
n=
M 50 g = = 1.563 mol Mmol 32 g mol
(b) The number of molecules is N = nN A = (1.563 mol ) 6.02 1023 mol 1 = 9.41 1023 . (c) The volume of th
20.12. Model: The wave is a traveling wave.
Solve: (a) A comparison of the wave equation with Equation 20.14 yields: A = 3.5 cm, k = 2.7 rad/m, = 124 rad/s, and 0 = 0 rad . The frequency is
f=
124 rad/s = = 19.7 Hz 2 2
b) The wavelength is: = 2
2 = = 2.3
Quiz 1 This is a photograph of an apple and feather free fall in a evacuated chamber. The apple and feather are released from the top. Suppose the camera opened flash every 1 s. (1) Suppose A1 is the distance from t = 0s to t = 1 s, A2 is the distance fro
Coulomb's Law Tutorial
Learning Goal: To understand how to calculate forces between charged particles, particularly the dependence on the sign of the charges and the distance between them. Coulomb's law describes the force that two charged particles exert
Electric Fields and Forces
Learning Goal: To understand Coulomb's law, electric fields, and the connection between the electric field and the electric force. Coulomb's law gives the electrostatic force acting between two charges. The magnitude of the
forc
Homework 6 Chapt 8 & 9
Accelerating along a Racetrack
Since acceleration is a vector quantity, an object moving at constant speed along a curved path has nonzero acceleration because the direction of its velocity v is changing, even though the magnitude o
Homework 5 help 1) A bullet is shot through two cardboard disks attached a distance D apart to a shaft turning with a rotational period T. The speed of bullet is 2 D V= T
7.24. Model: Model the child on the merry-go-round as a particle in nonuniform circu
Electric Force and Potential: Spherical Symmetry
Learning Goal: To understand the electric potential and electric field of a point charge in three dimensions Consider a positive point charge , located at the origin of three-dimensional space. Throughout t
Introduction to Electric Current
Learning Goal: To understand the nature of electric current and the conditions under which it exists. Electric current is defined as the motion of electric charge through a conductor. Conductors are materials that contain
Resistors in Parallel
A circuit contains a source of constant voltage and two resistors connected in parallel, as shown in
the figure. Resistor 1 has resistance
, and resistor 2 has resistance
.
Part A Which two of the following statements are true?
1. Th
Problem 33.4
An electron moves along the z-axis with . As it passes the origin, what are
the strength and direction of the magnetic field at the following ( ,
,
) positions?
Part A (1 ,0
,0
)
Express your answers using two significant figures.Enter your a
Basic Properties of Inductors
Learning Goal: To understand the units of inductance, the potential energy stored in an inductor, and some of the consequences of having inductance in a circuit. After batteries, resistors, and capacitors, the most common ele
Homework 2 Chapt. 23
23.15. Model: Represent the laser beam with a single ray and use the ray model of light.
Solve: Using Snells law at the air-water boundary,
nair sin air = nliquid sin liquid nliquid = nair
Assess: As expected, nliquid is larger than n
Homework 3 Chapt. 23 & 22
23.64. Model: Use ray tracing to locate the image. Assume the converging lens is a thin lens.
Solve: (a)
The figure shows the ray-tracing diagram using the steps of Tactics Box 23.2. After refraction, the three special rays conve
Phys. 2212 Homework Chap. 21
Solve:
21.7. Model: Reflections at the string boundaries cause a standing wave on the string. Figure EX21.7 indicates two full wavelengths on the string. Hence = 1 (60 cm) = 30 cm = 0.30 m. Thus 2
v = f = ( 0.30 m ) (100 Hz )
Chapter 12 Rotation of a Rigid Body
12.1 Rotational Motion 12.2 Center of Mass 12.3 Rotational energy 12.4 Moment of Inertia 12.5 Torque 12.6 Rotational dynamics 12.7 Rotation about a fixed axis 12.8 *Rigid-body equilibrium 12.9 Rolling Motion
Stop to thi
Chapter 14 Oscillations 1. To understand the physics and mathematics of oscillation. 2. To draw and interpret oscillatory graphs. 3. To learn the concepts of phase and phase constant 4. To understand and use energy conservation in oscillatory system 5. To
Chapter 16: Macroscopic Description of Matter Stop to think 16.2 Stop to think 16.3 Stop to think 16.5 Stop to think 16.6 Stop to think 16.7 Example 16.2 Example 16.3 Example 16.6 Example 16.10 page 485 page 487 page 494 page 498 page 498 page 485 page 49