what would the equilibrium temperature of the earth be if it were in mars's orbit? what about venus's orbit?

Show that RC has units of seconds if R is in ? and C is in F

PART A

Which of these affects the energy of an electron that is emitted by a surface exposed to light?SELECT ALL THAT APPLY.

PART B

When photons meet and reflect from a surface and are then detected after they reflect ...

Pick those that are true

PART C

Suppose we have two sources of light, a red one with wavelength 650 nm, and a blue one with wavelength 450 nm. Both produce the same optical power, delivering 1 milliwatt (10^-3 watts) of energy per second per square centimeter to a metal target with an area of 1 cm².

1. Which color would deliver more photons each second?

All the photoelectrons that are produced are collected by another electrode and we determine the current in amperes using a circuit and an "ammeter", that is, some device that can give a precise quantitative measure of the current. Such a device might use the magnetic field generated by the current, or the voltage produced when the current flows across a resistance.

2. If the work function of the surface is 2 eV, will we see a current with both colors, one color, or neither one? If so, how much (in amperes), or if not, explain.

3. If we now increased the power in the light sources by 1000 times, how would that change your answers to part 2?

We want to rotate the direction of polarization of a beam of polarized light through 90° by sending the beam through one or more polarizing sheets. (a) What is the minimum number of sheets required? (b) What is the minimum number of sheets required if the transmitted intensity is to be more than 81% of the original intensity?

QUESTION 1

1. What is the approximate radius of an oxygen nucleus with 8 protons and 8 neutrons?

   	1.	3.02 fm
   	2.	2.4 fm
   	3.	3.53 fm
   	4.	1.10 fm
   	5.	2.89 fm

1 points   

QUESTION 2

1. It is possible to tell α particles from β particles by placing the decaying atom

   in a magnetic field because

   	1.	α particles deflect in the magnetic field but β particles don't
   	2.	β particles deflect in the magnetic field but α particles don't
   	3.	α particles deflect in one direction and β particles in other.
   	4.	α and β particles both deflect in the samedirection but β particles deflect much more.
   	5.	α and β particles both deflect in the same direction but α particles deflect much more.

1 points   

QUESTION 3

1. In terms of the penetrating capabilities of the different types of radiation

   	1.	they all penetrate roughy the same amount of material
   	2.	γ rays can penetrate much deeper than α rays
   	3.	α rays can penetrate much deeper than γ rays
   	4.	β rays can penetrate much deeper than γ rays

1 points   

QUESTION 4

1. Particles which are acted on by the weak nuclear force but not the strong nuclear force are

   referred to as

   	1.	quarks
   	2.	hadrons
   	3.	mesons
   	4.	baryons
   	5.	leptons

1 points   

QUESTION 5

1. When a kilogram of a material has absorbed 0.01 Joules of energy from radiation, we say

   it has received

   	1.	1 rad
   	2.	1 roentgen
   	3.	1 RBE
   	4.	1 curie

1 points   

QUESTION 6

1. Which of the following particles will have a larger biological effect on a human assuming they all

   have the same energy?

   	1.	an X-ray
   	2.	a γ ray
   	3.	a slow neutron
   	4.	an α particle

1 points   

QUESTION 7

1. The purpose of the control rods in a nuclear reactor is to

   	1.	slow down the neutrons given off during fission
   	2.	speed up the neutrons given off during fission
   	3.	absorb the neutrons given off during fission
   	4.	absorb the protons given off during fission
   	5.	absorb the γ rays given off during fission

1 points   

QUESTION 8

1. The purpose of a moderator in a nuclear reactor is to

   	1.	slow down the neutrons given off during fission
   	2.	speed up the neutrons given off during fission
   	3.	absorb the neutrons given off during fission
   	4.	absorb the protons given off during fission
   	5.	absorb the γ rays given off during fission

1 points   

QUESTION 9

1. Which of the four fundamental forces has the largest interaction strength?

   	1.	gravitational force
   	2.	weak nuclear force
   	3.	strong nuclear force
   	4.	electro-magnetic force

1 points   

QUESTION 10

1. It is possible to imagine the human body by looking at the radiation produced from

   the annihilation of matter and antimatter. This is referred to as

   	1.	magnetic resonance imaging (MRI)
   	2.	X-rays
   	3.	computer aided tomography (CAT)
   	4.	positron emission tomography (PET)

1 points   

Apparently there is a gravity anomaly in the Hudson Bay Area in Canada: gravity is "missing" or it is slightly less than it is in the rest of the world.

Does that mean that things in the Hudson Bay Area would theoretically be at a higher gravitational potential, and consequently clocks would run faster there? Would people living there have "more time" than people in other parts of the world - even if over their lives it only amounted to a few nanoseconds?

1. you are given a .5 m^3 container containing 9 moles of an ideal diatomic gas at 0° C, and you want to allow it to reach room temperature (20° C) while staying at the same pressure. You have a choice of holding the volume constant while heating it (process A) and then slowly decompressing the gas isothermally (process B) or simply heating it while maintaining pressure (process C).

a) What is the pressure of the gas?

b) What is the change in internal energy of the gas in going from the initial state to the final state?

c) Calculate the work done and heat transferred during process A. note whether these transfer energy into or out of the gas.

d) Calculate the work done and heat transferred during process B. note whether these transfer energy into or out of the gas.

e) Calculate the work done and heat transferred during process C. note whether these transfer energy into or out of the gas.

f) How do the total work and heat transfer compare for the two methods for getting from the initial state to the final state (AB and C)?

Elements that appear in the same column of the periodic table often share similar chemical properties. In the case of the alkaline earth metals, this is troublesome since the body treats calcium (necessary for proper bone growth) and radium (a radioatictive element) as chemically similar, storing both in bone marrow. The radium then bombards nearby bone cells with alpha particles, causing them to \"crumble.\" Radium poisoning investigations often center on the identification of radium and its isotopes in bone samples using a mass spectrometer. Pictured is a schematic of a simplified mass spectrometer, showing the paths of calcium, barium (another alkaline earth metal) and radium isotopes entering the chamber. The region shown is immersed in a constant magnetic field of 0.352 tesla pointing out of the plane of the schematic. Motion of the positively-charged isotopes toward the right was initiated by a charge separation of 2155 volts on the two plates shown. Using the data shown in the table below, calculate the path radius of the Ca ion. Note that 1 amu = 1.661

Note: We suggest you use ray diagrams to qualitatively understand these questions. A candle 6.10 cm high is placed in front of a thin converging lens of focal length 33.0 cm. What is the image distance i when the object is placed 93.0 cm in front of the same lens?

What is the size of the image? (Note: an inverted image will have a `negative' size.)

Is the image real(R) or virtual(V); upright(U) or inverted(I); larger(L) or smaller(S) or unchanged(UC); in front of the lens(F) or behind the lens(B)? Answer these questions in the order that they are posed. (for example, if the image is real, inverted, larger and behind the lens then enter `RILB'.)

The object is now moved to 41.0 cm in front of the lens, what is the new image distance i?

What is the new size of the image?

Is the new image real(R) or virtual(V); upright(U) or inverted(I); larger(L) or smaller(S) or unchanged(UC); in front of the lens(F) or behind the lens(B)? Answer these questions in the order that they are posed. (for example, if the image is real, inverted, larger and behind the lens then enter `RILB'.)

The object is now moved to 21.0 cm in front of the lens, what is the new image distance i?

What is the new size of the image?

Is the new image real(R) or virtual(V); upright(U) or inverted(I); larger(L) or smaller(S) or unchanged(UC); in front of the lens(F) or behind the lens(B)? Answer these questions in the order that they are posed. (for example, if the image is real, inverted, larger and behind the lens then enter 'RILB'.)

The object is now moved to 6.5 cm in front of the lens, what is the new image distance i?

What is the new size of the image?

Is the new image real(R) or virtual(V); upright(U) or inverted(I); larger(L) or smaller(S) or unchanged(UC); In front of the lens(F) or behind the lens(B)? Answer these questions in the order that they are posed. (for example, if the image is real, inverted, larger and behind the lens then enter 'RILB'.)

So this is kinda a tough question, I know, but can anyone explain electrostatics to me--the general concepts I should know for an AP-preparatory, very tough Physics 2 clas? I've really been slacking through this whole unit becuase my other classes are picking up, so if anyone could explain the basics of electromagnetism, electrostatics, and circuits would be really great--test is tommorrow. Yeesh.

A 59.3-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are 0.582 and 0.428, respectively. What horizontal pushing force is required to (a) just start the crate moving and (b) slide the crate across the dock at a constant speed?

A ball is dropped from rest from the top of a building of height h. At the same instant, a second ball is projected vertically upward from ground level, such that it has zero speed when it reaches the top of the building.

a) When do the two balls pass each other? Answer it in terms of h.

b)Which ball has greater speed when they are passing?

c)What is the height of the two balls when they are passing?

You are 9.0 m from the door of your bus, behind the bus, when it pulls away with an acceleration of 1.0 m/s2. You instantly start running toward the still-open door at 5.1 m/s.

A)How long does it take for you to reach the open door and jump in?

B) What is the maximum time you can wait before starting to run and still catch the bus?

A 2,000-kg spacecraft has an initial velocity of 8 km/s. A thruster is then fired which provides a thrust force of 10,000 N for 15 seconds. What is the velocity of the spacecraft after the thruster burn? (assume a straight path)

Calculate the angle of incidence of beam radiation on a surface located at Harrisonburg, VA at 10:30 A.M. (solar time) on February 13, if the surface is tilted 45° from the horizontal and pointed 15° west of south.