Physics

1.A megaphone amplifies sound byall the aboveincreasing the range of frequencies that can be produced.focusing sound energy into one specific direction.spreading out the sound waves over a large area.
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A plane monochromatic electromagnetic wave with wavelength =2. 0cm, propagates through a vacuum. Its magnetic field is described by >B =(Bxi^+Byj^)cos(kz+t), where Bx=1. 9106T,By=4. 7106T, and i^ and j^ are the unit vectors in the +x and +y directions, respectively. What is Sz, the z-component of the Poynting vector at (x=0,y=0,z=0) at t=0?
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A sound wave has a wavelength of 0. 96 m. How many times does this wave cause your eardrum to oscillate back and forth in 1 s?
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The pressure difference between two locations is 0.005 Torr .Which one of the following barometers is preferred to measure the small pressures accurately? (knowing that: Density of mercury = 13600 kg/m, density water = 1000 kg/m, density of oil = 800 kg/m A-Mercuric barometer B-Oil-water barometer C-Water barometer D-Oil barometer
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The graph shows how the speed of a car travelling in a straight line changes with time. Which section shows the largest acceleration? speed A B C D time
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What is the S-P difference (sec)?What is the amplitude (mm)?What is the distance (km)?What is the magnitude (M)?
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A rifle with a weight of 30 N fires a 5.0-g bullet with a speed of 300 m/s. (a) Find the recoil speed of the rifle. (b) If a 700-N man holds the rifle firmly against his shoulder, find the recoil speed of man and rifle.
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Which circuit would generate 2,016W of power?
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Galileo is often credited with the early discovery of four of Jupiter's many moons. The moons orbiting Jupiter follow the same laws of motion as the planets orbiting the sun. One of the moons is called Io - its distance from Jupiter's center is 4. 2 gigameters and it orbits Jupiter in 1. 8 Earth-days. Another moon is called Ganymede; it is 10. 7 gigameters from Jupiter's center. What is Ganymede's period in Earth days?
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when traveling at 55mph, how many feet do you need to stop?approximately 302 feetapproximately 303 feetapproximately 304 feetapproximately 305 feet
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The mass of a density bottle is 20g when empty 70g when full of water and 695g when full of another liquid. Calculate the density of the other liquid (take density of water as 1g/cm (2mk) Mass of 20cm of the liquid ()
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A particle is moving up an inclined plane. Its velocity changes from 15m/s to 10m/s in twoseconds. What is its acceleration?
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A simple pendulum and a spring-mass pendulum both have identical frequencies. How can you change them so that they will still have identical frequencies?
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A 720-kev (kinetic energy) proton enters a 0. 20-t field, in a plane perpendicular to the field. What is the radius of its path? s
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Assuming that the web acts like a spring, what is the spring constant of the web?.
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Electromagnetic waves give off energy. The electromagnetic spectrum shows us e______ the wavelength the _____ the frequency and the_____ the energy the wave carries.
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When one skater pushes another skater, how do they move? how can you predict the specific motion that will occur?
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Coherent light of frequency 6. 32 x 1014 Hz passes through two thin slits and falls on a screen 85. 0 cm away. You observe that the third bright fringe occurs at 3. 11 cm on either side of the central bright fringe. (a) How far apart are the two slits? (b) At what distance from the central bright fringe will the third dark fringe occur?
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Complete the statements by filling out the blanks. The goals of counseling include behavior change,andThe scope of counseling covers Individual Counseling,andPLEASE HELP me
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For problems 3,4, and 5, Consider an egg that has a mass of 0. 15 kg being held at the top of a flight of stairs. 3. If an egg has 11 J at the top of the stairs, what is the height of the stairs? 4. If the egg is dropped from that height, what is the Kinetic energy right before the egg hits the ground?5. If the egg is dropped down to the ground from that height, what is the velocity of the egg right before the egg hits the ground?
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What is the electric field at a point 0. 200 m to the right of a + charge ? Include sign to indicate the direction of the field. 1. 50^ * 10^ "-8" C a + or - ( Unit = N / C ) =Help please
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what is screw guage how does it work
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Both objects are released from rest and the pulley turns without slipping the coefficient of kinetic friction between the 2kg object and the surface is 0. 40. Calculate the angular acceleration of the pulley. a. 34. 25 rad/s^2b. 36. 17 rad/s^2c. 39. 22 rad/s^2d. 46. 57 rad/s^2
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A woman weighs 100 kg and wants to know the force that the heels of her different shoes put on the new carpet by standing on one foot. The different shoes, A, B, C, D have heels of area 1cm, 4cm, 8cm and 64cm.Which heel applies greater force to the carpet?Answer: ALL EQUAL^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^Answer: ALL EQUAL
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