Physics Questions and Answers November 24, 2022

Distinguish between spiral and elliptical galaxies in terms of the presence or absence of a disk component and halo component. How does this difference explain the lack of hot, young stars in elliptical galaxies?

An arrow is fired at 80 m/s at 30 from 1.5 m above the ground. The arrow hits a target 485 m away. How long does it take for the arrow to reach the target. What is the height of the target?

A 54.3kg ice skater is moving at 3.96 ms when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.800 m around the pole. (a) Determine the force exerted by the horizontal rope on her arms. (b) Compare this force with her weight by finding the ratio of the force to her weight.

Assume your kitchen refrigerator operates between the temperatures -6C and 27C. DA 50% Part (a) What is your refrigerator's maximum possible coefficient of performance?

30 In the figure above, a 24 kg boom of length 3 m is supported by a cable that has a breaking tension of 1050 N. The cable is perpendicular to the boom and is attached 2.25 m from the pivot. Find a) the maximum load that can be suspended from the end of the boom N b) The magnitude of the vertical force exerted by the pivot at maximum load N c)

The magnetic field has been measured to be horizontal everywhere along a square path of sides a 18 cm, as shown in figure. Along the bottom the average magnetic field is B6.84x105 T. Along the sides the average magnetic field is B 0.097 T. The total current in the area that is surrounded by the square path is out of the page and of magnitude I

A 398 turn coil has a radius r 6 cm and a resistance of 30 N. a) The coil is in a uniform magnetic field that is perpendicular to the plane of the coil. What rate of change of magnetic field strength will induce a current of 6 A in the coil dB dt b) If a rate of change of the magnetic field strength of 48.2 SI is required to induce a current of 6

As shown in the figure, a very long straight wire carrying a current of I is at a perpendicular distance d 11 cm from a point P. Point P is at the center of a circular arc of a radius R 4 cm that spans over an angle, and carries a current I 14 A. d 1,a) The magnetic field vector at point P due to the straight wire only is B003 1.82x105 T. Find

If a vector is given by A 3.425.93, what is the direction of this vector 0030 O 0 240 00210 0060

The electron mass is 9 x 1031 kg. What is the momentum of an electron traveling at a velocity of (0, 0, 2.5 x 108) ms kg. ms p What is the magnitude of the momentum of the electron p kg ms

In a 2013 episode of the show Breaking Bad, there is a scene in which Walter is going to steal a supply of methylamine from a train. The rails are a standard distance of 4 ft, 8.5 in. apart. Each rail can carry a current of 10 A and theyll carry current in opposite directions. A rail workers toolbox sits near the tracks. The base of the toolbox is

A particle of mass m is in a bound state with energy E and wave function (x), in the potential x 0 0 0. You want to find bound state energies in the range 0 L. Remember that E W for a bound state. c) Write down the continuity conditions for the wavefunction at x L. d) Using these continuity conditions, find the transcendental equation which

An electron moves with velocity v (6.3i 5.2)) x 104 ms in a magnetic field B (0.77i0.51j) T. Shy Determine the xcomponent of the force on the electron. Express your answer using two significant figures. VE AZO Fx Submit Fy Determine the vcomponent of the force on the electron.

A worker pushes horizontally on a 2300N refrigerator on a kitchen floor with a force of 28.0N. Check the true statements: a. If the refrigerator moves forward, this person feels it pushing back with less than 28.0N. b. The person always feels a 28.0N push from the refrigerator. c. The person feels a 28.0N push from the refrigerator if it does not

A proton traveling with a velocity of (4.41x106, 3.77x106, 0) ms moves into a magnetic field B (0.195,0.371,0) T. What is t experiences as it travels through the magnetic field

An object undergoing circular motion whose velocity changes experiences: A) A tangential and normal component of acceleration B) A moment of inertia C) A polar and cylindrical component of acceleration D) An impulse

A tightrope walker walks across a 30-m long wire tied between two poles. The center of the wire is displaced vertically downward by 1.0 m when he is halfway across. If the tension in both halves of the wire at this point is 6294 N, what is the mass of the tightrope walker? Neglect the mass of the wire. A) 85 kg B) 43 kg C) 74 kg D) 91 kg

We can magnify objects using a simple magnifying glass, that is, a single converging lens. What advantage is gained by adding a second lens (the objective lens) to the simple magnifier (the eyepiece) to create a compound (that is, multi-lens) microscope?

What era is described as the current geologic era where humans have had a huge influence on the environment and the decline of biodiversity of life on Earth? a. Holocene b. Anthropocene c. Paleocene d. Pleistocene

Air quality in Utah can sometimes deteriorate after a snowstorm. What is the most likely explanation? A. air near the surface cools more than air in the upper atmosphere because of snow cover creating temperature inversion B. trapping pollutants near the surface thermal inversion caused by rising cold air C. trapping pollutants near the surface

The schematic of an Ideal Differentiator is given below. Its Transfer Function is V For component values of RE M G(s) RF C s RE 10 C 100 nF ovo Plot the Poles and Zeros of this Transfer Function. Plot a Bode plot of the frequency response in amplitude and phase at a small range of frequencies.

A DeltaWye connected 12,800240v 3 phase transformer has a balanced load of 1000 resistive and 7502 inductive per phase. a. Find the secondary impedance b. Find the secondary current (angle not needed) c. Find the primary Phase current (angle not needed) d. Find the primary Line current e. Find the total 3 phase secondary power

A linear displacement sensor consists of a linear potentiometer as shown in figure 1. The value of the displacement of the cursor is designated Ax. 1. The effective travel of the potentiometer is 21 10 cm and its total resistance is 2R0. Deduce the expression of the resistances Rb(Ax) and Rh(Ax) of the potentiometer for a displacement Ax of the

There are many installations that make use of highvoltage sources for particular applications. For example, sandpaper is often produced by attracting the abrasive particles using voltages in excess of 100 kV to the paper after applying a layer of glue. Consider a system of this type shown in figure 2. 100 kV 2m Paper with glue applied d0.3 m Plate

The following circuit represents an astable circuit allowing the flashing of LED1 and LED2. Www R4 16.8 R5 10kQ C3 1uF 6 VCC V1 00 U DISCH TRIG THRES NE555 OUT CONT GND 3 kr V2 R7 1kQ LED3 R6 1kQ LED2 GND 1. Calculate the recurrence frequency of V 2. Calculate the duty cycle of the signal V 3. Represent the evolution of V and specify the

A concave mirror has a focal length of magnitude 8.0 cm. (a) If the image is real, what is the object location for which the magnitude of the image distance is one half the magnitude of the object distance? (b) Find the magnification of the image and state whether it is upright or inverted?

An object 2 cm tall is placed 20 cm in front of a converging lens that has a focal length of 15 cm. (a) Calculate the image position and height. (b) Where the object should be placed if the image is at 30 cm behind the lens?

A diffraction grating is made with 600 lines per millimeter is illuminated with violet light of wave length 400nm. (a) How many lines can be observed with this grating? (b) If the intense white light is incident on the same diffraction grating and the grating to screen distance is 2.75 m, find the distance on the screen between the 2 nd order

. **Question 1 Consider a truss structure composed of various interconnected members, subjected to both point loads and distributed loads. The material properties of each member are known. Design a systematic approach to perform a comprehensive structural analysis, taking into account factors such as external loading, member geometry, and support

Calculate the transfer function V2V1.gainV2V1 and phase angle for this filter circuit. Graph the frequency response of the gain and phase angle between f 1 Hz and f 1kHz with the different R1 values (10 and 100 ohms). The L1 and L2 values can be referred to as L since they do not need to be changed. L1 L20.02 H (20mH) R1 10 OR 100 Ohms R2 10

a) How many degrees Celsius is the temperature of the stove stone if it is 450 K b) By how many degrees (C) has its temperature changed if it was 295 K before heating c) How many degrees Fahrenheit is the change d) Estimate the average speed of the silicon atoms that make up the heated rock and describe in which direction they are moving. The mass

A car of mass 1218 kg moves with speed 28 ms on a level road. The road has a curve of radius 92 m as shown in the diagram. Find the minimum force (in newton) of friction between tyres and the road such that the car can move along the curve safely.

a) What is the maximum photon energy that could be emitted by the quantum system with the energy level diagram shown below Energy 7.0 eV 4.0 eV 3.0 eV 1.0 eV n 4 n3 n2 n 1 b) The minimum photon energy

A car is traveling at 20.0 m/s toward a brick wall. The wall is 200 m away, and the car reaches the wall in 4 sec. Calculate the acceleration of the car and the speed the car is going when it strikes the wall?

A 25 kg box rests on a smooth surface with two applied forces. One force is applied due East and has a magnitude of 100 N. The second is applied at an angle of 37 degrees North of East and has a magnitude of 50 N. Show all work and calculate the net force acting on the box.

Assume your hometown is growing so rapidly that another water tower is necessary to meet the needs of the community. Engineers predict that the water tower will need to hold1.0010 6 kilograms of water, with a density of999kilograms per cubic meter. a. If this tower is 50.0 meters high and spherical, what will the volume of the tower have to be? b.

A child of mass 30 kg is playing on a maypole swing in a playground. The length of rope is x 3.9 m long and at an angle of 60 to the horizontal as she swings freely in a circular path. Ignore the mass of the rope in your calculations and find the speed of girl when she swings.

a. If the spring constant is 0.800N/m and the period of the mass's oscillation is 5.00s , what is the mass of the block? (Enter your answer in kg.) b. What is the angular frequency of the mass? (Express your answer in rad/s.)

562 kJ of heat are added to a sample of gas causing the gas to expand. As the gas expands, it does 600 kJ of work on its surroundings. What is the change in internal energy to the gas? Enter the numerical value in units of kJ.

A quantum simple harmonic oscillator consists of an electron bound by a restoring force proportional to its position relative to a certain equilibrium point. The proportionality constant is 9.41 N/m. What is the longest wavelength of light that can excite the oscillator?

You are working as a spectroscopist, analyzing absorption data for electromagnetic radiation incident on molecular gases. In one experiment, you wish to measure the effective spring constant of a diatomic molecule, consisting of two atoms, each of mass 1.67 10 27 kg.You know that two masses vibrating on the ends of a spring can be modeled as one

Nm mm2 m1 m2 (See the example Molar Specific Heat of Hydrogen Gas.) When a pure gas of these diatomic molecules is irradiated, an absorption occurs at a wavelength of 2.27 m. Determine the spring constant (in Nm) that you record in your lab notebook for this molecule.

1. A positively charged glass rod is bought close to a suspended metal needle. What can we say about the charge on the needle given that the needle is : a)attracted? b)repelled? 2. How would you determine the sign of a charge on a body using an electroscope? 3. You are given two metal spheres mounted on portable insulating supports. How would you

A file cabinet150kg mass, has been pushed up a ramp at an angle of35 o show how much force parallel to ramp required ? Ignore friction.

Dory the fish is swimming east at 45 m/s while singing at a note at 455Hz. Her friend Nemo is swimming towards her, westward at a speed of 38 m/s. What frequency or note will Nemo hear as he approaches Dory? They are both swimming in salt water where the speed of sound is 1540 m/s.

Consider a 1mmdiameter surface area of carbon (graphite). Calculate how many atoms would exist in energy levels from which they could emit radiation at wave lengths shorter than 700 nm (visible light and shorter wavelengths) for surface temperatures of 300 K, 1,000 K, and 5,000 K when the solid is in thermal equilib rium at those temperatures.

Mr. Licht starts pulling a wagon (mass 25.0 kg) from rest along a horizontal sidewalk. The sidewalk provides a frictional force of 75 N on the wagon. A. If Mr. Licht pulls on the handle with a horizontal force 85 N, what will be the speed of the wagon after 4.0 s (Draw a free body diagram of the forces acting on the wagon.) B. C. After pulling

A young's double-slit experiment is performed with green- blue argon light with =515 nm, the slit separation is 0.4mm . (a) At what angle is the 2 nd order located? (b) If the slit to screen distance is2.75m, find the distance on the screen between the 2nd order maximum and central maximum. (c) Find the distance on the screen between the 3 rd

For the pipe shown below, assume that the radius in wider part is 6 cm and narrow part is 4.5 cm. If the fluid is initially moving at a rate of 2 m/s in the wider part, what is the velocity in the narrow part?

PA P2 A

Consider a heavy rod of mass 1 kg and length 5 m, pivoted at a point as indicated in fig. shown below. The rod is applied for a force FT of magnitude 160 N at an angle of 42 as indicated in the fig. below. What is the net torque produced in the system in this case?

FT160 N 34 42 1.0 m

Two vectors A and B are defined as given here A 1.55 5.293 B 1.35 i 5.28 j Find the magnitude of A B and write your answer with 3 sig fig

If the mass ob the object is 2 kg, what is the change in gravitational potential energy from point A to point B 40m A TIT TTTTTT B 25m 777

In a uniform electric field, it takes 0.94 seconds for an object with charge 6.8 C and mass 9.55 x10 -5 kg to accelerate from rest to 1.94 x10 3 m/s. How strong is the electric field?

(a) Taking the molecular axis as the z-axis, assign the d orbitals with explanation and calculate x. (b) Calculate the CFSE for a diamagnetic d 8 linear complex

Shown below is the crystal field splitting for a linear complex. Mn 9.1 Dq 7.4 Dq

Consider operators P and Q acting on the space of square integrable functions L. The product of any two operators is defined as (PQ)(f) P(Q(f)), where fe L. (a) Using the definition of the hermitian conjugate of an operator (u, Tv) (Tu, v), express the hermitian conjugate of the product of operators PQ in terms of the hermitian conjugate of P

Suppose the voltage at node 1 is 8 V relative to the voltage at node O, and the voltage at node 2 is 2 V relative to node 0, calculate the current magnitude and direction in the 5 k2 resistor. 7 (1) 3 3mA 2 (2) 5 1

The slender sleeve A slides with velocity u relative to the curved rod. At the same time, the rod rotates with angular velocity around the fixed point B. Let the x-y axes be fixed to the rod, and calculate the Coriolis acceleration for the sleeve at the moment illustrated in the figure.

y B L u A d

In a one-dimension collision demonstration, ball 1 is 60.8 grams and moves at 3.9 m/s, and ball 2 is 21.3 grams and moves at velocity v2.The two balls collided and stuck together and moved at a final velocity of 1.2 m/s after the collision. Find the velocity v2 of ball 2 before collision in SI units? Write just the numeric answer with 3 sig figs.

A set of six cars on a roller coaster passes over a crest with a radius of 18 m, shown at position A in the figure to the right. The speed at the crest is 30 km/h. Neglecting friction, calculate the speed at position B? Assume that all six cars have the same mass.

B 18 m U A 30 kmh 18 m

A current of 1 A flows in the conductors forming a closed circuit with lengths of 30, 40, and 50 cm on each side as shown in the figure. The circuit lies in the table plane and a uniform magnetic field of 0.5 T is applied in the +y direction. (a) Find the magnitude and direction of the magnetic force acting on a portion of the circuit consisting

y 40 cm 50 cm I B 30 cm I X

A 25kg box is pulled along a horizontal surface by a 48N force that is applied at 35 degree above the horizontal plane. Calculate the normal force supporting the block?

Audible sound waves have frequencies ranging from 50 to 20000 Hz. explain, with examples, how audible sound waves of different frequencies are generated?

A sleeve A can slide frictionlessly on a rod B, which is mounted in a frame. The rod is mounted at an angle of 30 degrees to the horizontal plane. What acceleration a is required for the sleeve to remain in the position shown in the figure?

B A 30 a

A refrigerator is cooling a space at-5 o C by transferring heat to the atmosphere which is at20 o C.The objective is to reduce the temperature in space to-25 o C.Calculate the minimum percentage increase in work required, assuming a carnot refrigerator for the same amount of heat removed.

Lithium, beryllium, and mercury have work functions of2.90eV, 4.98eV, and4.50eV, respectively. Light with a wavelength of3.6310 2 nmis incident on each of these metals. (a) Which of these metals emit photoelectrons in response to the light?, why? (b) Find the maximum kinetic energy for the photoelectrons in part (a). (c) Calculate the stopping

632 nm electromagnetic wave (ray) in glass arrives at the glass-water interface at an angle of 48deg with the normal (travelling from glass to water). The refracted ray, in water, makes a 72deg angle with the normal. The index of refraction of water is 1.33. (a) What would be refractive index of glass? (b) What would be the speed of light in the

A particle of mass 1kg is undergoing small oscillation about the equilibrium point in the potential V(x) 212 for x0. a) Find the stable equilibrium point and potential at that point. b) Find the time period (in seconds) of the oscillation. For a onedimensional system with the Hamiltonian H 2 2q a) Find the Hamiltons equations. b) show that there

Consider the circuit below. Assuming the switch has remained in the down position for a long time, the magnitude of the currents through the capacitor and inductor immediately after the switch contacts the upper resistor are 5V M 12 5V M 5 a. capacitor current 1 A, inductor current 0 A b. capacitor current 1 A, inductor current 4 A c.

Q1 (a) A straight long conducting wire has a circular crosssection with a diameter of 2 mm. The current through the wire is 1 A and is uniformly distributed in the crosssection. Find the current density. (b) Find the force applied to a point charge q 10 C located at (1,2,3) m within a uniform electric field E 0.6 a 0.8 Vm. (c) Given the

Two small marbles, A and B, move in a clockwise direction in concentric circular grooves of radii 0.2 m and 0.3 m, respectively, on a smooth horizontal table. The mass of A is 0.02 kg and the mass of B is 0.03 kg. The speed of A in its groove is 0.2 ms and that of B is 0.9 ms . Calculate,(a) the angular velocity of B (b) the total moment of

A scooter is traveling at a constant 21m/s when it passes a car with their friend inside. The friend starts the car and accelerates at 4.5m/s 2 . If it takes 5.0 seconds to get the car started and their seatbelt on, how far will the car travel before it catches up to the scooter?

A wind turbine is used to transform the wind energy into the electrical energy. The power input of the wind to the wind turbine is 12 kW. How much mass of air per second (kgs) is passing through the wind turbine for this power input if it passes with a speed of 18 ms (Hint you are asked to find mt when the moving wind has KE).

In first gear, a motorcycle engine produces 902 Nm of torque on the rear wheel. If the rear wheel is lifted off the road and free to spin without friction, how long will it take the engine to spin the wheel from rest to 200 revolutions per minute (corresponding to the outer part of the wheel moving at approximately 24 km/h) if the wheel were on

A basketball player with a mass of 112 kg can jump 0.92m into the air during a slam dunk competition. How fast (km/h) must he jump (vertically) to achieve this jump?

A student with a mass of 50 kg is holding a 10 kg dumbbell her right arm while it is hanging down vertically beside her body. Q2(a) Calculate the weight of the student and the dumbbell. Q2(b) Draw a free body diagram for the dumbbell. Explain how you decided on the length of the arrows and how you labelled the diagram. Q2(c) Draw a free body

What is the sign of the potential energy and how does it change as the charge goes from i to f Potential energy is positive, and is increasing Potential energy is positive, and is decreasing Potential energy is negative, and is increasing Potential energy is negative, and is decreasing

The ocean floor is, on average, 4250 m below sea level. What is the water pressure in atmospheres at this depth? [The density of seawater is 1030 kg/m 3 ]

A certain region in space contains a uniform magnetic field of 300 G and a uniform electric field of 2.5 x 10 6 V/m. Find the total electromagnetic energy for this region?

A hot air balloon rises when you add air and falls when you remove washers. If I start out with a hot air balloon that has 18 washers, then add 48 pumps of air, how far up or down would the hot air balloon be?

Alexis is in her Toyota Camry and trying to make a turn off an expressway at 19.0 m/s. The turning radius of the level curve is 35.0 m. Her car has a mass of 1240 kg. Determine the net force.

A simple pendulum (mass 2.3 kg, length 1.2 m) is initially at rest. A 0.08 kg bullet (speed 21 m/s) is fired horizontally into the pendulum bob where it becomes lodged (i.e., inelastic collision). Due to the impact the pendulum swings back and forth with SHM. Find the magnitude of the angle (in degrees) from the vertical at a time of 0.38 seconds

Consider an atmosphere where the density is a constant. Use the ideal gas law and hydrostatic balance to show that the depth of such an atmosphere depends only on the surface temperature.

You are helping a friend move, and you need to load a box of books weighing 265kg. You slide the box up a ramp, which has an incline of 30.0D and a coefcient of static friction of 0.45. You apply a force on the box at an angle of 39.0 0 with respect to the ramp. a) Calculate the minimum force needed to slide the box up the ramp. b) Now you want to

A bird weighs 60.0 N and lands on the middle of a telephone line and depresses the line such that each half makes an angle of 10.0" with the horizontal. Determine the tension in the line?

Three masses are suspended as shown in the gure below. Determine the tension in the string between the 1.50kg mass and the 1.20kg mass.

2.00 kg 1.2 kg 1.5 kg

As part of her experimental equipment, an astronaut carries a simple pendulum that is 0.500 m long on her spaceship. Now that she has landed on the unexplored planet 18 Delphini b, she conducts an experiment to determine the acceleration due to gravity on that planet. She observes that her pendulum undergoes 10 complete oscillations in 25.9 s.

A fireman's water hose has a diameter of about 4.0 inches. The water is flowing through it at about 18.0 m/s. The nozzle's diameter drops to about 0.80 inches. If there is no friction, what would the exit velocity of the water be?

According to the web, it takes 18 kW hr to cook a turkey. How many microwave photons would a turkey have to absorb to be cooked? Suppose the photon energy in the microwave oven is (1.80x10 -24 ) J.

A photon is released during an electronic transition from the n=3 to n=2 energy levels within an atom. Given that the energy of this photon is 1.889 eV, determine the frequency of the associated electromagnetic wave?

A 4kg mass weighs 36.4N on the surface of a planet similar to earth. The radius of this planet is approximately 7.7 x 10 6 m. Calculate the mass of this planet. The value of the universal gravitational constant is 6.67259 x 1 0-11 Nm 2 /kg 2

7. A 1.0 kg block is released from rest at point A as shown, a vertical distance, h, above the tabletop. It slides down an incline track, around a circular loop of radius 0.5 meter, then up another incline that forms an angle of 30 with the horizontal. The block slides of the track with a speed of 4 meters per second at point C which is a height

(2) During the International Homecoming Race, Slick Suzy has a velocity of 13 m/s and then accelerates at 5.1 m/s 2 down the 200 m home straightaway. What is Suzy's speed at the end of the 200 m?

A record on a turntable starts from rest and speeds up to 45 rpm in 2.5 seconds before it begins playing. (a) What is the final angular speed of the record, in rads (b) What is the magnitude of the angular acceleration of the record (c) How many revolutions has the record completed during this time (d) The record then plays for 2.5 minutes. How

A 5600 kg rocket is floating in space. The scientists inside see an asteroid approaching and want to land on it to take samples. The asteroid is moving at 2.5 kms, forward and away from the rocket. (a) If the fuel is exhausted at 1.3 kms, what is the final mass of the rocket when it reaches the same speed as the asteroid (b) What mass of fuel was

Rhodamine WT is a fluorescent dye commonly used as for tracer studies in environmental settings. A mass of 10 g of rhodamine WT is injected into a stream with a constant cross- sectional area of 4 m2. The dye is rapidly mixed across the cross-section of the stream so that it can be considered at a 1-D point source along the direction of stream

A pencil on the end of a students compass draws a circle 8.0 cm in radius, starting at 3 oclock, or 0 at t 0 and moving counter clockwise. It takes the student 1.2 s to complete the circle. (a) What is the magnitude of the angular velocity of the pencil (b) What is the magnitude of the tangential velocity of the pencil (c) What is the magnitude

A beam is supported by identical springs at its ends and a concentrated force is applied at its center. The beam properties E and I and the spring constant k are known. Determine an expression for the vertical displacement at the center of the beam using Castigliano's second theorem?

Two 1 kg balls move away from each other, one traveling 6 m/s to the right, the other 4 m/s to the left. What is the magnitude of the total momentum?

Two 1000 kg cars drive east; the rst moving at 30 m/s, the second at 35 m/s. What is the magnitude of the total momentum of the system?

A string is tied at both ends. When tuning forks of various frequencies are struck near the string, it is found that only the 10 Hz and 20 Hz tuning forks cause the string to vibrate. Someone tells you that the 20 Hz mode is 2 modes higher than the 10 Hz mode. What is the LNRF (lowest natural resonant frequency) of the string?

a) What is the momentum of a bicyclist (total mass =100 kg) moving at 4 m/s? b) How fast must a person with a mass of 50 kg need to run in order to have the same momentum as the bicyclist?