MEDI11002 Physics For Health Sciences


Question:


Part 1

This glossary lists all keywords you used in your Part 2 answers.

In your glossary, each keyword should be identified.

Include all symbols or units of measure related to the keyword.

Once you have defined a keyword, you can use the term in your Part 2 responses.

If you used equations to answer Part 2, please include them in your glossary.

Part 21.

Please indicate whether or not the statement is true. Also, explain your reasoning.a.

When a medical supply trolley is rolled around a curve, its velocity & acceleration remain the same.b.

To act as a tourniquet, an elastic band is placed around the patient’s arm. There is no work involved and no stored energy.2.

A student healthcare professional has been asked by the school to lift a box weighing 12 kg onto a shelf. This shelf is at a height of 0.3 m above ground and 5.5 meters from where the box was stored.

The student is holding onto the box and moving at a steady 0.15 m/s.

As the student approaches a shelf, he sees another student opening the door.

Will the student be able to stop in 2.s?

(Let’s assume that the student applies the same amount of force every time).3.

While waiting for your lecture, you purchase a single serve soft drink in standard plastic bottles with screw-on lids.

The lid is opened to let you enjoy a glass of water. Fluid seeps out from the bottom.

To return the bottle as defective, you place the lid back onto the bottle.

You can stop the flow of liquid from the hole by putting the lid back on.

i. Distinguish between the properties in the soft drink and the plastic containerii.

Explain why flow was not initiated until the lid was removed.

Answer to Question: MEDI11002 Physics For Health Sciences

Part 1

Velocity: The distance traveled per unit amount of time.

Acceleration-rate change in velocity per unit amount

Work – A task that is performed using your mental or physical capacity

Force – interaction that when unopposed changes the motion a body’s body

Adhesion: Attraction between identical molecules or particlesCohesion- attraction between different molecules

Atmosphericpressure- Pressure that results from atmospheric weight

Part 21a.

False. Because velocity and acceleration depend on direction of movement (which is changing in this instance), they can change.b.

True, work is not done if the distance covered is zero.

There is no work if there isn’t a distance movement.

However, the band is capable of storing energy that is released when it is stretched.2.

Mass = 12kg

Height =0.3m

Distance = 5.55 m

Speed = 0.15m/s

Box was moved using force

F = ma

Here is the time it takes to move 5.5m at 0.15 sec.

T =d/s

= 5.5/0.15 = 38.667 second

The acceleration is speed / time= 0.15/ 36. 667 = 0.00409 m/s2

Force = mass + acceleration

= 12×0.00409 = 0.49 N

You will need to wait until you spot the opening at 1 m.

Because the force and the mass are constants, the student needs the same acceleration to stop the door from opening.

Force = 0.049N

Acceleration = (f /) m =0.049/12 = (0.00409/s2)

The student’s velocity to avoid knocking at the door = 1/2 = 0.55 m/s

Time taken to stop transporting the box = velocity/acceleration

= t=v/a

time = Velocity/acceleration= 0.5/ 0.00409 m/s2

= 122.25 Sec

This means that collisions will not occur for more than 2 seconds.3i.

The cohesive forces of the plastic and soft drinks are different and have different types molecule.

This means that the drink will not attract the plastic molecules and can flow out of the bottle when it has the chance (Field trip videos and AIMS MEDIA). (1992).

Furthermore, the differences in molecule types are able to increase the flow of the soft drink.

The attraction of the same molecules between molecules is able increase the detachment whenever a bottle is opened.

Liquid particles are enclosed packed and solid particles are tightly locked.

Also, liquid particles can slide and jiggle against each other, which creates flow. But solid particles are locked in place and are not allowed to move.ii.

The lid can be opened and more pressure is exerted on the liquid’s top, which causes the liquid to flow out of its container.

The atmospheric pressure can be used to increase the pressure of the liquid, thereby causing the flow to stop (Rodgers, Evans, & Leigh Marine Laboratory,83).

The atmospheric pressure, which is constant, creates a pressure difference between the top of the bottles and the bottom of the bottles. This pressure can cause the soft drink to stop flowing.

The drink creates its own pressure, so the atmospheric pressure can increase it.

When the bottle has been closed, the pressure at bottom equals the pressure at top (Rodgers, Evans, & Leigh Marine Laboratory, 1985).

This means that the soft drinks won’t flow out unless there is an additional pressure.

Refer to

Field trip videos, inc., AIMS MEDIA. (1992).

Temperature and humidity.

CharyFieldh in Calif: AIMS Media.

Rodgers, D. W., Evans J. H., & Leigh Marine Laboratory. (1983).

Atmospheric Pressure Leigh, N. Z.

University of Auckland Marine Laboratory. .


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