Physics Midterm

Front 1

Universal standard

Back 1

that all measurements follow the same rules of notation.

Front 2

velocity

Back 2

the rate at which an object changes its position in three dimensional space

Front 3

Diffusion

Back 3

the movement of molecules within a solution so that the solution becomes thoroughly saturated with the particles that are being diffused

Front 4

Temperature

Back 4

the movement of kinetic energy in an object or solution

Front 5

Which of the following most accurately describes a third class lever?

Back 5

A force is applied to a rigid bar between the fulcrum and the load to be moved

Front 6

What is the physical mechanism by which sufrace tension takes places

Back 6

electrostatic forces pull molecules closer together along the surface of liquids

Front 7

Using a star Trek Tricorder from the future, you measure the average velocity of molecules in two samples of liquid. In sample one, the average velocity is 550 mi/hr, in Sample two, the average velocity is 400m/sec. With this information, what can you determine about the 2 samples

Back 7

sample two has a higher temperature than sample one

Front 8

Piezo electricity is a phenomenon which

Back 8

produces electric current under compression forces

Front 9

Which of the following describes the role of surface tension in the lungs

Back 9

surface tension will pull water molecules closer together which decreases the size of the alveoli and slows the rate of diffusion

Front 10

The ratio of the density of a substance to the density of water is called its

Back 10

specific gravity

Front 11

Of the four, known fundamental forces in the univers, which is primarily responsible for the most phenomena in the human body?

Back 11

electromagnetism

Front 12

A physics concept which describes the rate at which an object changes its position in three dimensional space is known as

Back 12

velocity

Front 13

SMaller diameter blood vessels will have a ---------resistance to blood flow than large vessels

Back 13

higher

Front 14

Fluid flow is affected by several different factors. For each item listed below, fill in the blank to indicate whether it will increase, decrease, or have no effect on fluid flow

Back 14

decrease in pressure=decrease, lower surface tension=no efffect, increased cross sectional area=increase, decreased viscosity=increase, increased length=decreased

Front 15

WHich of the following methods of heat transfer is the primary method of transferring heat away from the body when you sit on a block of ice

Back 15

conduction

Front 16

which of the following methods of heat transfer can be affected by a change in the humidity of the air

Back 16

evaporation

Front 17

which of the following is a valid statement concerning levers in the human body

Back 17

the most common type of lever in the human body is the second class lever

Front 18

the inhalation of air into the lungs occurs because

Back 18

the diaphragm contracts which increases the volume of the thoracic cavity, which lowers the pressure inside the chest cavity below the atmospheric pressure

Front 19

which of the following is the best description of the process by which heat transfer take place in conduction?

Back 19

thermal energy imparts kinetic energy to the neighboring electrons and so on, which causes the thermal energy to move through the solid matierial

Front 20

which of the following statements is true about blood pressure in the human body?

Back 20

pascal's principal dictates that when the heart contracts, all the arterial blood is very nearly at the same pressure

Front 21

The blood pressure in the systemic arteries is higher than the blood pressure in the pulmonary arteries primarily due to which physical parameter

Back 21

diameter of the vessels?? Check

Front 22

viscosity of the blood will have what effect on the blood pressure

Back 22

increasing the viscosity will increase the blood pressure

Front 23

the combined gas law is used to describe changes to a volume of gas at different times and conditions. WHich of the following is not correct about the combined gas law

Back 23

increasing the pressure of a system will cause no effect on its temperature

Front 24

the production of heat in the human body is best described by which of the following

Back 24

fat free mass

Front 25

the following chart refers to last weeks homework

Back 25

gas/liquid/temp/energy chart

Front 26

consider a mixture of gas and liquid at standard atmospheric pressure. The internal energy content of the substance is altered until the system consists of a mixture of liquid and solid. Which of the following describes the steps the substance goes through, in order, based upon the regions shown in the above figure?

Back 26

DCB

Front 27

What phase or phases of matter are present in portion B of the above curve

Back 27

solid and liquid

Front 28

What is the name given to region 4 of the above curve

Back 28

heat of vaporization

Front 29

what is the name given to point 1 of the above curve

Back 29

melting point

Front 30

you are late to class and driving from dontown LA to santa monica, a distance of about 14 miles. You arrive at class after 40 minutes. What was you average velocity on this trip.

Back 30

help

Front 31

in the figure at right, how much force, in newtons must be exerted by the biceps muscle to keep the ball from dropping

Back 31

help

Front 32

briefly explain why evaporation takes place even if a bowl of water and its surroundings are the all at the same temperature

Back 32

evaporation takes place because of a variety of moleculal velocities within the liquid. The velocity of the molecule wil be such that it will break free from the liquid. this will drive the temo of the liquid down. However different velocities of molecules continues and will also break free until all the liquid is gone

Front 33

in the torques example at the right is this a 1st, 2nd or 3rd class lever system

Back 33

2nd class lever

Front 34

find the length of the beam

Back 34

.42 m

Front 35

Biophysics

Back 35

the application of physics to biology such as studying the joints in lever systems

Front 36

viscosity

Back 36

viscosity reflects the ability of a fluid to flow different materials (water, plasma) each have their own viscosity ratio, the more viscous the slower the flow

Front 37

Torque

Back 37

the application of force not through the center of gravity. Torque will change the state of rotation in an object (??)

Front 38

surface tension

Back 38

The cohesive forces between liquid molecules are responsible for the phenomenon

Front 39

convection

Back 39

transfer of heat between fluids

Front 40

a force whose primary effect is to change the state of rotation of an object or system is known as

Back 40

torque

Front 41

which of the following most accurately describes a second class lever

Back 41

a force that is applied to a rigid bar such that the load to be moved is between the force and the fulcrum

Front 42

which of the 4 heat transfer methods contributes the LEAST to normal regulation of the temperature of the human body

Back 42

conduction??

Front 43

WHich of the following is na accurate definition of heat

Back 43

the transfer of energy between 2 objects at different temperatures

Front 44

A 130 lb acupuncture student measures her body fat and finds it 28%. If she does no exercise and simply lies on the couch all day pretending to study, but she compensates by eating a healthy, fairly low calorie diet (only 1400 cal./day), will she be able to lose weight or will shee turn into a fat blimp?

Back 44

have we talked about this??

Front 45

which of the following describes the role of surface tension in the lungs

Back 45

surface tension will pull water molecules closer together, which decreases the size of the alveoli and slows the rate of diffusion

Front 46

the ratio of the density of a substance to the density of water is called its

Back 46

specific gravity

Front 47

larger diameter blood vessels will have a -----resistance to blood flow than small vessels

Back 47

lower

Front 48

which of the following is an accurate staement about pressure

Back 48

pressure is directly related to the applied force, and inversely related to area

Front 49

temperature is primarily a measure of which physical parameter

Back 49

kinetic energy

Front 50

The radius of the tube at the right is .05 cm. If the fluid being pumped through it is liquid glycerine, what will be the resulting flow rate, the pressure difference between the two ends is 20mm Hg

Back 50

Q=3r 4squared (P1-P2)/nl we should talk about this one

Front 51

Which methods of heat transfer take place in the following scenario. Draw pictures to justify your answer an acupuncture student sits on a block of ice wearing only a bathing suit, on a beach on a sunny windy day.

Back 51

sitting on the ice some heat will be lost through conduction. Assuming that the temperature outside is less than the temp. of the persons body, heat will be lost through evaporation sweat will form on the person's body, and the wind will make it evaporate wuicker. ALso, given its cool out, some heat will be lost through radiation, however at a warmer temp the radiation from the sun may slow down the heat loss or may even add heat such as sitting in the sun will make it warmer

Front 52

WHich statement is most correct about the ability of a person to conserve heat in cold weather

Back 52

a short heavy person with short limbs and small ears is better able to conserve body heat than a skinng person with long thin legs and arms with big ears