Ascout on a hike becomes lost. he does not have a compass, but he does have a small needle, a magnet, and some water. he magnetizes the needle and then gently places it on the surface of the water, where it points to the north. what property of the water makes it possible for the needle to lie on the surface of the water? a. viscosity b. definite volume c. surface tension d. boiling point
Solved
Show answers
More tips
- A Art and Culture How to Learn to Play Guitar?...
- S Style and Beauty What to Do When Hair Starts Falling Out?...
- H Health and Medicine Novomin: What is it and how to use it?...
- P Philosophy Unbelievable stories of encounters with otherworldly forces...
- L Leisure and Entertainment How to Choose the Perfect Gift for Men on February 23rd?...
- H Health and Medicine How to Treat Whooping Cough in Children?...
- H Health and Medicine Simple Ways to Lower Cholesterol in the Blood: Tips and Tricks...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
- L Leisure and Entertainment History of International Women s Day: When Did the Celebration of March 8th Begin?...
- S Style and Beauty Intimate Haircut: The Reasons, Popularity, and Risks...
Answers on questions: Biology
- B Biology Justify using the culture without FGF5 as the control in the experiment represented Figure 4...
- B Biology Does fitness(as used in biology) and survival have the same meaning...
- B Biology Where do you find prokaryotic cells?...
- B Biology Which explains the outer gas planets when the solar system formed? a. the rotation of the young solar system repelled gases outward by centripetal acceleration. b. the...
- B Biology Which term specifically describes the categorization of people into ethnic groups without taking into account individual differences?...
- B Biology Where does the energy within the greenhouse effect originate from convection within the atmosphere from the circular movement of hot and cold air from solar radiation...
- B Biology Find the amount of work done in emptying a cylindrical tank completely filled with kerosene. assume that the radius of the cylindrical tank is 3 m, height is 6 m, and...
- B Biology Atype of reproduction that can be done with one parent...
- B Biology What are the reactants in the equation for cellular respiration?...
- B Biology Which of these word parts is a root that means pertaining to the “brain ? ОА. cerebr/o OB. cyst/o OC. appendic/o OD. rhin/o...
Ответ:
C.surface tension
Explanation:
Surface tension refers to the property of water or any liquid to enhance its surface area by a certain amount. It is a very important property of water due to which it resists any external force due to cohesive nature of water molecules.
How surface tension help needle to float on water:
It is a property of water which enhance the attractive force between needle and liquid.
The molecules on the surface of water do not have any force acting from upwards because that side is exposed to atmosphere. This causes a downward force but no upward force on upper surface,so the molecule of surface tend to stay together by forming a thin sheet or imaginary layer.
If weight of any material cannot break surface tension it will float on water surface. This is what happens with needle.Therefore, when needle is placed on water surface with alot of care in horizontal direction, it will not break surface tension and hence will float on water. Please see attached image for better understanding.
Hope it clears up the picture!
Ответ:
Yes.
Explanation:
If the water is shallow, sound waves will reflect off the bottom of the ocean and will return faster than in deep sea. But in deeper water, the sound waves will take longer to travel to the bottom and return. Ships and submarines also use sonar to navigate at sea.