### Properties of laser beam

What properties of a laser beam are used in: (a)holography- (b)punching holes in baby bottle (c)monitoring location of the crater of a dormant volcano by interferometry- (d)laying straight railroad tracks-

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What properties of a laser beam are used in: (a)holography- (b)punching holes in baby bottle (c)monitoring location of the crater of a dormant volcano by interferometry- (d)laying straight railroad tracks-

The intensity of a particular earthquake wave is measured to be 2.09à?106 W/m2 at a distance of 123 km from the source. What was the intensity when is passed a point only 4.39 km from the source? Give answer in W/m2.

Refer to attached picture file. Each resistor in the following circuit is 6.00 ohms. What is the equivalent resistance between points a and b? Find the equivalent resistance of the resistors between points a and b. Find the power dissipated by the resistor identified with a star.

The noise from a helicopter rotor is distributed equally in all directions. If the rotor generates 70 watts of sound power, find the intensity level of the sound in dB on the ground directly beneath the helicopter when its altitude is 120 m. Also find the altitude in meters for the sound to be reduced to 60 dB at the same locati

It was stated that around the turn of the 20th century some researchers discovered that radium generated heat. Assuming that you have a pure 1 Ci sample of Ra-226, what is the maximum potential power (in Watts) that you could recover (at 100% efficiency) from this sample.

What is the power of a sound wave (B = 32 dB) passing through an area of 12.5 cm ^2? Suppose the same sound wave passes through an area of 25 cm^2. What is its intensity level?

Hi. Can someone please show me how to do the following problem? "The medium-powered objective lens in a laboratory microscope has a focal length f-objective = 4.00 mm. (a) If this lens produces a lateral magnification of -40.0, whiat is the distance from the object to the objective lens? (b) What is the focal length of an ey

A wire 1.2 m long and 0.4 mm diameter has a resistance of 4.9. Calculate the resistance of another wire of the same material whose length is 0.8 m and diameter is 0.24 mm.

Please see attached for diagram. If points A and B in the figure below are connected to a 10 V battery, what is the power dissipated in each of the resistors assuming that R = 65 ohms. 12 ohms resistor : 55 ohms resistor : 65 ohms resistor :

A turboprop producing 1000 kW drives a propeller operating at 85% propulsive efficiency. If the fuel flow to the engine is 0.07 kg/s, determine the overall thermal efficiency of the engine.

A turboprop engine produces a "Brake Specific Fuel Consumption" of 0.5 lb/bhp/hr. Determine the fuel flow (in kg/s) required at this bsfc to produce 800 bhp of power.

Hi, I need some assistance with the following physics problems. Please view the attachment to see the full set of questions.

Strontium-90 is to be used in a radioisotopic thermoelectric generator (RTG) for powering a navigation beacon located in the arctic. a) How much of the Sr-90 activity is required to generate 50 W of electric power if the conversion efficiency from heat to electricity is 30%? Tip: You must take into account the fact that Sr-90

Air at 15°C is compressed steadily and isothermally from 100 kPa to 700 kPa at a rate of 0.12 kg/s. The minimum power input to the compressor is: 1.0 kW 11.2 kW 25.8 kW 19.3 kW

The translation operator S(a), for arbitrary constant real vector a, is defined such that... a) Show, using the Taylor expansion of Φ(x-a) about x, that S(a) may be expressed in terms of the momentum operator p=.. Sum the expansion to give a simple closed-form expression for S(a). Please see attached for full question

The heating element of an electric broiler dissipates 2.8 kW of power when connected to a potential difference of 120 V. a. what is the resistance of the element? b. How much current does the broiler draw? use two ways to find out, and verify your answer.

1. What is the electric field strength E at a point 0.400 m from a point of charge of + 1.75 microC? a. 2.00 x 10^5 N/C b. 9.85 x 10^4 N/C c. 1.21 x 10^5 N/C d. 8.91 x 10^5 N/C 2. What is the Electric potential at a point 0.90 m away from a point charge of 2.5 mC? a. 10 MV b. 25 MV c. 35 MV

A 1100 kg car, starting from rest accelerates for 5.0 seconds at a constant 4.60 m/s^2. Determine the average power generated by the vehicle.

Sam, whose mass is 75 kg, takes off across level snow on his jet-powered skis. The skis have a thrust of 200 N and a coefficient of kinetic friction on snow of 0.1. Unfortunately, the skis run out of fuel after only 10 s. What is Sam's top speed? (in meters/second)How far has Sam traveled when he finally coasts to a stop? (in me

Hydrogen and Oxygen molecules in a gas sample have the same temperature. This means that the hydrogen molecules, on the average have the same kinetic energy and speed as oxygen molecule?

I would like for you to show me all of your work/calculations and the correct answer to each problem. 51. What is the gravitational potential energy, relative to the ground, of a 1.0-kg box at the top of a 50-m building? 55. A 0.20-kg stone is thrown vertically upward with an initial velocity of 7.5 m/s from a starting poi

A block with mass m has a coefficient of kinetic friction Mk with the floor. If the block is obeying Newton's 1st law while being pushed at angle 0 (theta), show that the power needed to push it at velocity v is given by P=Mkv(mg+fsin0)

Hi, I am having trouble doing these problems listed below. Please show me how to solve these problems for future reference. Thank you very much. 1. You are told that the volume of a sphere is given by V = pie d/4, where V is the volume and d is the diameter of the sphere. Is this equation dimensionally correct? (Use SI unit

Hi. Can someone please help me with the following problem? I'll try to draw the circuit (with battery and 4 resistors), but I don't know if all the spacing will come out right. The "///" are resistors. Basically, it's a circuit with a 15-V battery and 4 resistors. First you hit R1, which = 11 ohms. Then there are two paths

Question: An ac generator with a frequency of 1.00 kHz and an rms voltage of 24 V is connected in series with a 2000 ohm resistor and a 0.365 H inductor. (a) What is the power factor for this circuit? (b) What is the average power consumed by this circuit?"

"Three resistors (R, 1/2R, 2R) are connected to a battery. (a) If the resistors are connected in series, which one has the greatest rate of energy dissipation? (b) Repeat part (a), this time assuming that the resistors are connected in parallel."

Scott, riding for the Mercury team, won the 2002 Mt. Rushmore Hill Climb bicycle race with a winning time of 1 hour 50 minutes 20 seconds. The race is 28 miles in length with a total altitude gain of 7000ft. Scott weighs in at 130 lbs and his hill climbing bike weighs 17 lbs. The total weight of his water bottles, shoes, clot

The speed of a 4.0kg object is given by (2t) m/s, where t is in seconds. At what rate is the resultant force on this object doing work at t = 1 second? Answers: a) 48 W b) 40 W c) 56 W d) 16 W A 10kg object is initially at the top of a rise, at point A. It then moves down to point B. Choose point B to be your zero leve

1. A steam turbine at an electric power plant delivers 4500 kW of power to an electrical generator that converts 95 percent of this mechanical energy into electrical energy. What is the current delivered by the generator if it delivers energy at 3600 V? 2. A color television draws about 2.5 A when it is connected to

A block of mass 5kg is lifted 2 meters in 3 seconds. Compute the work done in joules and in ergs.