S
  1. study help
  2. subject categories
  3. sciences
  4. physics
  5. september 2022
  6. 28

Physics Questions and Answers September 28, 2022

Expert-verified solutions to help you succeed

Solid Argon is held together by which of the following bonding mechanism A. Ionic bond only B. Covalent bond only C. Partly covalent and partly ionic bond D. Metallic bond E. Van der Waals bond.

What causes static electricity? How can you protect against static shocks? 30 marks.

What are Bernoullis principles, and how do they apply to flight? Explain in detailed.

What are the properties of radio waves, microwaves, and infrared waves? Give detailed answer.

Explain how do electromagnets differ from permanent magnets? Give detailed answer.

What are some differences between sound waves in air versus water? Do they move at different speeds through different mediums? 30 marks

Discuss the following qeustions. a. Explain Why is water wet?b. Water is essential for life, but what makes it so unique? c. Why does it freeze and boil at temperatures different from other liquids?

Whats the deal with magnets? Magnetism is one of the four fundamental forces in physics, but its a mystery how it works. Discuss in detailed.

Explain if metals conduct electricity better than other materials? Most students learn early on that some materials work electricity better than others. Give detailed answer giving examples.

How has climate change affected biodiversity in some of the worlds mountain ranges? Which animals/plants have been most affected by changing temperatures and precipitation levels? Are there any that have benefited from these changes? What can be done to help preserve biodiversity for future generations?

What are some ways that humans have changed the earths surface throughout history? How do these changes affect other species living there today? For example, what happens when we remove trees or build new roads. Give detailed answer.

How is an electric field similar to a gravitational field? If you put a charged object in an electric field, what will happen to it? In which direction will it move?

On an average day, estimate how much sustained voltage would you have to experience to feel a shock. What are some good safety measures when working around power tools and electrical appliances?

What is a transverse wave? For a transverse wave, define wavelength, amplitude, period, frequency, and wave speed. What are the units of each? Explain how these characteristics are related.

Explain why a pinhole camera works. Where is the "lens"? Where is the image located? What is its orientation?

What are the three primary colors for light addition? b. What colors appear when lights of any two primary colors are shone on a white object? c. How would you guess a TV set makes purple? Explain each in detailed.

Write a short paragraph on why objects look a certain color and why colored glass transmits a certain color of light. (For example, why is a blue quilt blue and why does red light pass through a red piece of glass?)

Write a short paragraph on polarization. Explain what it is and how we use polarizers. Explain why sunglasses polarize light vertically.

Write a short paragraph on early measurements of the speed of light.

Write a short paragraph on beats and how they are produced. Give examples.

Consider the differential equation dr dx dt3 dt2 dx 10 20 15x f(x), dt where f(x) is the input and a function of the output x. If f(x) 3e5, linearize the differential equation for x near x 0. Clearly show all work logically and explain all steps to linearize a nonlinear system.

A rectangular coil with N turns and area A is place in a uniform magnetic field directed into y-direction. (a) What amount of emf is induced in the coil if the coil doesnt move or rotate? . Lets say the coil rotates about the z-axis through its center at a constant angular velocity LaTeX: omega?. (b) What would be total magnetic flux through the

An attractive, onedimensional square well has depth V, as shown above. Which of the following best shows a possible wave function for a bound state (A) (1) (D) (1)

Consider a system of N noninteracting particles confined in a volume V at a temperature such that the particles obey classical Boltzmann statistics. If the temperature is lowered to the point at which quantum effects become important, the pressure of the gas may differ depending on whether the particles are fermions or bosons. Let PF be the

Consider a system of N noninteracting particles confined in a volume V at a temperature such that the particles obey classical Boltzmann statistics. If the temperature is lowered to the point at which quantum effects become important, the pressure of the gas may differ depending on whether the particles are fermions or bosons. Let PF be the

The hypothesis that an electron possesses spin is qualitatively significant for the explanation of all the following topics EXCEPT the A. Structure of the periodic table B. Specific heat of metals C. Anomalous Zeeman effect D. Deflection of moving electron by a uniform magnetic field E. Fine structure of atomic spectra

The circuit shown above is used to measure the size of the capacitance C. The ycoordinate of the spot on the oscilloscope screen is proportional to the potential difference across R, and the xcoordinate of the spot is swept at a constant speed s. The switch is closed and then opened. One can then calculate C from the shape and the size of the

Two capacitors of capacitance 1.0 microfarad and 2.0 microfarad are each charged by being connected across a 5.0Volt battery. They are disconnected from the battery and then connected to each other with resistive wires so that plates of opposite charge are connected together. What will be the magnitude of the final voltage across the 2.0

The circuits below consist of twoelement combinations of capacitors, diodes and resistors. Vin represents an acvoltage with variable frequency. It is desired to build a circuit for which Vout Vin at high frequencies and Vout o at low frequencies. Which of the following circuits will perform this task (A) (B) O (D) (E) Vin Vin Vin Vin Vin rou out

A balloon is to be filled with helium and used to suspend a mass of 300 kilograms in air. If the mass of the balloon is neglected, which of the following gives the approximate volume of helium required (The density of air is 1.29 kilograms per cubic meter and the density of helium is 0.18 kilogram per cubic meter.) A. 50 m B. 95 m3 C. 135 m D. 270

The conventional unit cell of a bodycentered cubic Bravais lattice is shown in the figure. The conventional cell has volume a. What is the volume of the primitive unit cell A. a8 B. a4 C. a2 D. q E. 293

When a narrow beam of monoenergetic electrons impinges on the surface of a single metal crystal at an angle of 30 degrees with the plane of the surface, firstorder reflection is observed. If the spacing of the reflecting crystal planes is know from xrays measurements to be 3 Angstrom, the speed of the electron is most nearly 10 x 104 ms A. 1.4 x

The longest wavelength Xray that can undergo Bragg diffraction in a crystal for a given family of planes of spacing d is A. d4 B. d2 C. d D. 2d E. 4d

An electromagnetic plane wave, propagating in vacuum, has an electric field given by E E cos (kxwt) and is normally incident on a perfect conductor at x 0, as shown in figure. Immediately to the left of the conductor, the total electric field E and the total magnetic field B are given by which of the following E 0 2E cos wt Incident Wave O 2E

A planepolarized electromagnetic wave is incident normally on a flat, perfectly conducting surface. Upon reflection at the surface, which of the following is true A. Both the electric vector and magnetic vector are reversed. B. Neither the electric vector nor the magnetic vector is reversed. C. The electric vector is reversed the magnetic vector

A conducting cavity is driven as an electromagnetic resonator. If perfect conductivity is assumed, the transverse and normal field components must obey which of the following conditions at the inner cavity walls A. En 0, Bn 0 B. En 0, Bt 0 C. Et 0, B 0 D. Et 0, B o E. None of the above

A coaxial cable has the cross section shown in the figure above. The shaded region is insulated. The regions in which r

Is it true that The acceleration of projectile is 0 m/s/s at the peak of the trajectory. Identify the evidence which supports your answer.

Which mass wasting process has the fastest rate of movement? a. slump b. debris avalanche c. earth flow d. solifluction e. mud flow

A 18 kg cannon ball is fired from a cannon with muzzle speed of 1192 ms at an angle of 52.8 with the horizontal. The acceleration of gravity is 9.8 ms. Use conservation of mechanical energy to find the maximum height reached by first ball. Answer in units of m.

The figure above show the photon interaction cross sections for lead in the energy range where the Compton, photoelectric, and pair production processes all play a role. What is the correct identification of these cross sections A. 1 Photoelectric, 2 Compton, 3 Pair production B. 1 Photoelectric, 2 Pair production, 3 Compton C. 1 Compton, 2

Photons of wavelength scatter elastically on free protons initially at rest. The wavelength of the photons scattered at 90 is increased by .1137 B. 1836 C. (mc) where Plancks constant, me the rest mass of an electron, and c the speed of light D. (mpc) where Plancks constant, mp the rest mass of a proton, and c the speed of light E. zero

An astronomer observes a very small moon orbiting a planet and measures the moons minimum and maximum distances from the planets center and the moons maximum orbital speed. Which of the following CANNOT be calculated from these measurements A. Mass of the moon B. Mass of the planet C. Minimum speed of the moon D. Period of the orbit E. Semimajor

A satellite of mass m orbits a planet of mass M in a circular orbit of radius R. The time required for one revolution is A. independent of M B. proportional to Vm C. linear in R D. proportional to R32 E. proportional to R

The coefficient of static friction between a small coin and the surface of a turntable is 0.30. The turntable rotates at 333 revolutions per minute. What is the maximum distance from the center of the turntable at which the coin will not slide A. 0.024 m B. 0.048 m C. 0.121 m D. 0.242 m E. 0.484 m

A particle of mass M moves in a circular orbit of radius r around a fixed point under the influence of an attractive force F 3, where K is a constant. If the potential energy of the particle is zero at an infinite distance from the force center, the total energy of the particle in the circular orbit is A. K2 B.K272 C. O D. 27 E. K2

When it is about the same distance from the Sun as is Jupiter, a spacecraft on a mission to the outer planets has a speed that is 1.5 times the speed of Jupiter in its orbit. Which of the following describes the orbit of the spacecraft about the Sun A. Spiral B. Circle C. Ellipse D. Parabola E. Hyperbola

Show that the magnetic field at the center of the circular loop is B Hol at fixed distance x far away from the loop is 2R HOIR 223 and

A dielectric of dielectric constant K is placed in contact with a conductor having surface charge density o, as shown above. What is the polarization (bound) charge density op on the surface of the dielectric at the interface between the two materials Interface

Which of the following statements concerning the electrical conductivities at a room temperature of a pure copper sample and a pure silicon sample is NOT true A. The conductivity of the copper sample is many orders of magnitude greater than that of silicon sample. B. If the temperature of the copper sample is increased, its conductivity will

Consider the concentration, C, in mgliter, of a drug in the blood as a function of x, of the amount, in mg, of the drug given and t, the time in hours since the injection. For 0 x 4 mg and t 0 hours, we have C f(x, t) tet(5x). Find f(1, 2). (Round your answer to three decimal places.) mgliter Interpret in terms of drug concentration. The

Lattice forces affect the motion of electrons in a metallic crystal, so that the relationship between the energy E and wave number k is not the classical equation E k2m, where m is the electron mass. Instead, it is possible to use an effective mass m given by which of the following dk A. m 1 (1) dE k B. m () C. mhm ( dE2 D. m. dk 13 dk Em Am

The mean kinetic energy of the conduction electrons in metals is ordinarily much higher than KT because A. electrons have many more degrees of freedom than atoms do B. the electrons and the lattice are not in thermal equilibrium C. the electrons form a degenerate Fermi gas D. electrons in metals are highly relativistic E. electron interact

A woman stands at a horizontal distance x from a mountain and measures the angle of elevation of the mountaintop above the horizontal as 0. After walking a distance d closer to the mountain on level ground, she finds the angle to be . Find a general equation for the height y of the mountain in terms of d, 4, and 0, neglecting the height of her

A woman wishing to know the height of a mountain GP measures the angle of elevation of the mountaintop as 12.0. After walking 1.00 km closer to the mountain on level ground, she finds the angle to be 14.0. (a) Draw a picture of the problem, neglecting the height of the womans eyes above the ground. Hint Use two tri angles. (b) Using the symbol y

Air is blown into a spherical balloon so that, when its radius is 6.50 cm, its radius is increasing at the rate 0.900 cms. (a) Find the rate at which the volume of the balloon is increasing. (b) If this volume flow rate of air entering the balloon is constant, at what rate will the radius be increasing when the radius is 13.0 cm (c) Explain

A helium atom, mass 4u travels with non relativistic speed v normal to the surface of a certain material, makes an elastic collision with an (essentially free) surface atom, and leaves in the opposite direction with speed 0.6v. The atom on the surface must be an atom of A. Hydrogen, mass 1u B. Helium, mass qu C. Carbon, mass 12u D. Oxygen, mass

As shown in the picture, a ball of mass m, suspended on the end of a wire, is released from height h and collides elastically, when it is at its lowest point, with a block of mass 2m at rest on a frictionless surface. After the collision, the ball rises to a final height equal to A. 19 h B. 18 h C. 13 h D. 12 h E. 23 h

Bacteria and other prokaryotes are found deep under ground, in water, and in the air. One micron (106 m) is a typical length scale associated with these microbes. (a) Estimate the total number of bacteria and other prokaryotes on the Earth. (b) Estimate the total mass of all such microbes.

A spherical shell has an outside radius of 2.60 cm and an inside radius of a. The shell wall has uniform thick ness and is made of a material with density 4.70 gcm. The space inside the shell is filled with a liquid having a density of 1.23 gcm. (a) Find the mass m of the sphere, including its contents, as a function of a. (b) For what value of

Using phasors, calculate the current i(t) Given v(t) 120 sin(377t 60) V C 50F, L 40mH, R 200. i(t) cos ( ) A. Note I put the answer in cos (instead of sin) to throw a small wrench in the problem. So remember, to adjust your angle for it. t

As shown in the above diagram, person A driving a car with speed v17 ms hears a siren sound with frequency f737 Hz at a distance of d 141 m behind him, coming from an ambulance chasing his car with speed vam 34 ms. What is the approximate frequency of the siren sound heard in the ambulance

A lump of clay whose rest mass is 4 kilograms is travelling at threefifths the speed of light when it collides headon with an identical lump going the opposite direction at the same speed. If the two lumps stick together and no energy is radiated away, what is the mass of the composite lump A. 4 kg B. 6.4 kg C. 8 kg D. 10 kg E. 13.3 kg

Suppose that the gravitational force law between two massive objects were (2E) F2 r12 Gmmr12 12 where is a small positive number. Which of the following statements would be FALSE A. The total mechanical energy of the planetSun system would be conserved. B. The angular momentum of a single planet moving about the Sun would be conserved. C. The

The cylinder shown above, with mass M and radius R, has a radially dependent density. The cylinder starts from from rest and rolls without slipping down an inclined plane of height H. At the bottom of the plane its translational speed is (8gH7)12. Which of the following is the rotational inertia of the cylinder E. 4MR H

The muon decays with a characteristic lifetime of about 106 second into an electron, a muon neutrino, and an electron antineutrino. The muon is forbidden from decaying into an electron and just a single neutrino by the law of conservation of A. charge B. mass C. energy and momentum D. baryon number E. lepton number

A particle of mass m is moving along the xaxis with speed u when it collides with a particle of mass 2m initially at rest. After the collision, the first particle has come to rest, and the second particle has split into two equalmass pieces that move at equal angles o with the xaxis, as shown in the figure. Which of the following statements

A uniform stick of length L and mass M lies on a frictionless horizontal surface. A point particle of mass m approaches the stick with speed v on a straight line perpendicular to the stick that intersects the stick at one end, as shown above. After the collision, which is elastic, the particle is at rest. The speed V of the center of mass of the

A ball is dropped from a height h. As it bounces off the floor, its speed is 80 of what it was just before it hit the floor. The ball will then rise to a height of most nearly A. 0.94 h B. 0.80 h C. 0.75 h D. 0.64 h E. 0.50 h

A man of mass m on an initially stationary boat gets off the boat by leaping to the left in an exactly horizontal direction. Immediately after the leap, the boat of mass M is observed to be moving to the right at speed v. How much work did the man do during the leap (both on his own body and on the boat) A. 2 Mv2 B. 12 mv2 C. 12 (M m)v D. 12 (M

One feature common to both the Debye theory and the Einstein theory of the specific heat of a crystal composed of Nidentical atoms is that the A. Average energy of each atom is 3kT B. Vibrational energy of the crystal is equivalent to the energy of 3N independent harmonic oscillators C. Crystal is assumed to be continuous for all elastic waves D.

The exponent in Coulombs inverse square law has been found to differ from two by less than one part in a billion by measuring which of the following A. The charge on an oil drop in the Millikan experiment B. The deflection of an electron beam in an electric field C. The neutrality of charge of an atom D. The electric force between two charged

Two pith balls of equal mass M and equal charge q are suspended from the same point on long massless threads of length L as shown in the figure above. If k is the Coulombs law constant, then for small values of 0, the distance d between the charged pith balls at equilibrium is A. (2kqLMg)3 B. (kqLMg)3 C. (2kqLMg)2 D. (kqLMg)2 E. L4

Two identical conducting spheres, A and B, carry equal charge. They are initially separated by a distance much larger than their diameters, and the force between them is F. A third identical conducting sphere, C, is uncharged. Sphere C is first touched to A, then to B, and then removed. As a result, the force between A and B is equal to. A. o B.

In experiments located deep underground the two types of cosmic rays that most commonly reach the experimental apparatus are A. alpha particles and neutrons B. protons and electrons C. iron nuclei and carbon nuclei D. muons and neutrinos E. positrons and electrons

A particle of mass m that moves along the xaxis has potential energy V(x) a bx, where a and b are positive constants. Its initial velocity is vo at x o. It will execute simple harmonic motion with a frequency determined by the value of A. B. b and a alone b alone C. b and m alone D. b, a and m alone E. b, a, m and vo

The potential energy of a body constrained to move on a straight line is k where k is a constant. The position of the body is x, its speed u, its linear momentum p, and its mass m. The force on the body is A. 2mv B. 4kx C. kx4 D. kxx 55 E. mg

A free particle with initial kinetic energy E and de Broglie wavelength enters a region in which it has potential energy V. What is the particles new de Broglie wavelength A. X(1 EV) B. (1 VE) C. (1EV) D. X(1 VE) 2 E. (1 VE)2

A particle leaving a cyclotron has a total relativistic energy of 10 GeV and a relativistic momentum of 8 GeVc. What is the rest mass of this particle A. 0.25 GeVc B. 1.20 GeVc C. 2.00 GeVc D. 6.00 GeVc E. 16.0 GeVc

In the circuit shown above, the resistances are given in ohms and the battery is assumed ideal with emf equal to 3.0 volts The resistor that dissipated the most power is R3002 R250 6002 R.3302 R3002

A positively charged particle is moving in the xyplane in a region where there is a nonzero uniform electric magnetic field B in the z direction and a nonzero uniform electric field in the ydirection. Which of the following is a posible trajectory for the particle (A) (B) mor (D)

A charged particle, A, moving at a speed much less than c, decelerates uniformly. A second particle, B, has onehalf the mass, twice the charge, three times the velocity, and four times the acceleration of particle A. According to classical electrodynamics, the ratio PBPA of the powers radiated is A. 16 B. 32 C. 48 D. 64 E. 72

A sphere of radius R carries charge density proportional to the square of the distance from the center p Ar2, where A is a positive constant. At a distance of R2 from the center, the magnitude of the electric field is A. A4TEO B. AR40 C. AR2450 D. AR50 E. AR350

The line integral of u yi xj zk around a circle of radius R in the xy plane with center at the origin is equal to A. o B. 27R C. 27R D. R4 E. 3R

Two thousand kg of water, initially a saturated liquid at 150C, is heated in a closed, rigid tank to a final state where the pressure is 2.5 MPa. Determine the final temperature, in C. the volume of the tank, in m, and sketch the process on ST and pv diagrams.

A solid cylinder r 17.5 cm, h 16.5 cm has a mass of 13.49 kg. This cylinder is floating in water. Then oil is poured on top of the water until the situation. How much of the height of the cylinder is in the oil

Consider two thin identical conducting wires covered with very thin insulating material. One of the wires is bent into a loop and produces magnetic field B1, at its centre when a current I passes through it. The second wire is bent into a coil with three identical loops adjacent to each other and produces magnetic field B2 at the centre of the

A paramagnetic material has 1028 atoms/m3. Its magnetic susceptibility at temperature 350 K is 2.8 104. Its susceptibility at 300 K is (a) 3.267 104 (b) 3.672 104 (c) 2.672 104 (d) 3.726 104

A weighted pendulum swings back and forth freely and its horizontal position is plotted against time. The resulting plot appears as a cosine wave B 0 0.20 metres x C B Figure 1 Horizontal position of a pendulum plotted against time. The pendulum swings from A to C through position B, then returns to A through B again. The pendulum completes two

One end of a horizontal uniform beam of weight W and length L is hinged on a vertical wall at point O and its other end is supported by a light inextensible rope. The other end of the rope is fixed at point Q, at a height L above the hinge at point O. A block of weight aW is attached at the point P of the beam, as shown in the figure (not to

A source, approaching with speed u towards the open end of a stationary pipe of length L, is emitting a sound of frequency f. The farther end of the pipe is closed. The speed of sound in air is v and fo is the fundamental frequency of the pipe. For which of the following combination(s) of u and fs, will the sound reaching the pipe lead to a

For a prism of prism angle 0 60, the refractive indices of the left half and the right half are, respectively, n and n (n n) as shown in the figure. The angle of incidence i is chosen such that the incident light rays will have minimum deviation if n n n 1.5. For the case of unequal refractive indices, n n and n n An (where An

A physical quantity S is defined as S (Ex B), where E is electric field, B is magnetic field and o is the permeability of free space. The dimensions of S are the same as the dimensions of which of the following quantity(ies) (A) (C) Energy Charge x Current Energy Volume (B) (D) Force Lenght Time Power Area

A heavy nucleus N, at rest, undergoes fission N PQ, where P and Q are two lighter nuclei. Let 8 MN Mp Mo, where Mp, Mo and My are the masses of P, Q and N, respectively. Ep and EQ are the kinetic energies of P and Q, respectively. The speeds of P and Q are Vp and vo, respectively. If c is the speed of light, which of the following statement(s)

Two concentric circular loops, one of radius R and the other of radius 2R, lie in the xyplane with the origin as their common centre, as shown in the figure. The smaller loop carries current I, in the anticlockwise direction and the larger loop carries current I in the clock wise direction, with 121. B(x, y) denotes the magnetic field at a point

A Soft plastic bottle, filled with water of density 1 gmcc, carries an inverted glass testtube with some air (ideal gas) trapped as shown in the figure. The testtube has a mass of 5 gm, and it is made of a thick glass of density 2.5 gmcc. Initially the bottle is sealed at atmospheric pressure po 105 Pa so that the volume of the trapped air is vo

A pendulum consists of a bob of mass m 0.1 kg and a massless inextensible string of length L 1.0 m. It is suspended from a fixed point at height H 0.9 m above a frictionless horizontal floor. Initially, the bob of the pendulum is lying on the floor at rest vertically below the point of suspension. A horizontal impulse P 0.2 kgms is imparted to

In the circuit, a metal filament lamp is connected in series with a capacitor of capacitance C F across a 200 V, 50 Hz supply. The power consumed by the lamp is 500 W while the voltage drop across it is 100 V. Assume that there is no inductive load in the circuit. Take rms values of the voltages. The magnitude of the phaseangle (in degrees)

A special metal S conducts electricity without any resistance. A closed wire loop, made of S, does not allow any change in flux through itself by inducing a suitable current to generate a compensating flux. The induced current in the loop cannot decay due to its zero resistance. This current gives rise to a magnetic moment which in turn repels the

A thermally insulating cylinder has a thermally insulating and frictionless movable partition in the middle, as shown in the figure below. On each side of the partition, there is one mole of an ideal gas, with specific heat at constant volume, Cy2R. Here, R is the gas constant. Initially, each side has a volume Vo and temperature To. The left side