Oil flows upward in the wick of a lantern because of the liquid property called?

Question

A: viscosity
B: capillarity
C: meniscusity
D: density

Answer 1

B. Capillarity

"Capillarity causes the part of the surface of a liquid in contact with a solid, to be either elevated above (e.g. water), or depressed below (e.g. mercury), the rest of the surface. This trait is named for the behaviour of liquids in capillary tubes placed perpendicular to the surface. The forces operating within capillarity are cohesion, adhesion, and surface tension.

Capillary action helps us in our daily lives. For example, it makes water rise through the fibres of a kitchen towel. If capillary action did not exist, we would not be able to blot up spills on a table, or ink from a page."

"Expert: Spaceman
Date: 3/9/2006
Subject: mechanics

Question
Dear Spaceman,

I have a son who is in high school who needs some help in mechanics,and I'm really not good in this area. Please help!

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 to a height of 4 meters. What is the pressure at any point at the bottom of the tank? (You can ignore atmospheric pressure when calculating your answer.)

A. 4.0 kPa
B. 9.8 kPa
C. 18.9 kPa
D. 39.2 kPa


4. The ability of a material to transfer heat or electric current is called

A. insulation.
B. porosity.
C. conductivity.
D. convection.


5. A steel block has a volume of 0.08 m³ and a density of 7,840 kg/m³. What is the force of gravity acting on the block (the weight) in water?

A. 5,362.56 N
B. 6,150.64 N
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. 1.3.
D. 2.5.


7. If an object has a mass of 20 kg, what is the force of gravity 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 vessel containing mercury, the surface of the mercury inside the tube will be
A. lower than the mercury in the vessel, and shaped like the outside of an umbrella.
B. higher than the mercury in the vessel, and shaped like the outside of an umbrella.
C. lower than the mercury in the vessel, and shaped like the inside of a bowl.
D. higher than the mercury in the vessel, and shaped like the inside of a bowl.


9. How much time should be allowed for a 605-mile car trip if the car will be traveling at 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 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine?

A. 92 percent
B. 94 percent
C. 96 percent
D. 97 percent


11. What is the kinetic energy of an object that has a mass of 30 kilograms and moves with a velocity 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 pressure of 156 kPa, its absolute pressure is approximately

A. 56 kPa.
B. 100 kPa
C. 256 kPa.
D. 300 kPa.

13. According to Ptolemy's model of the movement of celestial bodies,

A. the earth rotates around the sun.
B. the sun is the center of the universe.
C. the earth rotates around the moon.
D. planets orbit in circular paths around the earth.


14. A car with a mass of 1,200 kilograms is moving around 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 of the curve?

A. 160 meters
B. 80 meters
C. 32 meters
D. 16 meters


15. What force is required to accelerate a body with a mass of 15 kilograms at a rate of 8 m/s²?

A. 1.875 kg
B. 23 kg
C. 23 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.


17. A car travels from Boston to Hartford 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
B. 36 km/hour
C. 60 km/hour
D. 960 km/hour


18. Which of the following is the term used to describe a body's resistance to a change in motion?

A. Inertia
B. Acceleration
C. Gravity
D. Mass


19. If the velocity of an object 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 input power, in percent, is called

A. conductivity.
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. 47.75 J
B. 468 J
C. 764.4 J
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 of 80 meters. What is the centripetal force on the car?

A. 625 N
B. 703 N
C. 15,625 N
D. 20,250 N



Thanks for your help,
the answers he has are 1.b 2.c 3.b 4.a 5.a 6.d 7.b 8.c 9.a 10.d 11.a 12.d 13.d 14.a 15.c 16.b 17.d 18.a 19.d 20.d 21.c 22.a 23.b 24.c 25.c


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Answer
Hello Bud:

I normally do not do homework questions, but I noticed a few errors with your sons answers.

Here are some corrections, the remaining answers can stay the same.

Some Corrections:
1. D
4. C
9. D
21. A
----------------------

For this kind of help in the future, please be sure to vist the website:
http://www.physicsforums.com/ "

Answer 2

If the oil is heated then it is because of a liquid property called density. The less dense liquid flows up...(if it is heated thou!)

Answer 3

Capillarity?

Answer 4

B: Capillarity

Thanks for this question b/c I myself did not know this till I put the word in Yahoo search and got in return the definition and all kinds of examples to understand the meaning. My suggestion is that you put this in the search tool bar and it would be easy to get the answer.

Answer 5

The answer is density

Answer 6

D:density

Answer 7

B. cappillarity

Answer 8

i thnk capillarity

Answer 9

capillarity