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Hw Questions
The US uses about 8 x 1019 J of energy per year. How much mass would that require if we could totally convert mass to energy? If the mass came from, say, turning used cars entirely into energy, estimate how many would be required?
Astronaut Flo wishes to travel to a star 20 light years away
Light requires 4.5 years to travel from the nearest star to earth
You drive past a potential parking space in center city. Your new car
Mr. Electron is about to head home after a hard day at work. His usual route is 10 mm long, but he can also take a short-cut that is only 9.5 mm long. (He's an electron! The distances are short!) If he strolls along at his usual 0.725 m/s, why can M
If the wavelength of a photon and the wavelength of an an electron are both 250 nm, calculate the ratio of the photon energy to the electron energy. Which has the greater energy?
10,000 electrons go through a double slit to form an interference pattern. At one location we measure 144 electrons. What is the magnitude of the wavefunction at that location?
To use an electron microscope to view Corona Virus particles of 50 nm diameter, what can you say about the wavelength of the electrons? What must their speed be?
Does the notion of matter waves mean that you can be in two places at once?
Two sources of electromagnetic radiation are in phase
A Michelson interferometer is illuminated with 500 nm light. One of the mirrors is moved so that 1000 fringes move past the crosshairs of the observing telescope. How much has the mirror moved?
A Michelson interferometer is illuminated with 500 nm light. One of the mirrors is moved so that 1000 fringes move past the crosshairs of the observing telescope. How much has the mirror moved?
Suppose you wanted to use a non-reflecting layer
A glass camera lens with an index of refraction of 1.55 is to be coated with a cryolite film (n = 1.3) to decrease the reflections of normally incident green light of wavelength 500 nm. How thick should such a film be?
FM radio goes from 88 to 108 Mz. AM goes from 535 to 1605 kHz. What wavelengths do these imply?
An ignition coil to start a car can produce as much as 25 kV. How does it get this voltage from 12 volts?
A certain transformer has 500 turns on the primary.
Will dropping a bar magnet down a long copper tube produce a current in the tube? Explain.
A student, observing that a pendulum will oscillate by itself
A 747 with a wingspan of 60 m is flying across an area of the earth where the earth's magnetic field is 5 x 10 -4 T. If the aircraft is travelling at 200 m/s perpendicular to the field, how much potential difference is induced between the wingtips.
ABC Telecom is considering a three-year project that has a weighted average cost of capital of 12% and a NPV of $49,876. ABC Telecom can replicate this project indefinitely. What is the equivalent annual annuity (EAA) for this project?
True or False: The change in the real exchange rate that resulted from the decline in the quality of U.S. products may increase our standard of living.
Which of the following statements are true based on these graphs? Check all that apply.
Migratory birds are able to use the earth's
Estimate the magnetic field 1 m away from a lightning strike
Suppose that someone argues that when a bar of iron is magnetized, all the north poles go to one end and all the south poles go to the other end. How could you disprove the suggestion?
An electron is chasing a proton up the page. What happens to their paths if a magnetic field is suddenly turned on perpendicular to the surface of the page.
Explain the following
Kuhn does not have any retained earnings available to finance this project, so the firm will have to issue new common stock to help fund it. Its common stock is currently selling for $22.35 per share, and it is expected to pay a dividend of $2.78 at the e
Turnbull Co. is considering a project that requires an initial investment of $1,708,000. The firm will raise the $1,708,000 in capital by issuing $750,000 of debt at a before-tax cost of 10.2%, $78,000 of preferred stock at a cost of 11.4%, and $880,000 o
If its current tax rate is 40%, how much higher will Turnbull’s weighted average cost of capital (WACC) be if it has to raise additional common equity capital by issuing new common stock instead of raising the funds through retained earnings? (Note: Round
Bryant Co. has $1.1 million of debt, $3 million of preferred stock, and $2.1 million of common equity. What would be its weight on debt?
A student builds the following circuit in a lab experiment, which she records and takes home to analyze.
How do you know that homes are not wired in series?
Suppose you fall from a building and on the way down you grab a high voltage wire. Assuming that the wire holds you, will you be electrocuted? If the wire breaks, should you continue to hold on as you fall?
The following questions refer to the figure below. At the start, the switch between points c and c is open as a drawn
Which has a greater resistance: 75 watt bulb or a 100 watt bulb?
Imagine a copper wire 10 km long
A cloud can discharge as much as 20 coulombs in a lightning bolt. If the bolt lasts only 0.1 msec, how many amps is that?
The figure at the bottom of the page shows a plot of a potential map made by a student, but the distance scale is unknown. Lines are drawn at 1 volt intervals.
If, on a cold morning you find your
The gap in a spark plug is 0.025 inches. How great a voltage is required to make it spark?
Sparks occur when the electric field in air exceeds
Consider a cube. On 5 Sides
40 Coulombs of charge are separated by 6 km in a thundercloud. How large is the electric field half way between the charges? This gives an idea of large electric fields you might experience
We want to get better, more concrete
The size of the nucleus is about 10-14 m in diameter. If you wanted to add another proton to a Uranium nucleus (92 protons and 146 neutrons), how strong is the repulsive force at the "edge" of the nucleus?
Is it correct to say that a positive test charge, released from rest, will move along electric field lines if those lines are straight? What if the lines are curved? (Recall Newton's first law.)
A professor is trying to quickly estimate the focal length of a 2.5 cm diameter biconvex lens. He takes the lens and finds the image of the overhead ceiling lights on his table to be 3 cm below the lens, so he estimates the focal length as about 3 cm.
A common design for a spotlight uses a lens and a mirror, combined with a gas-discharge lamp, to project a powerful parallel beam of light. Where are the lens and mirror positioned?
A converging lens ( f = 12.0 cm) is located 30.0 cam to the left
When a diverging lens is held 13.0 cm above a line of print, as in Figure 26.29, the image is 5.0 cm beneath the lens. (a) Is the image real or virtual? (b) What is the focal length of the lens?
If you hold a typical pair of glasses over a table, with overhead lighting, the lenses produce a shadow on the surface. Why should clear lenses produce a shadow?
The drawing shows a crystalline quartz slab...
it is possible to construct a telescope using only mirrors
A spherical mirror is polished on both sides
The image behind a convex mirror
An object is placed in front of a convex mirror
1. If you stand 8 m in front of a plane mirror and focus a camera on yourself, for what distance is the camera now focused?
If you have ever inhaled helium
A 32 cm long violin string is pulled tight with a force
Two wave pulses are heading toward
While standing in the supermarket
A ligth string
An athlete
Bats use the Doppler effect to determine their location
Do you think that the volume
Under water, dolphins
A Stone is thrown into a pond
A student is observing the....
It is said that walking at a comfortable speed
Pendulum Clocks Are Very Important...
Which is more disordered: a 1000 word paper with 1 word misspelled, or a 2000 word paper with 2 mistakes? Compare the entropy of the two situations.
Suppose you had 10 identical molecules enclosed by a box. At a given instant, one molecule has an energy of 100 Joules, and the others are all stationary. (A) What is the average kinetic energy of the 10 molecules? (B) Is this a situation of high or low
The drawing refers to one mole of a monatomic ideal gas and shows a process that has four steps, two isobaric (A to B, C to D) and two isochoric (B to C, D to A). Complete the following table by calculating U, W, and Q (including the algebraic signs) for
The volume of a gas is changed along the curved line between A and B in the drawing. Do not assume that the curved line is an isotherm or that the gas is ideal. (a) Find the magnitude of the work for the process, and (b) determine whether the work is posi
When a .22-caliber rifle is fired, the expanding gas from the burning gunpowder creates a pressure behind the bullet. This pressure causes the force that pushes the bullet through the barrel. The barrel has a length of 0.61 m and an opening whose radius i
We want to determine how much the room temperature increases when a kg of ice freezes.
We want to determine how much the room temperature increases.....
How High a building could fire hoses effectively.........
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