Physics Questions and Answers October 24, 2019

Consider a circular tube of length 0.5m with a speaker at one end and a rigid plate at the other end. The speaker produces a tone at 500Hz and the amplitude of the pressure measured by a microphone flush-mounted at the rigid end of the tube is 10^-3 Pa. Calculate the pressure amplitude half-way down the tube. You may assume that the sound field

Consider a cyclic equilibrium process made up of following sub processes

9. Problem 4.3 Consider a cyclic equilibrium process made of the following subprocesses ab is at constant pressure with increasing volume. be is at constant volume with decreasing pressure. ca is adiabatic. Assume the system is an ideal gas with constant cy and 7 1.5. (a) Sketch the process on a PV diagram. (b) Complete the following table with

Consider a finite square well, with V = 1.2 eV outside. It holds several energy states, but we are only interested in two:

Consider a finite square well, with V 1.2 eV outside. It holds several energy states, but we are only interested in two E, 1.15 ev E2 1.1 ev 1) For E 1.15 ev, what is the decay constant, K, outside the well (i.e., where V 1.2 eV) nm1 Submit 2) For E 1.1 eV, what is the decay constant, K, outside the well (i.e.,) where V 1.2 eV) 1 Submit

Consider a newly formed globular cluster, with a total mass 10^6 Solar Masses, and an initial mass function dN/dm = am^-2.35 in the mass range 0.1 - 20 Solar Masses, where m = M/1 Solar mass. Find the constant a Find the total luminosity of the cluster, assuming that all its stars are on the main sequence, and a mass-luinosity relation L~M^4. What

You have been hired as a technical consultant for an early-morning cartoon series for children to make sure that the science is correct. In the script, a wagon containing two boxes of gold (total mass of 150 kg) has been cut loose from the horses by an outlaw. The wagon starts from rest 50 meters up a hill with a 6o slope. The outlaw plans to have

You have been hired as a technical consultant for an early-morning cartoon series for children to make sure that the science is correct. In the script, a wagon containing two boxes of gold (total mass of 150 kg) has been cut loose from the horses by an outlaw. The wagon starts from rest 50 meters up a hill with a 6o slope. The outlaw plans to have

A broken leg is kept in traction in the medical device pictured below. The device is designed to use the ropes to provide a constant horizontal force of 30 N on the leg. What must the weight of block A be for this horizontal force? Ignore all friction and show all work

35 degrees 35 degrees Block A

In the picture below, the 21 kg mass is attached by a cord to a mass hanging over the edge of the table. The frictional force between the mass and the table's surface is 121 N. The mass accelerates at a rate of 0.73 m/s^2 to the right. What is the weight of the hanging block? Show all work

a 0.73 ms2 m 21 kg Ff 121 N

A train is pulling four train cars and each car has a mass of 40,000 kg. The train is accelerating at 1.1 m/s^2. What is the force produced by the train's engine car to provide this acceleration? (Ignore all friction) A. 211000 N B. 149000 N C. 201000 N D. 176,000 N

A 3000 kg truck is sliding down a hill that is at an angle of 40 degrees above the horizontal. If the coefficient of friction between the truck and the hill is 0.2, what is the acceleration of the truck? Ignore all other forms of friction. Show all work.

A student measures the force required to stretch a spring a certain distance and produces a graph of distance vs force, pictured below. If the spring being measured obey's Hooke's Law, how much force will be needed to stretch the spring 17 cm? A. 25.5 N B. 21.2 N C. 33.9 N D. 18.3 N

F (N) 20 15 10 x (cm) 5 10

A spring is compressed by 15 cm when 400 N of force is applied. What is the spring constant of the spring? A. 3491.4 N/m B. 2666.7 N/m C. 1892.9 N/m D. 2877.1 N/m

A spring scale is pictured below measuring two weights at the same time. Each weight is identical. Ignoring all friction, what will the spring scale read as the total weight? A. 0 N B. 50 N C. 100 N D. Impossible to tell

m 50 kg m 50 kg

You are working as a research assistant for a professor whose research area is thermodynamics. He points out to you that Daniel Fahrenheit used the best estimate of normal human body temperature as one of the points in defining the original Fahrenheit temperature scale. On the revised scale we now use, normal human body tem - perature is 9 8 . 6 8

According to the Bohr model, what is the ionization energy ( in eV ) needed to remove a ground - state electron from an \ ( O ^ { 7 + } \ ) Oxygen ion? ( Hint: Oxygen has an atomic number of 8 . ) 1 0 8 . 8 eV 8 7 0 . 4 eV 6 6 6 . 4 eV 9 5 . 2 eV

. ( 1 / 5 points ) Two moons orbit a planet in nearly circular orbits. Moon A has orbital radius r , and moon B has orbital radius 4 r . Moon A takes 2 0 days to complete one orbit. How long does it take moon B to complete an orbit? 2 0 days 4 0 days 8 0 days 0 6 1 6 0 days 3 2 0 days

How does Soldering work? Hint : - Think about temperature threshold

What coefficient of friction is required to stop a hockey puck sliding at 1 4 . 7 m / s initially over a distance of 6 0 . 5 m ?

A 0 . 1 5 0 - m - radis grinding whel,staring at rest, develops an angularsped of 1 2 . 0 rads in atime interval of 4 . 0 0 s . Whatisthe centripetal acceleration ofa point 0 . 1 0 0 m fom the center when the wheel is moving at an angular speed of 1 2 . 0 rad's?

a long solenoid with 1 3 . 5 turns / cm and a radius of 8 . 8 8 cm carries a current of 1 9 . 1 mA . A current of 1 2 . 6 A exists in a straight conductor located

Two weights are suspended from the ceiling by ropes as shown below. The left - hand weight, which has mass 2 5 kg , is attached to the ceiling by one rope which makes an angle of 4 5 with the horizontal. A second rope attached to this weight makes an angle of 3 0 with the horizontal, passes over a pulley and is then attached to the second weight,

If the near point distance N = 2 1 . 5 9 c m , the eyepiece focal length f e y e = 5 . 6 5 mm , the distance between the lenses D = 2 1 . 1 5 c m , and the total magnification of the microscope M = 4 7 2 , what is the absolute value of the power of the objective lens? Enter your answer in units of diopters, inverse meters. For example, if your

Question 2 7 ( 5 points ) Chapter 1 0 : In the process of fixing a flat tire, a motorist sets their spare tire, which has a radius of 0 . 3 m , down next to the car, not realizing that they are stopped on a hill. The tire begins rolling down hill, traveling 5 0 m before it comes to a stop. If it took the tire 2 5 seconds to roll down the hill,

The mass and radius of Earth are ME and RE , respectively. The mass and radius of the Moon are approximately and , respectively. The acceleration due to gravity on the surface of Earth is g . The acceleration due to gravity on the surface of the Moon is most nearly A . g B . 1 / 6 g C . 2 g D . 6 g

a horizontal pipe of 3 5 cm cross sectional area carries water at a speed of 2 . 5

A parent wants to build a see - saw to play with their child. Due to the difference in mass between the parent and child, the pivot must be shifted, so that their masses are balanced. The board used for the see - saw is 5 m long. If the pivot was originally placed at the midpoint, how far and in what direction, must the pivot be shifted to balance

The neutrino does not Multiple Choice interact with other particles. have energy. have momentum. have mass. have electric charge.

1 0 miles / hr is equivalent to q , Hint: 1 mile = 1 . 6 0 9 3 4 K m K m h r , round to the nearest whole number. a . 1 6 b . 1 7 C . 1 6 . 0 9 d . 1 6 . 1

Simple Harmonic Motion assignment for Lesson 1 1 Name q , Period and Frequency What is the definition of period? What is the symbol for period, and what are its units? b ) What is the definition of frequency? What is the symbol for frequency, and what are its units? c ) What is the relationship between period and frequency? What is the period of a

Imagine that a circular current loop is immersed in a magnetic field B parallel to the axis of the loop. The magnetic field depends on time in this way B ( t ) = A sin ( wt ) . Find the voltage produced at the ends of the loop. If the wire has a resistance ro , what will be its current?

A hockey puck traveling at speed v on essentially frictionless ice collides elastically with one end of a straight stick lying flat on the ice. In this collision

Suppose your bicycle tire is fully inflated to a pressure of 7 . 0 0 x 1 0 5 Pa at a temperature of 1 8 . 0 C . What is the pressure after its temperature has risen to 3 5 . 0 C ? Assume no leaks or changes in volume.

A woman of mass 5 8 kg jumps off the bow of a 5 8 kg canoe that is intially at rest. If her velocity is 1 m / s to the right, what is the velocity of the canoe after she jumps?

Water is circulating through a closed system of pipes in a two - floor apartment. On the first floor, the water has a pressure of 3 . 4 x 1 0 5 Pa and a speed of 2 . 1 m / s . However, on the second floor, which is 4 . 0 m higher, the speed of the water is 3 . 7 m / s . The speeds are different because the pipe diameters are different. What is the

A horizontal block - spring system with the block on a frictionless surface has total mechanical energy E = 4 7 . 0 J and a maximum displacement from equilibrium of 0 . 2 4 0 m . ( a ) What is the spring constant? ( b ) What is the kinetic energy of the system at the equilibrium point? ( c ) If the maximum speed of the block is 3 . 4 5 m / s ,

a heat lamp emits infrared radiation whos rms Electric field is Erms = 2 8 0 0 N / c

Question 1 8 ( Mandatory ) ( 1 point ) In the capacitor discharge formula q = q 0 e - t R C the symbol t represents: the time constant the time it takes for C to lose the fraction 1 e of its initial charge the time it takes for C to lose the fraction ( 1 - 1 e ) of its initial charge the time it takes for C to lose essentially all of its initial

a Geiger counter is filled with 1 mol of argon gas at pressure P = 9 5 0 2 Pa and temperature T = 2 1 . 1 . The atomic mass of argon is

In the circuit diagram, R = 5 9 . The battery is rated at 1 2 V , and can produce 1 0 0 0 mAxhour of charge before it stops working. How long will this battery last in this circuit? ( Assume the emf of the battery stays at 1 2 V the whole time. ) a ) 1 6 , 8 0 0 s b ) 1 0 , 8 0 0 s c ) 2 3 , 6 0 0 s d ) 1 2 , 4 0 0 s e ) 3 6 , 0 0 0 s

Determine the net torque on the 3 . 5 - mm - long uniform beam shown in the figure. All forces are shown. Calculate about point point PP at one end. Take counterclockwise torques to be positive. Express your answer using two significant figures.torques to be positive. Express your answer using two significant figures.

1 0 . A planet of mass M is in an orbit of eccentricity e = 1 where 1 , about theSun. Assume the motion of the Sun can be neglected and that only gravitational forcesact. When the planet is at its greatest distance from the Sun, it is struck by a comet ofmass m , where m M traveling in a tangential direction. Assuming the collision iscompletely

Energy flow at interface Consider the flow of energy at the interface between vacuum and a medium with index of refraction, \ ( n \ ) . Light from the vacuum side is incident on the interface. Conservation of energy tells us that the incident power should be equal to the sum of the reflected and transmitted power. However, we notice that the

For an object to be in "Static Equilibrium", the sum of forces applied in each direction and the sum of the moments about any point must be equal to zero

Assume that a 7 . 0 - c m - diameter, 5 0 W light bulb radiates all its energy as a single wavelength of visible light.

A long straight wire carrying a current of 2 . 5 8 A moves with a constant speed v to the right. A 5 turn circular coil of diameter 1 2 . 5 cm , and resistance of 3 . 2 5 , lies stationary in the same plane as the straight wire. At some initial time the wire is to the left of the coil at a distance d = 2 . 0 0 cm from its center. 3 . 0 0 s later,

A small particle has charge - 2 . 5 0 CC and mass 1 . 1 0 1 0 4 kgkg . It moves from point AA , where the electric potential is VAVA = 1 2 0 VV , to point BB , where the electric potential VBVB = 8 8 0 VV is greater than the potential at point AA . The electric force is the only force acting on the particle. The particle has a speed of 4 . 0 0 m /

What is the person's displacement [ in meters ] during the time interval between t = 1 . 0 s and t = 1 0 . 0 s .

The question reads: A capacitor with parallel circular plates of radius R = 2 . 1 0 cmR = 2 . 1 0 \ , \ text { cm } is discharging via a current of 2 4 . 5 A 2 4 . 5 \ , \ text { A } . Consider a loop of radius R / 3 R / 3 that is centered on the central axis between the plates. ( a ) How much displacement current is encircled by the loop? The

Doug uses a 2 5 NN horizontal force to push a 4 . 5 kgkg crate up a 2 . 1 mm - high, 2 0 frictionless slope. What is the speed of the crate at the top of the slope?

If N 0 is the number of photons during a fixed time interval that are incident on the material, and N is the number of photons that pass through a thickness x of material in that same time interval, explain why N = N 0 e - x . 6 3

An enterprising diver reasons that if a 2 0 . 0 cm long snorkel tube works, then a 5 . 5 6 m long tube should also work. If he foolishly uses a tube with this length, then what will be the pressure difference between the external pressure on him and the air pressure in his lungs? Assume that he is in fresh ( not salty ) water.

Suppose you take and hold a deep breath on a chilly day, inhaling 2 . 2 LL of air at 0 C C and 1 atmatm pressure. Assume that the air consists entirely of nitrogen and that the pressure of the gas stays constant as it warms to your core body temperature of 3 7 C C . How much heat is supplied by your body to warm the air?

An object is 2 4 . 0 cmcm from the center of a spherical silvered - glass Christmas tree ornament 6 . 4 0 cmcm in diameter.

Continuing from the last problem: The system will spin about its center of mass! Calculate the distance between the old center of mass of the rod ( in cm ) and the new center of mass, now that the projectile is attached.

The specific gravity of an object is 0 . 9 0 2 , whereas that of seawater is 1 . 0 2 5 . What percent of an object is about the surface of the water?

Water at zero degrees Celsius will contract when it is

A solenoid that is 8 5 . 9 cm long has a cross - sectional area of 1 8 . 7 cm ^ 2 . There are 1 2 2 0 turns of wire carrying a current of 6 . 7 4 A . Calculate the energy density of the magnetic field inside the solenoid. Find the total energy in joules stored in the magnetic field there >

1 ) A sealed box has a volume of 5 liters. Assume it contains 2 moles of ideal gas at a temperature of C . a ) How many gas molecules are there in the box? b ) What is the pressure of the gas? c ) Without changing the box, the gas inside is slowly heated up to C . What is the pressure of the gas now?

A cylindrical container with a cross - sectional area of 6 1 . 2 cm ^ 2 holds a fluid of density 7 9 6 kg / m ^ 3 . At the bottom of the container the pressure is 1 1 8 kPa. Assume P _ at = 1 0 1 kPa. What is the depth of the fluid? Find the pressure at the bottom of the container after an additional 0 . 0 0 2 2 5 m ^ 3 of this fluid is added to

An astronomer is measuring the light emitted by a binary star system. One of the stars appears to be much more massive than the other. The astronomer notices that the smaller star orbits the larger one in a nearly circular orbit at a distance of r = 7 8 3 r = 7 8 3 1 0 6 1 0 6 km . Through careful observation, she measures the smaller star's

A 5 0 0 g mass on a horizontal spring oscillates with a period of 2 . 1 2 s and an amplitude of 7 5 . 0 cm . During one oscillation, at the instant the spring is at maximum extension, the mass explodes into two pieces. One piece is shot forward, away from the spring, at 2 . 0 0 m / s . The second piece, which remains attached to the spring,

Light with a frequency of 2 . 9 3 1 0 1 5 Hz ejects electrons from the surface of zinc, which has a work function of 4 . 3 3 eV . What is the minimum de Broglie wavelength of the ejected electrons?

A satellite orbits the earth in a circular path. What force is responsible for keeping the satellite in orbit

Consider an 8 0 kg person on Earth ( g a ) What is their weight? = 9 . 8 ms - 2 ) . b ) c ) d ) ( 2 marks ) Which describes weight: scalar, displacement, force, pressure or work? ( 2 marks ) If the person is moving vertically upwards at a constant velocity, what is their acceleration? ( 2 marks ) In part c ) , what can you say about the net force

Find the energy of the ground state ( n = 1 ) of a proton in a one - dimensional box of length 5 . 6 nm . Answer in units of meV. 0 1 1 ( part 2 of 4 ) 1 0 . 0 points Calculate the wavelength of electromagnetic radiation emitted when the photon makes a transition from n = 2 to n = 1 . Answer in units of m . 0 1 2 ( part 3 of 4 ) 1 0 . 0 points

A Faraday Pail consists of a small cylinder within a large cylinder, where the ends of the cylinders are open. The inner and outer cylinders have a height of 1 6 . 7 9 cm and 1 9 . 5 3 cm , respectively, as well as an inner and outer diameter of 8 . 1 cm and 1 1 . 3 cm , respectively. Determine the percent difference ( % ) between two models of

Convert 2 3 . 0 C to: ( a ) Degrees Fahrenheit ( b ) Kelvin

A wheel that is initially at rest has forces applied to it , as shown in ( Figure 1 ) , and it begins to rotationally accelerate. Calculate the net torque about the axle of the wheel shown in ( Figure 1 ) . Assume that a friction torque of 0 . 7 5 m Nm N opposes the motion. Express your answer using two significant figures.

Iodine has a half life of 8 . 0 4 days. What percentage of a initial sample remains after 4 2 days

A 5 0 0 g metal sphere is heated to 3 0 0 C , then dropped into a beaker containing 3 0 0 c m 3 of mercury at 2 0 . 0 C . A short time later the mercury temperature stabilizes at 9 $ 0 C . Identify the metal. ( The density of H g = 1 3 . 6 g c m 3 , specific heat of H g = 1 4 0 J K g K .

A stream of electrons is of energy E is incident on a potential barrier of height U and thickness d . Even though U > > E , 5 % of the electrons tunnel through the barrier. If the thickness of the barrier decrease to 0 . 2 3 d , what percentage of the electrons will tunnel through? Enter an integer.

Question # 2 7 p t s Thiston cylinder device includes 1 . 5 m 3 of a gas at a temperature or wuring this expansion process, the work done by 1 . 0 0 k J k g . K Determine: Determine: a ) the mass of the gas in kg b ) the heat transferred by the gas during the expansion in kJ

A 7 . 8 0 - g bullet moving at 6 8 0 m / s penetrates a tree trunk to a depth of 4 . 5 0 cm .

Physics 1 0 9 General Physics I Assignment 8 The Conceptual Questions are worth 5 points each, the Complete Solution Questions are worth 1 0 points each. You will be graded on the physics content of your answer as well as on its structure and conciseness. For the whole assignment, remember, as with everything, neatness counts. Conceptual

Problem 2 : Image formation by refraction ( 1 0 pts . ) An object in an aquarium ( like a fish or a ruler ) will appear closer than it is if you look at it head on , as shown in the figure. Consider an object at point P which is a distance of s = 2 0 c m behind the edge of the aquarium tank. The tank is filled with water

At what temperature is the Celsius scale and Fahrenheit scale read the same temperature

A mass of 5 kg lies on an inclined plane making an angle of 4 5 to the horizontal. Friction force is 1 0 N up the incline. ( a ) Resolve the force up and down the incline. ( b ) Find the acceleration. ( c ) Find the normal force.

. For how long did the light have to travel to reach Webb s primary mirror? a . 4 1 , 0 0 0 , 0 0 0 years b . 4 1 , 0 0 0 years c . 4 1 0 0 years d . 4 1 years

A bottle is on a supermarket conveyor belt. The bottle has a mass of 1 kg with a centre of mass height of 2 0 cm . Its radius is 5 cm . If the belt has an initial acceleration of 1 m / s 2 , does the bottle topple when the belt is turned on ? draw the FBD

If electric and magnetic field strengths vary sinusoidally in time at frequency 1 . 1 6 GHz , being zero at t = 0 , then E = E 0 sin ( 2 ft ) E = E 0 sin ( 2 ft ) and B = B 0 sin ( 2 ft ) B = B 0 sin ( 2 ft ) . Part ( a ) When are the field strengths next equal to zero? Give your answer in seconds. Part ( b ) When do the field strengths reach

Kepler's Second Law demonstrates that the greatest orbital velocity of an object orbiting the sun is at:

How many times larger is this than the 0 . 2 5 nmnm diameter of the atoms?

A simple pendulum swings with a period of 3 . 7 seconds. What is the period if the mass of the pendulum is doubled? T = seconds What is the period if the length of the pendulum is doubled? T = seconds

why increasing body size helps maintain core body temperature. how a layer of fat helps insulation. how the fur reduces heat loss. why you cannot see a polar bear with night - vision ( = IR sensitive ) goggles.

ou use a wrench to loosen a lugnut on a car wheel, but you add a pipe to increase the lever arm. It looks like this: If the total length of this tool is 0 . 9 m and the lugnut s radius is 0 . 2 7 cm , how much torque can you apply to the lugnut if you apply 8 5 0 N to the end of the tool? What is the mechanical advantage of this setup

What is the speed of light through water ( n = 1 . 3 3 ) ? a ) 3 . 3 8 x 1 0 ^ 8 m / sb ) 3 . 0 0 x 1 0 ^ 8 m / sc ) 2 . 2 5 x 1 0 1 8 m / sd ) 2 . 6 3 x 1 0 ^ 8 m / s

In order for Jack to hear Jill s voice, air molecules must travel from the lips of Jill to the ears of Jack. Is this true or false?

Density classification. Calculate the density of a hypothetical planet in our own solar system with a mass of 5 . 9 7 x 1 0 2 5 kg and mean radius of 1 2 8 0 0 km; give your answer in units of grams per cubic centimeter. ( Recall that density = mass per unit volume and V = 4 / 3 p r 3 . )

A spaceship in distress sends out two escape pods in opposite directions. One travels at a speed v 1 v 1 = + + 0 . 6 6 cc in one direction, and the other travels at a speed v 2 v 2 = 0 . 6 4 cc in the other direction, as observed from the spaceship. Part A What speed does the first escape pod measure for the second escape pod? answer in seconds

A bicycle wheel has an initial angular velocity of 2 . 5 0 rad / s . Part A If its angular acceleration is constant and equal to 0 . 2 0 0 rad / s 2 , what is its angular velocity at t = 2 . 5 0 s ? ( Assume the acceleration and velocity have the same direction ) Express your answer in radians per second. Activate to select the appropriates

An airplane, approching an airport for landing, had been asked to wait until the runway is clear. The plane flies a "holding pattern," which basically means it will fly in a circle at a constant height and speed. Suppose the 4 . 7 0 0 1 0 4 kg airplane has a speed of 3 8 0 . km / h and needs to fly in a circle with a radius of 5 . 4 5 km . To

A 1 2 - pack of Coca - Cola ( is initially at rest on a horizontal floor. It is then pushed in a straight line for 1 . 2 0 m by a trained dog that exerts a horizontal force with magnitude 3 6 . 0 N . Use work - energy theorem to find the final speed of the 1 2 - pack if ( a ) there is no friction between the 1 2 - pack and the floor, and ( b ) the

copper and aluminum are being considered for a high - voltage transmission line that must carry a current of 5 8 . 7 A . The resistance per unit length is to be 0 . 1 6 2 ohms / km . The densities of copper and aluminum are 8 9 6 0 and 2 6 0 0 kg / m ^ 3 , respectively. Compute ( a ) the magnitude J of the current density and ( b ) the mass per

A 2 . 0 - kg stone is tied to a 0 . 5 0 - m string and swung around a circle with a constant angular velocity of 1 2 rad / s . What is the net torque on the stone? Select answer from the options below 1 2 N m 0 N m 7 2 N m 6 . 0 N m 1 4 0 N m

horizontally off a cliff at 6 . 5 m / s and lands in the water 1 5 m from the base of the cliff. v = 6 . 5 m / s 1 5 m a ) How long does it take Mike to hit the water? ( 3 marks ) b ) How high is the cliff?

E 1 1 . An organ pipe closed at one end and open at the other has a length of 0 . 5 m . a . What is the longest possible wavelength for the interfering sound waves that can form a standing wave in this pipe? b . What is the frequency associated with this standing wave if the speed of sound is 3 4 0 m s ?

If the 1 0 0 . 0 kg horse runs a race with a velocity of 1 5 . 0 ms . If the horse runs for 5 . 0 minutes. Calculate the power ( in watts ) generated by the horse.

The force constant of a spring is 1 6 2 N / m . ( a ) Find the magnitude of the force required to compress the spring by 5 . 0 0 cm from its unstretched length. N ( b ) Find the magnitude of the force required to stretch the spring by 7 . 9 6 cm from its unstretched length. N

consider the standing wave in an organ pipe and the sound wave it produces. What do these two waves have in common? a ) same wavelength b ) same frequency c ) same velocity d ) all of the above e ) none of the above

Introduction to Measurement in the Physics Laboratory A Probabilistic Approach