5) A solid conducting sphere of radius 2.00 cm has a charge of 8.00uC. A conducting spherical shell of inner radius 4.00 cm and outer radius 5.00 cm is concentric with the solid sphere and has a charge of -4.00uC. Find the electric field at

a) r= 1.00 cm

b) r= 3.00 cm

c) r= 4.50 cm

d) r= 7.00 cm

from the center of this charge configuration.

A speaker at an open-air concert emits 500 W of sound power, radiated equally in all directions.

Part A:

What is the intensity of the sound 6.8 m from of the speaker?

Express your answer to two significant figures and include the appropriate units.

Part B:

What sound intensity level would you experience there if you did not have any protection for your ears?

Express your answer using two significant figures. Units must be in (dB)

Part C:

Earplugs you can buy in the drugstore have a noise reduction rating of 23 decibels. If you are wearing those earplugs but your friend Phil is not, how far from the speaker should Phil stand to experience the same loudness as you?

Express your answer to two significant figures and include the appropriate units.

1. Given two vectors such as

A⃗ =2x̂ +4ŷ +7ẑ

B⃗ =−3x̂ +8ŷ −2ẑ

what is their sum? What is its length, and what angle does it make to the plane of x and y? What is the dot product A⃗ ⋅B⃗

? What is the dot product of their sum with a unit vector in the z direction (A⃗ +B⃗ )⋅ẑ

? (Hint: this gives the z-component of the sum.).

2. When you apply a force of 100 N to a 25 kg box resting on a table, what is the smallest coefficient of static friction that will give a frictional force sufficient to prevent the box from moving? Suppose you push just a little harder and it starts to move. If the coefficient of kinetic friction is 0.1, how fast will it be going after 2 seconds of pushing?

3. If you walk up a mountain that is 1.5 km high (1500 meters), and your mass is 65 kg (your weight is about 143 lb of gravitational force at Earth's surface), how much energy do you use in joules to overcome Earth's gravity? How much would that be in food calories, where 1 calorie is 4.18 J and a "food" calorie is a kilocalorie in the units used by physicists and chemists. Similarly, if an object of your falls from low Earth orbit to Earth's surface, a distance of say 400 km which is the approximate height of the International Space Station orbit, how much kinetic energy would it have on reaching the Earth's surface -- assuming (a) it starts from rest, and (b) it does not lose energy to the atmosphere on the way down.

This is Introduction to PowerLab

1. a) Describe what is actually being recorded by the PowerLab and displayed in LabChart.

    b.) What is signal conditioning?

What phenomena can be explained using a wave model of light? Do this carefully and thoroughly. Be sure to state what property of the wave model leads to the explanation it provides. Link this property to the ray and Huygen’s diagrams you draw. DRAW DIAGRAM

I want important notes and equations in chapter 4 physics 1
Related topics:

1. contact forces

also for chapter 5:

1. applying newton's laws

2.applying newton's laws with constant-acceleration kinematics

1. A ball is thrown from the top of a 50 m high cliff with a velocity of 10 m/s @ 30o. a. What is the time to the maximum height and what is the max height? b. How long does the ball take to hit the ground? c. What is the velocity of the ball when it hits the ground? d. What is the horizontal range when the ball hits the ground (total x)?

2. Consider the initial velocity given in #1. What is the magnitude of the parallel and perpendicular components of acceleration for this velocity? What is changing faster, the direction or the magnitude of the initial velocity?

Three equal positive point charges of magnitude Q = 10.00μ C are located at three corners of a square of edge length d = 10.5 cm. A negative charge -30.00μ C is placed on the fourth corner. At the position of the negative charge, what is the magnitude of the electric field due to the three positive charges? What is the magnitude of the attractive force on the negative charge?

A coil is wrapped with 291 turns of wire on the perimeter of a square frame of sides 25.3 cm. Each turn has the same area, equal to that of the frame, and the total resistance of the coil is 2.05 Ohm. A uniform magnetic field is turned on perpendicular to the plane of the coil. If the field changes linearly from 0 to -0.0491 Wb/m2 in a time of 1.07 s, find the magnitude of the induced emf in the coil while the ?eld is changing. Answer in units of V

A canoe has a velocity of 0.470 m/s southeast relative to the earth. The canoe is on a river that is flowing at 0.510 m/s east relative to the earth. Find the direction of the velocity of the canoe relative to the river. Express your answer as an angle measured south of west.

An air conditioner draws 17 A at 220-V ac. The connecting cord is copper wire with a diameter of 1.291 mm .

a.) How much power does the air conditioner draw?

b.) If the length of the cord (containing two wires) is 6.5 m , how much power is dissipated in the wiring?

c.) If no. 12 wire, with a diameter of 2.053 mm, was used instead, how much power would be dissipated?

d.) Assuming that the air conditioner is run 13 h per day, how much money per month (30 days) would be saved by using no. 12 wire? Assume that the cost of electricity is 12 cents per kWh.

I have a question about difference between physical observables and eigenstates in quantum mechanics

it is postulated in Quantum Mechanics that

physical observable in Classical Mechanics are represented by linear operators

the state of the particle was represented by a curve in phase space determined by generalized position and momentum

but in Quantum Mechanics it is represented by a vector in Hilbert space

and if we measure the physical observable of the particle, the previous state of the particle once superpositioned with eigenstates of the physical observables

with the corresponding weighting factor(square of it is probability of yielding the result when measure) collapses to a single eigenstate and gives out the corresponding eigenvalue

but I don't understand what is the difference between physical observable represented by linear operator and the eigenstate of the particle

A point charge q1 = 4.25 nC is located on the x-axis at x = 2.20 m , and a second point charge q2 = -6.65 nC is on the y-axis at y = 1.30 m

What is the total electric flux due to these two point charges through a spherical surface centered at the origin and with radius r1 = 0.460 m ?

What is the total electric flux due to these two point charges through a spherical surface centered at the origin and with radius r2 = 1.70 m?

What is the total electric flux due to these two point charges through a spherical surface centered at the origin and with radius r3 = 3.00 m?

A 1 048-kg satellite orbits the Earth at a constant altitude of 101-km.

(a) How much energy must be added to the system to move the satellite into a circular orbit with altitude 208 km?
MJ

(b) What is the change in the system's kinetic energy?
MJ

(c) What is the change in the system's potential energy?
MJ