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 Coolchics Your Own Question

Coolchics
Coolchics, Teacher
Category: Homework
Satisfied Customers: 432
Experience:  BA
508327
Type Your Homework Question Here...
Coolchics is online now
A new question is answered every 9 seconds

Mechanics

Customer Question

1.in which of the following units is acceleration expressed?
a-newtons
b-foot-pounds
c-kilograms
d-meters per second squared
2.a stone falls from a ledge and takes 8 seconds to hit the ground.the stone has an original velocity of 0 m/s.how tall is the ledge?
a-1,254.4 meters
b-313.6 meters
c-78.4 meters
d-39.2 meters
3.a tank with a flat bottom is filled with water at a height of 4 meters.what ia the pressure at any point at the bottom of the tank?(you can ignore atmospheric pressure when calculating yur answer)
a-4.0 kpa
b-9.8 kpa
c18.9 kpa
d-39.2 kpa
4.the ability of a material to tranfer hest or electric current is called?
a-insulation
b-porosity
c-conductivity
d-convection
5.a steel block has a volume of0.08 m3 and a density of 7,840kg/m3.what is the force of gravity acting on the block(the weight)in water?
a-5,362.56 N
b-6,150.64N
c-6,700.56 N
d-7,600.18 N
6.when an automotive battery is fully charged,the sulfuric acid and water mixture will have a specific gravity of about
a-0.15
b-1.0.
c-32.67N
d-1.96 kg
7.if an object has a mass of 20 kg,what is the force of gravitl acting on it on earth?
a-196 N
b-2.04 kg
c-32.67 N
d-1.96 kg
8.if a small-diameter open glass tube is partially immersed in a verssel containing mercury the surface of the mercury inside the tub will be
a-lower then the mercury in the vessel,and shaped like the outside of an ubrella
b-higher than the mercury in the vessel,and shaped like the outside of an ubrella
c-lower than the mercury in the vessel,and shaped like the inside of a bowl
d-higher then the mercury in the vessel,and shaped like the inside of the bowl
9.how much time should be allowed for a 605-mile car trip if the car will be travelingat an average speed of 55 miles per hour?
a-8.75 hours
b-9 hours
c-10.5 hours
d-11 hours
10.a machine is supplied energy at a rate of 4,000W and does useful work at a rate of 3,760 W.what is the efficiency of the machine?
a-92%
b-94%
c-96%
d-97%
11.what is the kinetic energy of an object that has a mass oa 30 kilograms and moves with a velcity of 20 m/s
a-2,940 j
b-5,880 j
c-6,000 j
d-12,000 j
12.if a gas has a gage oressure of of 156 kpa.it's absolute pressure is approximately
a-56 kpa
b-100 kpa
c-256 kpa
d-300 kpa
13according to ptolemy's model of the movement of celestial
bodies,
a-the earth rotates around the sun
b-the sun in the center of the universe
c-the earth rotates around the moon
d-plants orbit in circular path around the earth
14. a car with a mass of 1,200 kilograms is moving around in a circular curve at a uniform velocity of 20 meters per second.the centripetal force on the car is 6,000 newtons.what is the radius curve?
a-160 meters
b-80 meters
c-32 meters
d-16 meters
15.what force is requierd to accelerate a body with a mass of 15 kilograms at a rate of 8 m/s2.
a-1.875 kg
b-23 kg
c23 N
d-120 N
16.oil flows upward in the wick of a lantern because of the liquid property called
a-viscosity
b-capillarity
c-meniscusity
d.density
17a car travels from boston to harford in 4 hours.the two cities are 240 kilometers apart
what was the average speed of the car during the trip?
a- 4 km/hour
b36 km/hour
c- 69 km/hour
d-960 km/hour
18.which of the following is the term used to discribe a body's resistance to a change in motion
a-inertia
b-acceleration
c-gravity
d-mass
19.if the velocity of an abject changes from 65 m/s to 98 m/s during a time interval of 12 s,what is the acceleration of the object
a.2.75 m/s
b-5.42 m/s
c.13.58 m/s
d.33 m/s
20.an object has a mass of 120 kg on the moon.what is the force of gravity acting on the object on the moon?
a-12.24 N
b-20 N
c-196 N
d- 1,176 N
21.in a practical machine,the power output is______the power input
a-smaller than
b-larger than
c-equal to
d-multiplied by
22.if a stone with an original velocity of 0 is falling from a ledge and takes 8 seconds to hit the ground,what is the final velocity of the stone
a-39.2 m/s
b-42.6 m/s
c-78.4 m/s
d- 156.8 m/s
23.the ratio of output power to the input power,in percent is called
a-conductivitiy
b-efficiency
c-work
d-horsepower
24.an object with a mass of 78 kilograms is lifted through a height of 6 meters.how much work is done
a-47.75j
b-468j
c-764.4j
d.4,586.4 j
25.a car with a mass of 2,000 kilograms is moving around a circular curve at a uniform velocity of 25 meters per second.the curve has a radius os 80 meters.what is the centrietal force on the car
a-625N
b- 703 N
c-15,625 N
d-20,250 N
22.


Optional Information:
Subject: mechanics

Already Tried:
everything, even crying....this is so hard i dont have alot to pay but please help me thanx!!





Submitted: 8 years ago.
Category: Homework
Expert:  Coolchics replied 8 years ago.
If this is exam #709100, these are your answers, with a 100% coorect!
1.d
2.b
3.d
4.c
5.a
6.c
7.a
8.a
9.d
10.b
11.c
12.c
13.d
14.b
15.d
16.b
17.c
18.a
19.a
20.c
21.a
22.c
23.b
24.d
25.c
Coolchics, Teacher
Category: Homework
Satisfied Customers: 432
Experience: BA
Coolchics and 5 other Homework Specialists are ready to help you
Customer: replied 8 years ago.
oh my goooooodness girl you are the bomb i just took the test and passed thanx everybody pick her she is gooooood!!!!!!!!
Expert:  Coolchics replied 8 years ago.
THIS ANSWER IS LOCKED!
You can view this answer by clicking here to Register or Login and paying $3.
If you've already paid for this answer, simply Login.

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
< Last | 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:

 
 
 
  • Manal Elkhoshkhany

    Tutor

    Satisfied Customers:

    4520
    More than 5000 online tutoring sessions.
< Last | Next >
  • http://ww2.justanswer.com/uploads/BU/BusinessTutor/2012-2-2_115741_Kouki2.64x64.jpg Manal Elkhoshkhany's Avatar

    Manal Elkhoshkhany

    Tutor

    Satisfied Customers:

    4520
    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:

    3121
    Post Graduate Diploma in Management (MBA)
  • http://ww2.justanswer.com/uploads/ComputersGuru/2010-02-13_051118_Photo41.JPG LogicPro's Avatar

    LogicPro

    Engineer

    Satisfied Customers:

    3035
    Expert in Java C++ C C# VB Javascript Design SQL HTML
  • http://ww2.justanswer.com/uploads/lanis/2009-4-1_233717_phput9xef_c1pm.jpg Lani S.'s Avatar

    Lani S.

    Tutor

    Satisfied Customers:

    2457
    Registered Nurse, Internet Researcher, Private Tutor
  • 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:

    2341
    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:

    1975
    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:

    1873
    Bachelors Degree and CPA with Accounting work experience