How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Scott Your Own Question

Scott
Scott, MIT Graduate
Category: Homework
Satisfied Customers: 3040
Experience:  MIT Graduate (Math, Programming, Science, and Music)
3546829
Type Your Homework Question Here...
Scott is online now
A new question is answered every 9 seconds

would you help me out please

Customer Question

1.     An object 5 millimeters high is located 15 millimeters in front of a plan mirror. How far from the mirror is the image located?
A.     5.0 millimeters
B.     7.5 millimeters
C.     15 millimeters
D.     30 millimeters
2.     Which of the following values represents an index of refraction of an actual material?
A.     0
B.     1
C.     1
D.     5
3.     Which one of the following types of electromagnetic radiation causes certain substances to fluoresce?
A.     Ultraviolet rays
B.     Infrared waves
C.     X rays
D.     Cosmic rays
4.     If a 72-candela light source is located at a distance of 3 meters from a surface, the illuminance on the surface is
A.     8 lux
B.     24 lux
C.     216 lux
D.     648 lux
5.     If you’re driving towards the sun late in the afternoon, you can reduce the glare from the road by wearing sunglasses that permit only the passage of light that’s
A.     polarized in a vertical plane
B.     polarized in a horizontal plane
C.     dispersed in a vertical plane
D.     dispersed in a spherical plane
6.     The term angle of deviation is used in reference to
A.     a polarizer
B.     a prism
C.     a lens
D.     an analyzer
7.     According to the information in your study unit, which of the following locations requires the highest illuminance?
A.     A residential stairway
B.     A school locker room
C.     A bank lobby
D.     A study area
8.     The unit for measuring the rate at which light energy is radiated from a source is the
A.     Angstrom
B.     Lux
C.     Lumen
D.     Candela
9.     Compared to yellow light, orange light has
A.     the same frequency
B.     a faster wave velocity
C.     a longer wavelength
10.     The image formed by a convex spherical mirror will always be
A.     inverted and smaller than the object
B.     upright and smaller than the object
C.     inverted and larger than the object
D.     upright and larger than the object
11.     When an object is placed 8 millimeters from a concave spherical mirror, a clear image can be projected on a screen 16 millimeters in front of the mirror. If the object has a height of 4 millimeters, the height of the image is
A.     2 millimeters
B.     4 millimeters
C.     8 millimeters
D.     12 millimeters

12.     Which of the following lenses is a converging lens?
A.     Double-convex lens
B.     Spherical-convex lens
C.     Plano-concave lens
D.     Convexo-concave lens
13.     A virtual image produced by a lens is always
A.     larger than the object
B.     smaller than the object
C.     located in front of the lens
D.     located in the back of the lens
14.     Which of the following frequencies falls in the range of RF waves used by commercial radio broadcasting stations?
A.     60 Hz
B.     6,000 Hz
C.     600,000 Hz
D.     6,000,000 Hz
15.     To use your left hand to determine the direction of the voltage developed in a moving conductor in a stationary magnetic field, you must point your
A.     thumb in the direction of the magnetic flux
B.     thumb in the direction of the electromagnetic force
C.     forefinger in the direction of the lines of force
D.     forefinger in the direction of the motion
16.     A complete circuit contains two parallel-connected devices and a generator for providing the electromotive force. The resistance of the first device is 12 ohms, the resistance of the second device is 4 ohms, and voltage developed by the generator is 40 V. What is the magnitude of the current flowing through the first device?
A.     3.33 A
B.     8 A
C.     10 A
D.     13.32 A
17.     A transformer has a primary voltage of 115 V and a secondary voltage of 24 V. If the number of turns in the primary is 345, how many turns are in the secondary?
A.     8
B.     72
C.     690
D.     1,653
19.An electric heating element is connected to a 110 V circuit and a current of 3.2 A is flowing through the element. How much energy is used up during a period of 5 hours by the element?
E.     352 Wh
F.     550 Wh
G.     1,760 Wh
H.     2,580 Wh
20. The magnitude of the voltage induced in a conductor moving through a stationary magnetic field depends on the______and the _________ of the conductor.
A.     length, speed
B.     distance, circumference
C.     resistance, current
D.     color, capacitance
21. If a bar of copper is brought near a magnet, the copper bar will be
A.     attracted by the magnet
B.     unaffected by the magnet
C.     repelled by the magnet
D.     made into an induced magnet
22. When all parts of a circuit are composted of conducting materials, the circuit is said to be
A.     parallel
B.     shorted
C.     open
D.     closed
23. When an electron is displaced in a semiconductor, the hole that’s left behind is
A. attracted to the negative terminal of the voltage source
B. Incapable of carrying a charge
C. attracted to the anode of the voltage source
D. considered an impurity in the crystal
24. Including a full-wave rectifier in an AC circuit will yield a(n) _____ current.
A.     intermittent direct
B.     intermittent alternating
C.     continuous direct
D.     continuous alternating
25. Suppose that you’re facing a straight current-carrying conductor, and the current is flowing toward you. The lines of magnetic force at any point in the magnetic field will act in
A.     the same direction as the current
B.     a clockwise direction
C.     the direction opposite to the current
D.     a counterclockwise direction




Submitted: 11 years ago.
Category: Homework
Expert:  Dr WLS replied 11 years ago.
Before I (or someone else) answers your questions, you need to take another look at whether you omitted or incorrectly typed some. Specifically:
Question 2 has two choices that are the same. Shouldn't one of them be slightly larger than 1?
Question 9 probably needs a fourth choice. None of the other three are correct.
Question 15 was omitted.
I have the answers to the others, but would prefer to wait until I hear from you on this before posting them.

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Previous | Next >
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
  • He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX
 
 
 

Meet The Experts:

 
 
 
  • LogicPro

    LogicPro

    Engineer

    Satisfied Customers:

    4925
    Expert in Java C++ C C# VB Javascript Design SQL HTML
< Last | Next >
  • http://ww2.justanswer.com/uploads/ComputersGuru/2010-02-13_051118_Photo41.JPG LogicPro's Avatar

    LogicPro

    Engineer

    Satisfied Customers:

    4925
    Expert in Java C++ C C# VB Javascript Design SQL HTML
  • http://ww2.justanswer.com/uploads/BU/BusinessTutor/2012-2-2_115741_Kouki2.64x64.jpg Manal Elkhoshkhany's Avatar

    Manal Elkhoshkhany

    Tutor

    Satisfied Customers:

    4538
    More than 5000 online tutoring sessions.
  • http://ww2.justanswer.com/uploads/LI/lindaus/2012-6-10_04811_IMG20120609164157.64x64.jpg Linda_us's Avatar

    Linda_us

    Finance, Accounts & Homework Tutor

    Satisfied Customers:

    3138
    Post Graduate Diploma in Management (MBA)
  • http://ww2.justanswer.com/uploads/chooser77/2009-08-18_162025_Chris.jpg Chris M.'s Avatar

    Chris M.

    M.S.W. Social Work

    Satisfied Customers:

    2602
    Master's Degree, strong math and writing skills, experience in one-on-one tutoring (college English)
  • http://ww2.justanswer.com/uploads/JawaadAhmed/2009-6-27_12137_SIs_SHadi.jpg F. Naz's Avatar

    F. Naz

    Chartered Accountant

    Satisfied Customers:

    2126
    Experience with chartered accountancy
  • http://ww2.justanswer.com/uploads/JK/jkcpa/2011-1-16_182614_jkcpa.64x64.jpg Bizhelp's Avatar

    Bizhelp

    CPA

    Satisfied Customers:

    1887
    Bachelors Degree and CPA with Accounting work experience
  • http://ww2.justanswer.com/uploads/avremote/photoa.jpg Seanna's Avatar

    Seanna

    Tutor

    Satisfied Customers:

    1781
    3,000+ satisfied customers, all topics, A+ work
 
 
 

Related Homework Questions