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Physics > PHY 171 - Midterm > Flashcards

PHY 171 - Midterm Flashcards

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1
Q

What are the SI units for density? What is the formula?

A

rho = m/v

SI unit = kg/m^3

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2
Q

What is 1 g/cm^3 in 1000 kg/m^3?

A

1000 kg/m^3

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3
Q

What is 1 m^3 in L?

A

1000 L

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4
Q

What formula and SI unit for pressure?

A

P = F/A

SI unit = 1 N/m^2

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5
Q

What is the nature of pressure in fluids?

A

pressure is everywhere, pushes all ways equally

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6
Q

How does pressure change with depth in a liquid?

A

pressure increases with depth

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7
Q

In a liquid, does pressure vary across a horizontal line?

A

no

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8
Q

What is the equation for guage pressure?

A

pg = p - 1 atm

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9
Q

What is the solving strategy for a connected liquid?

A

set them equal to eachother

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10
Q

What is Archimedes’ Principle?

A

a fluid produces an upward buoyant force

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11
Q

What is equal to the magnitude of the buoyant force?

A

weight of the fluid displaced or desnity of fluid * volume submerged * grav constant

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12
Q

What determines if an object floats are sinks?

A

how the buoyant force compares to its weight (depends on density)

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13
Q

What is the equation of continuity for fluid dynamics and what does it indicate?

A

v1A1 = v2A2

  • flow is faster in a narrower tube
  • flow is slower in a wider tube
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14
Q

T/F: The flow rate of a dynamic fluid is constant.

A

True, Q = vA

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15
Q

What is Bernoulli’s equation mean in terms of energy?

A

it is the conservation of energy for fluids

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16
Q

How do wider sections of a tube with a dynamic fluid affect the pressure?

A

Pressure increases in wider spaces and decreases in narrower spaces

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17
Q

In a monometer, if the right side fluid is higher than the left, is rhogh positive or negative?

A

positive

18
Q

What is oscillatory motion?

A

repetitive motion back and forth around an equilibrium position

19
Q

What is simple harmonic motion?

A

sinusoidal oscillations (ex. mass on a spring)

20
Q

What does the slope of a F vs position graph give?

A

the restoring force of a spring

21
Q

What is a phase?

A

an angle of circular motion whose shadow matches oscillator and increases with time

22
Q

If the value for the phase constant is between 0 and pi, is it positive or negative?

A

negative

23
Q

if the value of the phase constant is between pi and 2pi, is it positive or negative?

A

positive

24
Q

Where does an oscillating object have purely PE and purely KE?

A

purely PE at x = +/- A

purely KE at x = 0 (equilibrium)

25
Q

Do period and frequency depend on amplitude for simple harmonic motion?

A

no

26
Q

What is the equation for the restoring force of a pendulum?

A

F = -mgsin(theta)

27
Q

What do the frequency and period of a pendulum depend on and not depend on?

A

depend on length of pendulum

does not depend on mass

28
Q

What quantity must a physical (torsional) pendulum incorporate?

A

moment of inertia (I)

29
Q

What are damped oscillations?

A

oscillations that slow down and stops due to external force

30
Q

How does the envelope of damped oscillations decay?

A

exponentially

31
Q

REMINDER:

A

fill in damped, lightly, heavily here!!

32
Q

What is a driven oscillatin?

A

oscillator subjected to periodic external force

33
Q

What is resonance?

A

large-amplitude response to driving force due to driving force frequency matching that of system (fext = fo)

34
Q

What does a lightly damped peak with resonance look like on a resonance curve?

A

tall and skinny

35
Q

What is a traveling wave?

A

organized disturbance traveling with well defined speed

36
Q

What is a transverse wave?

A

wave in which displacement is perpendicular to direction of travel (ex. electromagnetic)

37
Q

What is a longitudinal wave?

A

displacement is parallel to direction of travel

38
Q

Do mechanical waves require a medium?

A

yes

39
Q

How is wave speed increased ?

A

increasing tension or decreasing string density

40
Q

What does a snapshot graph show and what are its axes?

A 
x = position
y = displacement

shows wave pulse (actual picture)

41
Q

What does a history graph show and what are its axes?

A 
x = time
y = displacement

shows history of a particular point in medium (leading edge is closes to y-axis)

Physics (2 decks)

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