Physics Questions and Answers November 07, 2022

Question A coil with 200 turns is placed in a magnetic field where the magnetic flux changes at a rate of 0.02 Ts. If the coil has an area of 0.1 square meters, what is the induced electromotive force (EMF) in the coil

Question A wave with a frequency of 500 Hz travels through a medium with a speed of 340 ms. What is the wavelength of the wave

Question A gas cylinder contains nitrogen gas (N) at a pressure of 2 atmospheres and a temperature of 273 Kelvin. The cylinder has a volume of 5 liters. Calculate the number of moles of nitrogen gas in the cylinder.

Calculate the amount of water (g) produced by the combustion of 16 g of methane.

Solve for 'x' in the equation: 3x + 7 = 22.

The flagpole is 6 meters tall. At a certain time of day, it casts a shadow that is 10 meters long. What is the height of a nearby building if it casts a shadow that is 15 meters long at the same time?

Determine the specific speeds of the following singlestage pumps and specify the type of pump which probably be used for each. Pump a PO r.p.m. 1150 885 675 625 9.p.m. 3500 12000 20000 9000 Total Head (ft) 100 15 50 18 2. A sixstage pump delivers 1500 g.p.m. against a net pressure rise of 700 lb per square in. What is the specific speed if it

A circuit consists of a resistor with a resistance of 10 ohms and a battery with an emf of 12 volts. What is the current flowing through the circuit and the voltage drop across the resistor?

Find the derivative of the function f(x) = 3x^2 + 2sin(x) - ln(x).

A car accelerates uniformly from rest to a speed of 25 m/s over a distance of 200 meters. Calculate the acceleration of the car

The refractive index of diamond is 2.42. What is the meaning of this statement in relation to speed of light? Describe an activity to draw a magnetic field line outside a bar magnet from one pole to another pole.

What is the difference between enantiomers and diastereomers in stereochemistry?

Explain with the help of a diagram, why a pencil partly immersed in water appears to be bent at the water surface.

Eye of an observer

A gas initially at a temperature of 300 K undergoes an isothermal expansion from an initial volume of 2.0 L to a final volume of 4.0 L. The gas absorbs 500 J of heat during this process. Calculate the work done by the gas during the expansion.

If a business unit generated 3,600,000 in BEFORE TAX PROFIT and had invested capital of 18,000,000 BUT had excellent terms with its suppliers so had CREDITORS of 2,000,000 and the Weighted Average Cost of Capital (WACC) for this business is 16. Calculate the Economic Value Add (EVA) for this business unit and select which of the following is

Management has a strategic long-term goal to increase market share by 5% in 5 years. For this year, the goal is to increase sales and net income over the last year. Department managers have identified opportunities for revenue growth (i.e. the customer perspective) and process improvements (i.e. internal process perspective). Develop a strategic

(i) If two similar large plates, each of area A having surface charge densities +a and -a are separated by a distance d in air, find the expressions for (a) field at points between the two plates and on outer side of the plates. Specify the direction of the field in each case. (b) the potential difference between the plates. (c) the capacitance of

(a) Explain, using suitable diagrams, the difference in the behaviour of a(i) conductor and(ii) dielectric in the presence of external electric field. Define the terms polarization of a dielectric and write its relation with susceptibility.(b) A thin metallic spherical shell of radius R carries a charge Q on its surface. A point charge Q/2 is

Q A 2Q

Two point charges 4 (J.C and +1 pC are separated by a distance of 2 m in air. Find the point on the line-joining charges at which the net electric field of the system is zero.

(a) Derive an expression for the electric field E due to a dipole of length 2a at a point distant r from the centre of the dipole on the axial line. (b) Draw a graph of E versus r for r >> a. (c) If this dipole were kept in a uniform external electric field diagrammatically represent the position of the dipole in stable and unstable equilibrium

(a) Derive the expression for the energy stored in a parallel plate capacitor. Hence obtain the expression for the energy density of the electric field. (b) A fully charged parallel plate capacitor is connected across an uncharged identical capacitor. Show that the energy stored in the combination is less than that stored initially in a single

Using Gauss law deduce the expression for the electric field due to a uniformly charged spherical conducting shell of radius R at a point (i) outside and (ii) inside the shell. Plot a graph showing variation of electric field as a function of r > R and r < R (r being the distance from the centre of the shell).

Define electric dipole moment. Is it a scalar or a vector? Derive the expression for the electric field of a dipole at a point on the equatorial plane of the dipole.

(a) Define electric flux. Write its S.I. unit.(b) A small metal sphere carrying charge +Q is located at the centre of a spherical cavity inside a large uncharged metallic spherical shell as shown in the figure the expressions for the electric field at points P 1 and P 2 .(c) Draw the pattern of electric field lines in this arrangement.

P. Free space Metal

(a) Define electric flux. Write its S.I. units. (b) Using Gausss law, prove that the electric field at a point due to a uniformly charged infinite plane sheet is independent of the distance from it. (c) How is the field directed if (i) the sheet is positively charged, (ii) negatively charged?

(a) Using Gauss law, derive an expression for the electric field intensity at any point outside a uniformly charged thin spherical shell of radius R and charge density a C/m2. Draw the field lines when the charge density of the sphere is (i) positive, (ii) negative. (b) A uniformly charged conducting sphere of 2.5 m in diameter has a surface

Question A line with rest wavelength 1000 nm is observed in a star to have a wavelength A 999 nm. What is the stars radial speed V, (in kms) and is it moving toward or away from us

The Zener diode, shown in the figure has zener voltage V 15 V and power rating of 0.5 W. If in (a) 750 (b) 1050 Vs 40 V, the minimum value of Rs being destroyed is 2 that prevents the (c) 540 (d) 250 Zener diode from Rs. wit Vz

Explain Dark Matter.

A 4.0kg-ceiling fan is placed 2.5m above the floor. What is the gravitational potential energy of the earth-ceiling fan system relative to the floor?

Three resistors with values of 6.8 ohms, 7.6 ohms, and 5.0 ohms are connected in parallel. What is the equivalent resistance of this combination?

Determine the fundamental frequency of the following ringoscillator. Each inverter has propagation delay of 500 ns. Da Da Do (a) 1 MHz (b) 333.33 kHz (c) 2 MHz (d) 166.67 kHz output

Two masses M1 and M2 are connected by light string, which passes over the top of a smooth plane inclined at 30 degree to the horizontal,so that one mass rests on the plane and the other hangs vertically as shown in figure. Initially at time t=0 masses (M1=15 kilogram and M2=10 kilogram) are held at rest and then they released. If after one second,

30 M M

A block of metal weighting 2 kilogram is resting on a frictionless plane. It is struck by a jet releasing water at a rate of 1 kilogram/second and at a speed of 5 meter/second . Calculate the initial acceleration of the block.

A sodium source emits light at appears to an observer as of 522 nm, who was moving at (a) 0.12 c towards the source (b) 0.12 C (c) 0.06 0 (d) 0.06c 589 nm which a copper green line away from the source. towards the source away from the source.

An electric vehicle has the following parameter values m, 1000 kg Cb0.24 A 2.1 m g 1.22 kgm 0.008 0.6x10x (r. vehicle speed in ms) The vehicle is on level (flat) road. It accelerates from 0 to 100 kmh in 10s such that its velocity profile is given by r(t) 0.29055t for 0 t 10s. (The mass factor is assumed unit) a. Define the traction force

Why is it important that a sample be random and representative when conducting hypothesis testing? Representative Sample vs. Random Sample: An Overview Economists and researchers seek to reduce sampling bias to near-negligible levels when employing statistical analysis. Three basic characteristics in a sample reduce the chances of sampling bias

A packed bed absorption tower produces carbonated water for beverages by continuously contacting a stream of carbon dioxide (CO) gas with a stream of liquid water. Pure mountain spring water, containing no dissolved CO2, enters the top of the column at a flow rate of 5 kmolmin. Pure CO gas at 2 atm is also fed in from the top of the tower at a

A fish in a water tank sees the outside world as if it (the fish) is at the vertex of a cone such that the circular base of the cone coincides with the surface of water. Given the depth of water, where fish is located, being h and the critical angle for water-air interface being i c , find out by drawing a suitable ray diagram the relationship

A converging lens has a focal length of 20 cm in air. It is made of a material of refractive index 1.6. It is immersed in a liquid of refractive index 1.3. Calculate its new focal length.

A convex lens made up of glass of refractive index 1.5 is dipped, in turn, (i) a medium of refractive index 1.6, (ii) a medium of refractive index 1.3. (a) Will it behave as a converging or a diverging lens in the two cases? (b) How will its focal length change in the two media?

A compound microscope uses an objective lens of focal length of 4 cm and eyepiece lens of focal length of 10 cm. An object is placed at 6 cm from the objective lens. Calculate the magnifying power of the compound microscope. Also calculate the length of the microscope.

Draw a ray diagram to show refraction of a ray of monochromatic light passing through a glass prism. Deduce the expression for the refractive index of glass in terms of angle of prism and angle of minimum deviation.

(i) Draw a neat labelled ray diagram of a compound microscope. Explain briefly its working. (ii) Why must both the objective and the eye-piece of a compound microscope have short focal lengths?

An illuminated object and a screen are placed 90 cm apart. Determine the focal length and nature of the lens required to produce a clear image on the screen, twice the size of the object.

With the help of a suitable ray diagram, derive the mirror formula for a concave mirror.

A singlephase stepdown transformer has a power rating of 100 kVA and a voltage ratio of 250005000 V, consider it has the following parameters. Rp 100 2, R. 40 S2, Xp220 2, X 100 2, Rc 200,000 2, Xm100,000 2, If the transformer delivers 100 kVA for 5000 V load with 0.7 lagging power factor, answer the following questions a) Sketch the equivalent

The importance of biodiversity.

Water flows in a pipe with a diameter of D1 and roughness height of e as shown in the figure below. Water exits from section B that has a diameter value of D2. The loss friction coefficient of the vane is denoted by Kvane. If the piezometer reading at section A is h, then find the flow rate in the pipe. (Ignore the head loss that may occur in

T of a 17 kg child storts from rest at the top 2.0m slide as shown in FIGURE Her 4.2 ms. How much speed work 2.0m at the bottom is is done by frictional forces fi 404 veft Vf

An ont crows on table top. A position the ant at a point with locotes coordinotes x 35 mm, y45mm to origin of the coordinate system in FIGURE Determine the magnitude and direction of this vect or y Bo X vector relotive

A vector A hos magnitude 5.1m and of 122 with the xoxis with its toil of mokes on ongle a) Drow the origin vector A the b) Determinete the components of A, ond write A in terms of the unit vectors and J.

Tension between air and water is 72 dynes/cm and the contact angle is 0 degree. Calculate: 1. Capillary rise of water in the tube if the tube radius is 0.01 centimeters 2. Difference in pressure in psi across air-water interface in the tube If the displacement pressure for a water saturated porcelain plate is 55 psi of air. What is the diameter in

(a) What is plane polarised light? Two polaroids are placed at 90 to each other and the transmitted intensity is zero. What happens when one more polaroid is placed between these two, bisecting the angle between them? How will the intensity of transmitted light vary on further rotating the third polaroid? (b) If a light beam shows no intensity

(a) What are coherent sources of light? Two slits in Youngs double slit experiment are illuminated by two different sodium lamps emitting light of the same wavelength. Why is no interference pattern observed? (b) Obtain the condition for getting dark and bright fringes in Youngs experiment. Hence write the expression for the fringe width. (c) If s

(a) State Huygens principle. Using this principle explain how a diffraction pattern is obtained on a screen due to a narrow slit on which a narrow beam coming from a monochromatic source of light is incident normally. (b) Show that the angular width of the first diffraction fringe is half of that of the central fringe. (c) If a monochromatic

Why does iodine absorb light? How does this affect cyanide?

What is momentum? Explain in detail the momentum of textile planes.

What is universe? How does this affect the structure and motion of the planets?

(a) A point object ?O? is kept in a medium of refractive index n 1 in front of a convex spherical surface of radius of curvature R which separates the second medium of refractive index n 2 from the first one, as show in the figure. Draw the ray diagram showing the image formation and deduce the relationship between the object distance and the

121 11 11 R

(a) Distinguish between linearly polarized and unpolarized light. (b) Show that the light waves are transverse in nature. (c) Why does light from a clear blue portion of the sky show a rise and fall of intensity when viewed through a polaroid which is rotated? Explain by drawing the necessary diagram.

(a) Describe briefly how a diffraction pattern is obtained on a screen due to a single narrow slit illuminated by a monochromatic source of light. Hence obtain the conditions for the angular width of secondary maxima and secondary minima. (b) Two wavelengths of sodium light of 590 nm and 596 nm are used in turn to study the diffraction taking

(a) In Youngs double slit experiment, describe briefly how bright and dark fringes are obtained on the screen kept in front of a double slit. Hence obtain the expression for the fringe width. (b) The ratio of the intensities at minima to the maxima in the Youngs double slit experiment is 9 : 25. Find the ratio of the widths of the two slits.

(a) Describe briefly how an unpolarized light gets linearly polarized when it passes through a polaroid.(b) Three identical polaroid sheets P3, P2 and P3 are oriented so that the pass axis of P 1 , P 2 and P 3 are inclined at angles of 60 and 90 respectively with respect to the pass axis of P 1 . A monochromatic source S of unpolarized light of

S P 0 P 0 P3

(a) How does an unpolarized light incident on a polaroid get polarized? Describe briefly, with the help of a necessary diagram, the polarization of light by reflection from a transparent medium. (b) Two polaroids A and B are kept in crossed position. How should a third polaroid C be placed between them so that the intensity of polarized light

(a) In Youngs double slit experiment, derive the condition for (i) constructive interference and (ii) destructive interference at a point on the screen. (b) A beam of light consisting of two wavelenths, 800 nm and 600 nm is used to obtain the interference fringes in a Youngs double slit experiment on a screen placed 1.4 m away. If the two slits

A cooling coil made of copper tube is immersed in a regulated constant temperature bath held at a temperature of 20 C. The liquid flowing through the tube enters at 22 C, and the coil must be sufficiently long to 1.8 Problems 29 ensure the exit liquid sustains a temperature of 20.5 C. The bath is so well stirred that heat transfer resistance at

Use the following tax rates and income brackets for 2015 to answer the following question(s). Josh earned $82,500 in taxable income, all from wages and interest, and files an individual tax return. What is the amount of Josh's taxes for the year 2015? Tax Rates Individual Returns Joint Returns 10% $0 to $9,075 $0 to $18,150 15% $9,076 to $36,900

A telephone poll asked 1269 registered voters Would you vote for the current vice president if he ran for president Of these 1269 respondents, 33 would vote for the current vice president if he ran for president. The administrators of the study concluded that 33 of all registered voters would vote for the current vice president if he ran for

The highest power per light beam is 5000 watts. The wavelength of the beam is 600 nanometers. How many photons of light will be produced per second?

The diameter of a moving electric block is 10 cm. The total external electrical voltage possessed by the block is 12 V. If water is passed through the section at a pressure of 1000 liters per minute, what will be the radial speed of the flow?

A car is moving at a constant speed of 30 m/s on a straight road. The driver sees an obstacle in front of the car and applies the brakes, due to which the car slows down by 4 m/s. How far does the car travel before coming to a complete stop?

A rock is dropped from a height of 88 ft. The height of the rock (in feet) above the ground t seconds later (for 0 t 2) is given by s(t) 16t 64. a. Find the average velocity of the rock over the interval 0.49,0.5 b. Find the average velocity of the rock over the interval 0.5,0.51 c. Use the information from part a and b to guess the

The equation of motion of a particle moving under a constant acceleration is shown below. x(t)50cm(2cms)t(0.0650cms)t What are the particles initial position, initial velocity, and acceleration, respectively

What is periodic motion and it is measured in Henry, but what causes it?

What is Einstein's coherence theory?

Find out the coulomb energy difference for mirror nuclei using separation energy.

A Carnot engine is working between 300C and 1000C. Calculate the increase in efficiency if (i) if the temparature of the source is raised by 200C and (ii) the temperature of the sink is lowered by 200C.

The density of sodium chloride is 2.18g/cc. Given that the crystal has fcc structure. Determine the lattice constant. Molecular weight of NaCl = 58.5.

Calculate the noload voltage gain and output voltage of the RCcoupled transistor amplifiers of Fig. Calculate the overall gain and output voltage if a 4.7 kN load is applied to the second stage, and compare to the results of part (a). Calculate the input impedance of the first stage and the output impedance of the second stage. V25 V o H 10 F 15

Leading strand vs. lagging strand replication.

What is the difference between conductors and insulators in terms of their electrical properties?

How does the principle of conservation of momentum apply to collisions?

For each of the following processes, indicate and briefly explain whether (delta)S is less than, equal to, or greater than zero, or whether there is insufficient information to decide (Note that (delta)S refers to the system) i. Melting of ice in room at 25C ii. reversible melting of ice at OC iii. reversible adiabatic expansion of ideal gas iv.

Let S be the space generated by the vectors, (1, 2, 3, 4) X X2 (1, 0,1,0) X3 (0, 2, 0,5) Find the distance between the vector y and the space S where y (0, 1, 0, 0).

Aaron is constructing the perpendicular bisector of RS. His work is shown. Aaron says that because the arcs do not intersect, this line segment does not have a midpoint. Kate disagrees and tells him he drew his arcs incorrectly and that he must redraw his arcs to determine the midpoint. Who is correct Explain your reasoning. X

Heat dissipated from a machine in operation can cause hot spots on its surface. Exposed hot spots can cause thermal burns when in contact with human skin tissue and are considered to be hazards at the workplace. Consider a machine surface that is made of a 5mmthick aluminum with a thermal conductivity of 237 WmK. During operation the machine

A particle moving along the xaxis has its position given by the function, t 1 x (t) t2 t 4 for all t 2. What is the acceleration of the particle when

The concentration of schottky defect in ionic crystal is 1 in 1010 at a temperature of 77C. Estimate the average separation in terms of the lattice spacing between the defect at 77C and calculate the value of the concentration to be expected at 727C.

The density of schottky defect in a certain sample of NaCl is 5x1011 m11 at 25C. If the internoic distance NaCl is 2.82Armstrong, what is the energy required to create one schottky defect

Calculate the concentration of vacancies in copper at room temperature (25C). What temperature will be needed to heat treat copper such that the concentration of vacancies produced will be 1000 times more than the equilibrium concentration of vacancies at room temperature Assume that 20,000 cal are required to produce a mole of vacancies in

Calculate the ratio of the vacancies produced by copper atoms at 600C and 1100C given that the minimum energy required to remove an electron from the lattice site(Ev) for copper is 1.56eV.

1 in 90 men have prostate cancer. 85 percent of men who have prostate cancer test positive. 8 percent of this who test positive are false positives.What is the probability that the man does not have cancer if he tests positive.

Analyze major ethical issues in marketing research. Marketing research plays a crucial role in shaping the decisions of businesses and organizations, but it can also raise important ethical issues that need to be addressed. In this assignment, you will explore some of the main ethical issues in market and marketing research and analyze their

What is Chandrayaan-3 Mission?

A dentist's lamp has a visible light luminosity of 1.1 joules per second. If the lamp is moved to a distance of X meters away from a patient's teeth, what is the flux of the lamp on the teeth? Then, making a reasonable estimate of the surface areas involved, how much energy shine from the lamp onto a single tooth over a time period of Y seconds?

The range of a projectile is directly proportional to the square of its velocity. If a motorcyclist can make a jump of 140 feet by coming off the ramp at 60 mph, find the distance the motorcyclist could expect to jump if the speed coming off the ramp were increased to 65 mph.?

State the difference between Biotic and Abiotic

State Kepler's planetary motion laws.