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Semester 2 Exam Review Flashcards | StudBud
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Semester 2 Exam Review
Semester 2 Exam Review
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1
Why does “heat rise”?
Gravity pulls the warmer air down/pushes the colder air up
Gravity pulls thecolder air down/pushes the warmer air upw
2nd law ofthermodynamics
Because Ms. Carlin saysso
2
In an inelasticcollision, some KE isn'tconverted to the other object. Where does the energy go?
It is lost as thermal energy
It is lost as sound energy
It is lost as electricity
turns into potential energy
3
An elevator lifts 1.1 x 10
3
kg 40 m in 12.5 s. How much power does the elevator generate?
3.4 x 104 J
1.15 x 103 W
3.4 x 104 W
1.15 x 104 W
4
In an elastic collision, momentum is conserved, as is
Kinetic energy
Potential energy
Velocity
Speed
5
Which of following is the best example of work being done an object?
Pushing on a car thatwill not move
Keeping a board inplace
Holding a 50 kg barbell
Lifting a bag ofgroceries
6
For a wire that obeys Ohm’s law, the resistance of a wire depends on the _______ the wire.
Current in
Voltage across
Length of
Power delivered by
7
A student exerts 23.3 N of force and 47.2 J of work on a box. How far does the box move?
1,099.8 m
2.03 m
0.49 m
23.9 m
8
At this temperature,molecules have fallen into their lowest energy state.
0 K
0°F
0° B
0° C
9
The main differencebetween fission and fusion is that
Fusion= divide nucleus;fission= combine masses, form nucleus
Fission= add a nucleus; fusion = remove mass to form nucleus
Fission = remove mass to form nucleus; fusion= add a nucleus
Fission= divide nucleus;fusion= combine masses, form nucleus
10
The force exerted by a person on a machine is called
Resistance force
Propulsive force
Effort force
Machine force
11
Most matter in the universe is in what state of matter?
Gas
Plasma
Liquid
Solid
12
As matter accelerates its speed approaching the speed of light, what happens
the mass of a moving object measures less
time moves quicker
time moves slower
the laws of physics deteriorate
13
When the speed of an object doubles, its kinetic energy
Is halved
Doubles
Quadruples
Is squared
14
Kinetic energy, work,and potential energy all:
Are affected by time
Involve an objectmoving
Are measured in joules
Can be measured byforce times distance
15
A 2-cm thick cardboard would be
most
effective in protecting against which type of radiation?
gamma
alpha
beta
x-ray
16
Which of these is a switch?
C
B
A
D
17
What is the equation for mechanical energy of a closed system?
E = KE + PE
E + KE = PE
KE = E + PE
KE = PE
18
Why does a humid day feel warmer than a dry day at the same temperature?
Cold air is less dense
Archimedes' principle
Thermal Expansion of gas
Because hot air has to turn up
19
Which most directly affects an athlete’s power when performing timed trials of climbing stairs?
Height climbed, timespent climbing, body weight
Body weight, time spentclimbing, width of steps
Body weight, heightclimbed, width of steps
Height climbed, timespent climbing, width of steps
20
The relationship of two systems in thermal equilibrium can be described as:
The densities areequal.
The volumes are equal.
The masses are equal.
No net energy isexchanged.
21
High temperature is connected to:
High Potential Energy
Low Potential Energy
Low Kinetic Energy
High Kinetic Energy
22
The energy transferred to or from a system as heat and by work is equivalent to:
Entropy Change
Temperature Change
Specific Heat
Internal Energy Change
23
The meniscus of water in a graduated cylinder is a result of _________________.
Cohesive forces
Buoyant forces
Adhesive forces
Evaporation
24
Which of these is the most viscous?
Fondue
Acetone (Nail polishremover)
Water
Motor oil
25
The law of conservation of energy states that in a closed, isolated system, energy can be:
Neither created nordestroyed
Destroyed, but notcreated.
Created, but notdestroyed
Created and destroyed
26
Which of these is NOT amethod of detecting radiation?
Substances that areionized by radiation
Substances thatfluoresce in response to radiation
Observing a fluorescenteffect
Photographic plates
27
The kilowatt-hour is a unit of
Energy
Potential
Power
Current
28
The equation for gravitational potential energy is PE = mgh. What is h?
The distance that theobject is from the reference level
Total enthalpy of asystem
The height of theobject
The elastic constant ofthe object
29
Which of these bestdescribes the Standard Model?
protons, neutrons, electrons = thebuilding blocks of matter
Radaway and Stimpacks = buildingblocks of matter
matter and antimatter = buildingblocks of matter
quarks, leptons, force carriers =building blocks of matter
30
An inventor claims to have designed a device that creates its own power. Why it can't it work?
Law of conservation of matter
Newton’s 3rdlaw
Newton’s 2ndlaw
Law of conservation of energy
31
#10 Method of heat transfer
Convection
Radiation
Equilibrium
Conduction
32
Albert Einstein said that __________ is energy.
Effort
Mass
Resistance
Gravity
33
#12 Method of heat transfer
Radiation
Convection
Equilibrium
Conduction
34
#11 Method of heat transfer
Radiation
Conduction
Convection
Equilibrium
