Physics Questions and Answers June 27, 2020

A converging lens (f 6.0 cm) is located 15 cm to the left of a diverging lens (f 3.0 cm). An object is placed 18 cm to the left of the converging lens. What is the final image location of the object relative to the diverging lens O 9 cm to the right of the diverging lens O 11 cm to the left of the diverging lens O 2 cm to the left of the

An image of height 10.0 cm is located 6.0 cm in front of a concave (diverging) lens of focal length f 9.0 cm. Determine the height of the object. O30.0 cm O 6.0 cm O 30.0 cm O 12.0 cm O 6.0 cm

In which circumstance does a converging mirror produce a virtual image When the object height is larger than the mirror size. O When the object distance is smaller than the focal length. O Under all circumstances. O Never O When the object distance is larger than the focal length.

The diagram shows a ray of monochromatic light passing through a semicircular glass block. The angle of reflection for the ray reflected off the boundary is 0 38. Incident ray Reflected ray Glass Ray emerging along the air glass boundary Air What is the refractive index of the glass O 1.62 O 1.27 0.50 O 1.79 0.62

Two cars have speakers mounted on their roofs which play identical have identical frequency of 450 Hz. One of the cars is moving with a speed of 14.5 ms toward a stationary observer on the roadside, and the other car is parked nearby. The speed of sound is 343 ms. What is the beat frequency heard by the observer O 19.9 Hz O 18.3 Hz 9.9 Hz 4.5 Hz

2. Using 1butyne as the starting material, write the necessary reactions to convert to the indicated products. (a) Butane (b) 1Butene (c) 2,2Dibromobutane (d) 2Pentane 3. Show how 2butyne can be converted into 2butene. 4. Using propyne as the starting material, carry out the following reaction sequences to give the following products. (a) 2Butyne

Consider the 1D harmonic oscillator. a) Find the normalized eigenstates of the annihilation operator a, denoted by |>, with eigenvalue in terms of the eigenstates |> of the Hamiltonian. Tip: get a recurrence relation, you will also need to use the Taylor series expansion of the exponential function. Does the eigenvalue have to be real? b)

A block weighing 40.0 N is suspended from a spring that has a force constant of 200 N/m. The system is un- damped and is subjected to a harmonic driving force of frequency 10.0 Hz, resulting in a forced-motion amplitude of 2.00 cm. Determine the maximum value of the driving force.

In Thomsons experiment, abcam of electron travelling at 2.652 107 ms is bent into a circular path in a magnetic field of induction 0.5 Whim normal to its path. Find the radius of circular path if emL76 1013 CAkg

A hydrogen atom in an excited state can be ionized with less energy than when it is in its ground state. What is n for a hydrogen atom if 0.850 eV of energy can ionize it

Atoms can be ionized by thermal collisions, such as at the high temperatures found in the solar corona. One such ion is C5, a carbon atom with only a single electron. (a) By what factor are the energies of its hydrogenlike levels greater than those of hydrogen (b) What is the wavelength of the first line in this ions Panchen series (c) What type

In Thomson, s experiment, an electron is accelerated from rest in an electric field through a P.D. of 400V.t then enters normally in the magnetic field of induction 104 Whm.Find the velocity of electron and the radius of curvature of the path.

What is the distance between the slits of a grating that produces a firstorder maximum for the second Balmer line at an angle of 15

Hydrogen spectrum wavelength. The Balmer series requires that nf 2. The first line in the series is taken to be for ni 3, and so the second would have ni 4.

A beryllium ion with a single electron (denoted Be3) is in an excited state with radius the same as that of the ground state of hydrogen. (a) What is n for the Be3 ion (b) How much energy in eV is needed to ionize the ion from this excited state

A singly ionized helium ion has only one electron and is denoted He. What is the ions radius in the ground state compared to the Bohr radius of hydrogen atom

A Venturi tube may be used as a fluid flow meter (see Fig below). If the difference in pressure is P1 P2 = 21.0 kPa, find the fluid flow rate in cubic meters per second, given that the radius of the outlet tube is 1.00 cm, the radius of the inlet tube is 2.00 cm, and the fluid is gasoline ( = 700 kg/m3).

Compute the daily evaporation from a free water surface if the wind speed is 32 km h-1 at 0.15 m height, water and air temperature are both 29 C and the relative humidity of air is 50%. Atmospheric pressure is 757 mm-Hg.

1. A boy threw a ball vertically upward. It returned to his hands after 9.8 s. (a) What was the balls initial speed (b) With what speed did it return to the boys hand (c) How high did it go 2. A photographer inside a helicopter descending vertically at 15 ms at an altitude of 55 m accidentally drops his camera. How long will it take the camera to

An engineer tests a new magnetic flux sensor consisting of a twodimensional square membrane, 3.50 cm on each side. The sensor measures the magnetic flux through the membrane. The engineer places the sensor so that it is parallel to and 6.75 cm above the xyplane in the field region. The edges of the sensor are aligned to the positive x and yaxes.

Jose, Michael, Frank, Alfredo, and Ariel, five friends, are in a group and everyone recorded their own seated heart rate (HR), standing HR, and seated recovery HR after performing 15 jumping jacks. Additionally, each person performed the recording three separate times for each scenario. Jose Michael Frank Ariel Alfredo 60 70 58 80 60 Seated 62 76

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If a tax system is designed to minimize the sum of the deadweight loss due to distorted incentives and the administrative costs of taxation, its principal goal is minimizing the tax burden. maximizing efficiency. maximizing equity. tax fairness. ,Brian and Luisa must pay an income tax. Both Brian and Luisa pay 10,000 in taxes each year, but Brian

Two forces F1 and F, act on the bolt. If the resultant force FR has magnitude FR and coordinate direction angles a and B, as shown, determine the magnitude of F, and its coordinate direction angles. Given F1 20 1b FR 50 lb a 110 deg B 80 deg FR

A 50.00 mL sample containing La3+ was titrated with sodium oxalate to precipitate La2(C2O4)3, which was washed, dissolved in acid, and titrated with 18.0 mL of 0.006363 M KMnO4. Calculate the molarity of La3+ in the unknown

Two alike balls with 15.0 kg mass and 25.0 cm diameter are suspended by two 35.0 cm wires. The entire apparatus is supported by a single 18.0 cm wire. The surfaces of the balls are perfectly smooth. (a) What is the tension in each of the three wires? (b) How hard does each ball push on the other one?

Determine the wind speed at a height of 50m if the wind speed at a standard 10m height at the site is 10ms. Assume the air density at height 10m is almost is equal to 1.20 Kgm2. The site is located at the center of the city with a tall building. Estimate the wind speed at 50m height. If all buildings around the site are demolished so that the site

In a lab, one of your partners determines that the area an object is 25.9730cm2.. Your calculator tells you that the uncertainty is 0.04382361 cm. Write the appropriate measurement and its uncertainty. (A SA) ( ) cm The accepted value of the density of brass is given by 8.470 0.001 gcm. The volume of a cylinder is T R L If the length of the

Four particles A, B, C and D are distributed in four energy levels E, 0 , E, E2 28 E3 38 It is not dissolved, provided that the total energy of the system is E68 What is the number of macroscopic cases and the number of microscopic cases for each case of this system

Which budget format (lineitem, program, or performance) do you find the most informative and beneficial? Justify your answer

2 5 6 Aim 1 2 Apparatus Theory 4 5 Least count Slno PSR(mm) Pitch of the screw Least count (LC) To find the thickness of the given wire and sphere using a screw gauge and hence to find their volumes. Screw gauge, thin wire, small sphere and meter scale. 3 Volume of the given wireIrh in m (a) Elearning Physics Lab World University of Bangladesh

Two identical solid spheres of mass 1.5 kg and radius 50 cm are kept at a distance 5m from each other. The moment of inertia of system along an axis passing through centre of mass of the system and perpendicular to the axis joining centres of spheres (1) 12.37 (2) 19.04 (3) 25.15 (4) 29.37

Find equivalent resistance across AB 202 20 A 20 32 3 30 (1) 12 (2) 2 2 (3) 32 (4) 4 2

6. Dimension of mass in terms of velocity V, time T and force F will be (1) V2 T F (2) V T F (3) V T F3 (4) V T2 F

A mass m moving with velocity 40 ms suddenly breaks into two masses of ratio 1 2. The smaller block has velocity 60 ms in same direction. Find percentage loss in kinetic energy of system (1) 12.5 (2) 25 (3) 30 (4) 40

A varying magnetic field exist in space as follows B Bo cos(kzot) two charge particles qi 4t V2 coulomb and q2 2n coulomb placed at 0.0 (a0) and 0,0, and moving with equal velocities of k 0.5ci then find the ratio of force on two charge at t 0 sec. is (1) 2 (2) 4 (3) 6 (4) 8

A capacitor of capacitance 200F is connected to a 200V battery. Dielectric material of dielectric constant 2 is introduced in between the plates of the capacitor. Find change in energy stored in the process K 2 200LF 200uF ce 200V 200V (1) 6J (2) 4J (3) 3J (4) 2J

13. A capacitor of capacitance 200F is connected to a 200V battery. Dielectric material of dielectric constant 2 is introduced in between the plates of the capacitor. Find change in energy stored in the process K 2 H 200uF 200F 200V 200V (1) 6J (2) 4J (3) J (4) 2J

A simple pendulum of having time period T. If its length becomes of the initial length and placed inside 1 liquid of density p, which is times of the density of bob, then find the new time period of the pendulum. 4 4 2 (1) 3 (2) 3 (3) 3 (4) 4

Find equivalent resistance across AB Reson 20 20 A 22 20 32 B (1) 12 (2) 22 (3) 3 2 (4) 4 2

The eigenfunction for OHS for n1 is of the form (x) 1 (0) (12) 2 Ax exp( px) with value p. mo and energy E w a. Write the form of the function as a solution of the Schrodinger equation for this OHS (y(x,t)) b. Draw the wave function and energy levels of this OHS until n 4.

In one gas turbine power plant, air at 10 C and 1 bar is compressed to a pressure of 4 bar with a 100 efficient compressor. The air is then heated up in a 100 efficient heat exchanger and in the chamber. Burn to a temperature of 700 C. If the total pressure loss at the heat exchanger and the combustion chamber is 0.14 bar, calculate the power

What happens when a monochromatic x-ray beam is incident on the following? a. A stationary single crystal. b. A rotating crystal c. A crystalline powder. d. Powdered glass

When performing the alignment process for one of the antennas, it was found that the standing wave ratio, which means that the loss 1.2 VSWR RL back to it 20.91 dB 30.5 dB 19.85 dB 18. 5 dB

In the series connection below, what are the respective power consumptions of R, R2, and R3 R R www 4 V6V P13 W P23W and P3 3 W OP10.5 W P21 W and P3 1.5 W P11.5 W P21 W and P3 0.5 W O P11 W P22 W and P3 3 W R3 6

An annular antenna with a frequency of 100 operating at a frequency, the resistance m has a wavelength of 2.2, the radiation has 160 14 32000 14 60 4 0.8 14

B. Explain why dimensional quantities like Plancks constant cannot be arguments of some functions like the exponential function eh Plancks constant has units kgm h s Hint. The exponential function e can be represented using an infinite sum, 1x6 k Investigate o. C (5 points) The ideal gas law states that a gass pressure P ) depends upon its volume

When the resistor R in (Figure 1) is 35 N, the high resistance voltmeter reads 9.3 V.When R is replaced by a 8.4S2 resistor, the voltmeter reading drops to 7.7 V. Figure V R HT ,Part A What is the emf of the battery Express your answer to two significant figures and include the appropriate units. E Value Units X Incorrect Try Again 5 attempts

Two tubes of diameter 1cm and 2cm are filled with mercury to a height of 50cm. The tubes are open to atmosphere. Now pressure at the bottom of the mercury column will be? a. The same for both Sides B. Higher for tube of 2cm C. Higher for tube of 1cm

If the pressure drop in a H 2 O pipeline with a turbulent flow is 25 psi for a standard/ordinary steel pipe. What would the pressure drop be if the copper pipe was used? use the roughness coefficient. assume the other values needed.

Water flow laminarly through a tube of diameter 1cm. The average water velocity is auv and the maximum velocity is umax. Then A. umax = 1.5 uav B. umax = 2 uav C. umax = 2.5 uav D. umax = 3uav

A long straight wire with current I.e Find the magnetic flux density of point P.e The distance between point P and wire is d. P.

a twodimensional Consider Bravais lattice that is left invariant after rotation by angle around the origin. Suppose the lattice to have points at (0, 0) and (a,0). By requiring the image of (a, 0) under rotations through 10 to be in the Bravais lattice, find a simple expression that implicitly specifies all possible rotation axes.

A cooling fan is turned off when it is running at 850 revmin. It turns 1350 revolutions before it comes to a stop. (a) What was the fans angular acceleration, assumed constant (Answer 0.47 rads2) (b) How long did it take for the fan to come to a complete stop (Answer 190 s) (c) How many revolutions would it take in 50 s. (Answer 614 rev)

A cooling fan is turned off when it is running at 850 revmin. It turns 1350 revolutions before it comes to a stop. (a) What was the fans angular acceleration, assumed constant (Answer 0.47 rads2) (b) How long did it take for the fan to come to a complete stop (Answer 190 s) (c) How many revolutions would it take in 50 s. (Answer 614 rev)

A cooling fan is turned off when it is running at 850 revmin. It turns 1350 revolutions before it comes to a stop. (a) What was the fans angular acceleration, assumed constant (b) How long did it take for the fan to come to a complete stop (c) How many revolutions would it take in 50 s.

1-ft3 of air is contained in the spring-loaded piston cylinder device shown in figure below. The spring constant is 5 lbf/in, and the piston diameter is 10 in. When no force is exerted by the spring on the piston, the state of the air is 250 psia and 460F. This device is now cooled until the volume is one-half its original size. Determine the

Spring D FIGURE P461E

A infinitely long hollow cylindrial solenoide Radius ae j, (Am) There are suface current density over the solenoid surface and the degree is 30 as the figure below showne Find the magnetic flux density.

For the cross section in problem 1 (which is also shown below), you are asked to determine the moment of inertia about x axis or ly. Show all the necessary steps. y x YA 2 in 1 in 0.5 in 7 1 in 4 in Drawing is not to scale

The 30kg cart is acted upon by the harmonic force shown in the figure. If e 0, determine the range of the driving frequency w for which the magnitude of the steadystate response is less than 75 mm. k 1080 Nm 30 kg F 25 cos ot N

The air above the surface of a freshwater lake is at a temperature T4, while the water is at its freezing point T, where T, T,. After a time t has elapsed, ice of thickness y has formed. Assuming that the heat, which is liberated when the water freezes, flows up through the ice by conduction and then into the air by natural convection, prove that

At some hight h = 1.7 m, a mini roller coaster of mass 2.4 kg starts to fall from rest. It then loops through a circular path of radius R = 0.45 m (see figure). Ignore all kinds of friction, and take g = 9.81 m/s^2. (a) Find the speed of the roller coaster when it goes across the top of the circle (point A) (in m/s). (b) Find the magnitude of the

h

(Q1) Find the relation between induced charge and free charge when a dielectric material of dielectric constant K is placed between the plates of a parallel plate capacitor. Hence discuss the dielectric constant of metal.

Plot the following function: f(x)=Sin(n/L) x ; 0xL; n=1,2,3,4.

Example of an object that transform or convert light energy to other energy 1) Light energy to mechanical energy 2) Light energy to heat energy 3) Light energy to sound energy 4) Light energy to chemical energy 5) Light energy to electrical energy

The following table of elevations and energy levels correspond to an NBA basketball travelling straight up and down. The basketball has a mass of 0.600 kg. height h (meters) GPE (Joules) KE (Joules) E(Joules) 5.00 4.00 3.00 2.00 1.00 0.00 0.00 29.4 What is the gravitational potential energy (GPE) at height 5.00 m O 29.4 J O 0.00 J O 23.52J 11.76 J

The electromotive force of an electric cell is 2V and its internal resistance is 0.25ohm. Parallel combination of two resistors of 5 ohm and 15 ohm is connected to the cell. Calculate the current flowing through each resistor.

The spectrum between two slits in a Yongs double slit experiment is 2.0mm. The width of the fringe found at a distance of 1m from the slit is 0.295mm.Calculate the wavelength of light.

A light of wavelength of 810 -7 m incident on a plane transmission grating produces the angle of diffraction of 30for first order. What is the no. of lines per cm in the grating?

Three conductors of resistances of 10, 50 and 150 are connected in series and 250 V is applied across the resultant resistance. Calculate the potential difference between the terminals of each of the resistors.

FermiDirac statistics applied to undifferentiated particles function waveform antisymmetry and are subject to the principle of Pauli exclusion such as .. Electrons and Molecules O Mesons and fermions O Protons and photons O Positrons and muons

For the network of Fig. 2.171, sketch v o and iR. 10 V I kQ Si I k2 10 V FIG. 2.171 Problem 26.

A soil profile consists of three in the table Q4. Calculate the equivalent coefficients layers with the properties shown of permeability parallel and normal to the stratum. Table Q4 layer 1 2 3 Thickness z(m) 3.0 4.0 3.0 Kx (parallel, ms) 2.0106 5.0108 3.0x105 K. (normal, ms) 1.0106 2.5108 1.5x105 II) Water flows through a 100 mm diameter granular

A company has the following alternatives for investment. Using the incremental BC method. determine which alternative should be selected. Assume i 10. Cost new Annual OM Cost Annual income Estimated life (yr) A 20,000 1,000yr 5,600yr 7 B 24,000 800yr 5,700yr 8 16,000 2,200yr 5,400yr 9 Note Incremental BC method should be used in the solution.

On the same line, and assuming that it is well maintained (ytrack defects 0.2 ms 2). Calculate the acceleration that the passengers will experience when running on the same curve with a conventional train at 160 kmh Souplesse coefficient 0.2, railhead 70 mm

Write an equation (any form) for the quadratic graphed below 4321 y 3 2 3 4 2 3 4

Many things in nature wiggle in a periodic fashion. That is, they vibrate. One such example is a simple pendulum. If we suspend a mass at the end of a piece of string, we have a simple pendulum. Here, the to and fro motion represents a periodic motion used in times past to control the motion of grandfather and cuckoo clocks. Such oscillatory

Which of the following statements is true regarding the variance or standard deviation of a portfolio of two risky securities Oa The degree to which the portfolio variance is reduced depends on the degree of correlation between securities. b. There is a linear relationship between the securities coefficient of correlation and the portfolios

1. What is the magnitude and direction of the vertical component of the reaction of the support at point A 2. What is the magnitude and direction horizontal component of the reaction of the support at point A 3. What is the magnitude and direction of the reaction of the support at point G 1,000 1b 2,000 Ib 600 Ib 8006 E V1000 Ib e20e20i

There is a medium in the vacuum space with permetivity and permeability e and u respectively. Mediums also have a conductivity. Review the surface of the medium. There are electromagnetic waves with a frequency of w that enter perpendicular to the surface according to figure 3 right. Known Ho4ew 1. (a) Look for em wave equations through Maxwells

A 100fold dilution (1100 dilution) of a 150 M solution of a substance produces a solution having a concentration of nM Describe the dilution series used to make a 100fold (ie 1100) dilution, (a) to prepare 250 l of the diluted solution (b) to prepare 5 ml of the diluted solution

1. Field between Two Wires (Score 10) There are two semiinfinite cylindrical wires of radius a that carry current I according to Figure 1. It is known that the width of the gap between the two wires is w and w a. When the current is turned on (when t0). plate in the gap is uncharged. Ignore the edge effect. (a) Determine the electric field E in

Consider a 6.0 g steel nail 8.0 cm long and a hammer that exerts an average force of 600 N on the nail when it is being driven into a piece of wood. The nail becomes warmer. What is the nails final temperature is? The specific heat capacity of steel is 450 J/kg C

We connect a 10 resistance to 10 V. Calculate: a) The intensity that circulates b) The potency c) The energy consumed if the resistance is left connected for 24 hours.

A hair dryer has the following indications: 230V and 2300 W. Calculate the internal resistance of the dryer and the current intensity.

12 A circulates through the resistance of an electric oven when connected to a power difference of 110 V. Determine how much heat is produced in 5 minutes.

A 100 W bulb is connected to a socket whose potential difference is 110 V. Calculate: to. The resistance of the filament. b. The intensity of the current that passes through the filament. c. The energy that passes through the filament in 1 minute. d. The charge that passes through the filament in 1 minute.

A person initially at rest starts to walk 2 m towards north, then 1 m towards east, then 5 m towards south and then 3 m towards west. What is the position vector of the person at the end of the trip?

5. Express the following vectors in Cartesian coordinates (a) p(22 1)a, pz cos pas (b) r sin Ocosoa, r cos 0 cos pa, r sin a,

Make kinematic sketch, describe the types of all the links and joints, and determine the degree of freedom of the jaw crusher mechanism shown in Fig. 26. Fig. 26 Jaw crusher mechanism

1. A boy throws a stone from the top of a cliff into the sea. When the stone leaves his hand, it is travelling horizontally at a velocity of 10 ms. a. How long will it take the stone to reach the sea, distance 8 meters below b. How far from the bottom of the cliff will it be when it enters the sea c. What will its vertical velocity be when it hits

2. A golfer hits a ball from horizontal ground, giving it an initial velocity of 35 ms at an angle of 25o to the horizontal. a. Where will the ball be 2.5 seconds after it is hit b. What will be the greatest height reached by the ball c. Where will the ball land

Write 2word problem about projectiles that will show its application in real life. You must also provide the complete solution for these word problems.

We connect a 10 resistance to 10 V. Calculate: The energy consumed if the resistance is left connected for 24 hours.

Let, A p(z 1), pz cos ps pzz and B r cos p, 2r sin p COS At T(3, 4, 1), calculate (a) A and B,

1.1. In the table below, a number in the top row represents the pressure of a gas in the bulb of a constant-volume gas thermometer (corrected for dead space, thermal expansion of bulb, etc.) when the bulb is immersed in a water triple-point cell. The bottom row represents the corresponding readings of pressure when the bulb is surrounded by a

Ajetliner has a cruising air speed of 610 mih relative to the air. You may want to review (Page). For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Relative velocity on the highway.,How long does it take this plane to fly roundtrip from San Francisco to Chicago, an eastwest flight of 2000 mi each way,

A single phase 220V Normal service load of IB 20A is fed by a copper cable of 16mm conductor size and 50m long. Calculate its voltage drop and its drop percentage, Note P Resistivity of the copper 23.70mmkm (cose0.8) Select one O 3.2V, 18 1.87V, 2.5 2.37V, 1.08 4.25V, 3.56