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# Energy

### Rotational Motion Diagram

Please refer to the attachment for questions complete with diagrams. 1. The spool has a weight of 400 lb and a radius of gyration of kG = 1.6 ft. A horizontal force of P = 12 lb is applied to the cable wrapped around its inner core. If the spool is originally at rest, determine its angular velocity after the spool has turned

### Refraction of Material, DC Motor Current, Defibrillator & Speed

1. A light ray in material 1 goes into material 2. The angle of incidence in material 1 is 40.0o and the angle of refraction in material 2 is 31.0o. If the index of refraction of material 1 is 1.60, what is the index of refraction of material 2? 2. A dc motor has coils with a resistance of 16 and is connected to an emf of 12

### Transitions in the hydrogen atom; emission lines, absorption spectrum

Please show all work. 1. For each of the following transitions in he hydrogen atom, calculate the energy, frequency, and wavelength of the associated radiation, and determine whether the radiation is emitted or absorbed. a. n=5 to n=1 b. n=4 to n=6 2. One of the emission lines of the hydrogen atom spectrum has a wave

### Electron Potential Energy; Speed of Proton Particle and Electron

Please show work in detail. What is the electron potential energy in joules of of two electrons separated by 2.33nm? and what would it be if the separation was doubled? A charged proton particle is moving rightward between two parallel charged plates separated by distance d= 6.60mm. The plate potentials are V1= -67.0 v an

### Analysis of Capacitance

The physics behind electro caridio gram is examined. The capacitance between two 4cm^2 square electrodes spaced 0.6mm apart connected to a 400V battery is determined. The charge stored is then determined A pair of 10uF capaciators in a high powered laser are charges to 1.7 kV and the charge and energy stored is determined

### Physics: Harmonic motion

Which one of the following quantities is at a maximum when an object in simple harmonic motion is at its maximum displacement? a. speed b. acceleration c. kinetic energy d. frequency 7. An object moving in simple harmonic motion has an amplitude of 0.020 m and a maximum acceleration of 40 m/s2. What is the frequency of th

What is the final delivered electricity in kWh by burning one pound of coal (13, 100 BTU) with a boiler loss of 20%, generator loss of 50%, and transmission loss of 2%? a) What is the KJ equivalence to 13, 100 BTU? b) What is the final delivered energy in KJ? c) What is the final delivered energy kWh?

### How electrons move in conductors; how diodes and simple transistors work

Review the four required sources listed under Background Information above. Google the relevant topics if you need additional explanations. Based on these articles (and any additional material that you read from the Background Materials or other sources), write a paper explaining: 1. How electrons move in conductors,

### Physics: Energy Problems

** Please see the attached file for the complete problem description ** Please provide me step by step solution. Problem 6: A mass (M=3kg) is placed in front of a spring with k=1200N/m, compressed d=40cm. The spring is released, shooting the mass forward from A to B (frictionless). The mass then travels along a flat surface

### Kinematics: Speed and Distance

1. An object of mass 1 kg traveling at 5.0 m/s enters a region of ice where the coefficient of kinetic friction is 0.10. Find the distance the object travels before coming to rest. 2. A glider is on a frictionless airtrack that is inclined at 8° with the horizontal. The glider is released from a point 100 cm from a bumper at

### Speed of the block when it is from its equilibrium position

A 10 Kg block on a horizontal frictionless surface is attached to a light spring (force constant = 80 kN/m). The block is initially at rest at its equillibrium position when a force (magnitude P=80N) acting paralel to the surface is applied to the block (stretching the spring). What is the speed of the block when it is 13 cm f

### Decay of a Top Quark to a W Boson and a B Quark

A top quark with mass Mtop = 170 GeV/c2 decays to a W boson (MW = 80 GeV/c2) and a b quark with mass (Mb = 5 GeV ). (a) Find the momentum and energy of each of the daughter particles if a top quark decays at rest. (b)What is the highest momentum W boson that can arise from the decay of a top quark that has energy Etop = 250

### Questions about the Bose Electromagnetic machine

(2.1) The Bose electromagnetic fatigue testing machine in room 114 Upson-I applies load and displacements to a test specimen via the application of a variable magnetic field to permanent magnets aligned along the top load shaft. A simplified model of the internal structure is shown in the attachment. The specimen is held by the

### Moments of Inertia: Example Problem

Would you help me with the following problem? Two metal disks, one with radius R1 = 2.44 and mass M1= 0.840 and the other with radius R2= 4.92 and mass M2= 1.70 , are welded together and mounted on a frictionless axis through their common center. . picture attached A) What is the total moment of inertia of the two di

### Calculate the molar fraction of GaP required to produce the 1.78 eV band gap

As a practical matter, GaAs and GaP are soluble in all proportions, and the band gap of the alloy increases nearly linearly with the molar additions of GaP. The band gap of pure GaP is 2.25 eV. Calculate the molar fraction of GaP required to produce the 1.78 eV band gap.

### Investigation of Elastic collisions of frictionless gliders

A 0.143 kg glider is moving to the right on a frictionless, horizontal air track with a speed of 0.840 m/s. It has a head-on collision with a 0.303 kg glider that is moving to the left with a speed of 2.25 m/s . Suppose the collision is elastic. Alright, I used the conservation of kinetic energy on this one and I have two var

### coefficient of kinetic friction between the block and the ta

A block with mass 0.50 kg is forced against a horizontal spring of negligible mass, compressing the spring a distance of 0.20 m. When released, the block moves on a horizontal tabletop for 1.00 m before coming to rest. The spring constant k is 100 N/m. What is the coefficient of kinetic friction between the block and the tabl

### Conservation of energy to find height thrown of a ball up

A ball is thrown vertically upwards into the air with a speed of 8.5 m.s-1. Assuming that all of the ball's initial kinetic energy is converted into gravitational potential energy, find the amount by which the height of the ball increases (before it starts to fall again).You should assume g = 9.8 m.s-2 and give your answer to an

### Underlying Concepts of Relativity

Using the relativistic expression for total energy E and the magnitude p of the momentum of a particle a) Show that the two quantities are related by E^2=(p^2)(c^2)+[m(c^2)]^2 b) Use this expression to determine the linear momentum of a proton with a kinetic energy of 1000MeV.

### Rotational energy of axles and wheels of Army four wheel truck

An Army four-wheel truck has a total mass of 8 metric tons. The truck is accelerated from rest up a sine 1-in-25 slope to a speed of 21.6 km/h. The engine produces an average tractive force F = 18 kN and the resistance to motion is 800 N. Each of its axles, including the wheels, may be assumed to have an effective mass of 900

### Multiparticle Schrodinger Equation

Please help with the following problem. Two identical spin-1/2 particles with mass m are in a one-dimensional infinite square-well potential with width a, so V(x)=0 for 0 <= x <= a, and there are infinite potential barriers at x=0 and x=a. The particles do not interact with each other; they see only the infinite square-well

### Determining Speed: Spacecraft Example

An object is projected vertically upwards from the North pole with initial speed Vo. The radius of the Earth is RE. Neglecting air resistance, find the speed at a distance s above the Earth's surface. (Assumes the solution is given in equation form) Additional question - Why are spacecraft usually launched from locations n

### Time dependent perturbation theory problem

A system is in an eigenstate | psi_i > with energy E_i. The perturbation V(t) = H'exp(-((alpha)^2)(t^2)) is turned on at t_i = -infinity and left on until t_f = infinity. Here H' is independent of time, and alpha is a constant. Show that at t_f = infinity, the probability that the system has evolved into the eigenstate |

### Calculate shift produced in the ground-state energy of hydrogen due to the finite size of the proton

In the hydrogen atom, the proton is not really a point charge but has a finite size. Assume that the proton behaves as a uniformly-charged sphere of radius R=10^(-15) m. Calculate the shift this produces in the ground-state energy of hydrogen.

### Inner product of two spin operators

Suppose that particle 1 (with spin 1) and particle 2 (with spin 1/2) interact via the Hamiltonian operator H = lambda S1 dot S2 , where lambda is a constant. Calculate the energy of the state |s,ms> .

### Simple Harmonic Motion & Elasticity, Reference Circle and Energy

**Please consider significant figures and draw visual graphics** Conceptual Questions: In the figure below, the shadow moves in simple harmonic motion. Where on the shadow's path is (a) the velocity (v) equal to zero and (b) the acceleration (a) equal to zero? **Please note that the velocity (v) and acceleration (a) have th

### Physics of Using Dumbbells

A student sits on a freely rotational stool holding two dumbbells, each of mass 3.00 kg. When the students arms are extended horizontally as in figure, the dumbbells are 1.00 m from the axis of rotation and the student rotates with an angular speed of 0.750 rad/s. The moment of inertia of the student plus stool is 3.00 kg and is

### Distance the block slide up inclined ramp before it comes to rest

Please show your work as I need to understand the solution well. A block of mass 2.0 kg resting on a horizontal frictionless surface is initially held against a spring of constant 5200 N/m that is compressed by 13 cm from its normal length. After the block is released, it slides along the frictionless surface until it encount

### Calculating Atomic Number and Total Energy of Atom

Part 1 An ionized atom has only a single electron. The n = 5 Bohr orbit of this electron has a radius of 8.298E-11 m. Calculate the atomic number Z of this atom. Part 2 Calculate the total energy E of its n = 3 Bohr orbit.

### Wavelength of Induced Emission

1. Electrons accelerated by a potential difference of 12.98 V pass through a gas of hydrogen atoms at room temperature. Calculate the wavelength of light emitted with the longest possible wavelength. 2. Calculate the wavelength of light emitted with the shortest possible wavelength.