Physics

Question 1

Newton’s 1st Law of motion (law of inertia)

Answer 1

-object at rest or in a state of motion will tend to remain in that state unless acted upon by a net force

Question 2

Newton’s 2nd law of motion

Answer 2

• when a net force acts on object, the change in object’s state of motion will be inversely proportional to mass of object and directly proportional to net force acting on object
• F=ma

Question 3

Newton’s 3rd law of motion

Answer 3

for every action, there exists an equal and opposite reaction

Question 4

(T/F) Surface area is directionally proportional to air resistance

Answer 4

true

Question 5

When an object is floating (masses/volumes) are equal. When an object is fully submerged, (masses/volumes) are equal.

Answer 5

• float=mass

- submerged=volume

Question 6

Venturi effect

Answer 6

reduction in fluid pressure when fluid flows through a constricted section

Question 7

cohesive forces

Answer 7

IMF responsible for surface tension

Question 8

adhesive forces

Answer 8

forces between molecules of tube and fluid molecules

Question 9

Cohesive forces form (concave/convex) surfaces and adhesive forces form (concave/convex) surfaces

Answer 9

cohesive-convex

adhesive-concave

Question 10

Which direction to electrons and current flow?

Answer 10

electrons-anode to cathode

current-cathode to anode

Question 11

inertia

Answer 11

resistance to motion

Question 12

Poiseuille’s Law

Answer 12

• Flow = ΔPπr4 / 8Lη

- flow rate is directly proportional to radius to the fourth power

Question 13

What affect do surface area and temperature have on surface tension?

Answer 13

they both cause surface tension to decrease

Question 14

positron emission (beta positive decay)

Answer 14

proton converted into neutron while emitting a positron

Question 15

beta minus decay

Answer 15

convert neutron into proton while emitting an electron

Question 16

(T/F) conductivity and resistivity are inverse of each other

Answer 16

true

Question 17

myopia vs hyperopia

Answer 17

• myopia- diverging lens

- hyperopia-converging lens

Question 18

Archimedes principle

Answer 18

buoyant force on an object submerged in a fluid is equal to the weight of the fluid that is displaced by that object

Question 19

wavelength of visible light range

Answer 19

between about 400 to 750 nm (red is highest and violet is lowest: ROYGBIV)

Question 20

mechanical work by elastic force equation

Answer 20

W= Fx/2

Question 21

equation for power

Answer 21

P= W/t
P= Fv
P=IV

Question 22

How does an atom become radioactive?

Answer 22

remove/add neutron to the nucleus

Question 23

fundamental frequency equation for string fixed at both ends

Answer 23

f = v/(2L)

Question 24

Convex lens always has (positive/negative) focal length and Concave lens always has (positive/negative) focal length.

Answer 24

Convex-positive

Concave-negative

Question 25

(T/F) Temperature and resistance are directly related

Answer 25

true

Question 26

virtual, reduced, and upright images are what type of lense?

Answer 26

divergent (always negative focal length)

Question 27

total internal reflection

Answer 27

When light ray begins at higher-index material and reaches a boundary with a lower-index one

Question 28

torque

Answer 28

force that causes objects to turn or rotate; farther the force is applied from the axis of rotation, the greater the angular acceleration

Question 29

If bouyant force > objects weight

Answer 29

the object will rise to the surface and float

Question 30

Poiseuille’s law for resistance

Answer 30

- R = 8ηl/πr4 - flow rate directly proportional to vessel radius and pressure difference - flow rate inversely proportional to viscosity and vessel radius

Question 31

Speed (increases/decreases) when cross-sectional area decreases

Answer 31

increases

Question 32

ideal gas

Answer 32

high temperature and low pressure

Question 33

(T/F) Continuity equation indicates that velocity is inversely proportional to the square of the diameter

Answer 33

True

Question 34

(T/F) Electric field lines originate on positive charges and terminate on negative charges

Answer 34

True

Question 35

Terminal voltage

Answer 35

V = E – Ir

Question 36

conductor

Answer 36

Free electrons in the conductor arrange themselves on the surface so that the electric field they produce inside the conductor exactly cancels any external electric field

Question 37

(T/F) Electric force F acts parallel to the electric field E.

Answer 37

True

Question 38

Right hand rule

Answer 38

The thumb points in the direction of the motion of charge, while the fingers follow the magnetic field lines. The palm faces the direction of the magnetic force.

Question 39

concave mirror

Answer 39

converging real, inverted image in front of the mirror

Question 40

convex mirror

Answer 40

diverging virtual, upright image behind the mirror

Question 41

effect of dielectrics

Answer 41

reduce electric field- voltage decrease and capacitance increase

Question 42

capacitance relation to area and distance

Answer 42

directly proportional to area and inversely to distance

Question 43

resistors in series have constant (voltage/current) and resistors in parallel have constant (voltage/current)

Answer 43

series-current | parallel-voltage

Question 44

Frequency shift (+/-) when source velocity is negative and then positive

Answer 44

``` negative velocity (moving towards)= + frequency shift positive velocity (moving away)= - frequency shift ```

Question 45

state functions vs process function

Answer 45

state-describe equilibrium state of a system | process-describes path taken by system to go from one equilibrium state to another

Question 46

thermal conductivity

Answer 46

- higher thermal conductivity (heat transfer more rapid) | - ex: higher for a tile than carpet

Question 47

Destructive interference occurs at which phase degree?

Answer 47

180

Question 48

direction magnetic force acts on a moving charge

Answer 48

perpendicular to both the velocity of the charge and the direction of the magnetic field