Physic's Exam- Multiple Choice

Front 1

Displacement is best defined as..

Back 1

the change in distance over time

Front 2

velocity is best defined as...

Back 2

the rate of change of displacement

Front 3

acceleration is best defined as

Back 3

the rate of change of velocity

Front 4

translation is best defined as

Back 4

motion without rotation

Front 5

the center of mass is best defined as

Back 5

the point where all the mass in a body can be concentrated

Front 6

the principle of inertia is best explained by

Back 6

constant motion does not require a force

Front 7

scalar is to vector as::

Back 7

speed is to velocity

Front 8

the approximate number of seconds in a year is

Back 8

10^8

Front 9

a rate is best defined as

Back 9

a comparison to time

Front 10

if you double the height of a person, then

Back 10

surface area doubles, bone strength doubles, weight doubles

Front 11

the solar wind is best defined as

Back 11

a stream of charged particles emitted from the sun

Front 12

plasma is best defined as

Back 12

the answer said none of these, so go find out

Front 13

the cause of a magnetic field is best explained by

Back 13

the movement of electric charges

Front 14

the process that powers the sun is

Back 14

fusion

Front 15

the chemical composition of a star can be determined by

Back 15

spectroscopy

Front 16

the temperature of the surface of a star can be determined by its

Back 16

color

Front 17

terrestrial is to gas giant as ::

Back 17

mars is to neptune

Front 18

planetary day is to planetary year as ::

Back 18

rotation is to revolution

Front 19

albedo is best defined as

Back 19

the percentage of light reflected from a planet

Front 20

asteroid is to comet as ::

Back 20

rock is to ice

Front 21

all of the following are necessary to create an aurora except (a magnetic field, the solar wind, ionized gas, sunlight, none of these)

Back 21

sunlight

Front 22

the best explanation for why a comet becomes visible as it approaches the sun is (it is large and shiny, ice vaporizes to gas which is set on fire by the solar wind, ice vaporizes to gas which is ionized by the solar wind, it gets hot and the hydrogen starts to burn in the air in space, it gets hot and the hydrogen starts to fuse because of the sun's gravity)

Back 22

ice vaporizes to gas which is ionized by the solar wind

Front 23

the planet that owuld float in water is..

Back 23

saturn

Front 24

the hottest planet is

Back 24

venus

Front 25

the surfaces of cloud-covered planets and moons have been mapped by using

Back 25

microwave light

Front 26

nucleosynthesis is best explained as

Back 26

the production of heavier elements from lighter ones

Front 27

plasma is best defined in physics as

Back 27

a mixture of atomic nuclei and electrons that are not bound to each other, radio-active matter, and a high temperature ionized gas

Front 28

the way a star achieves hydrostatic equilibrium is best explained by

Back 28

the forces of gravity and fusion being balanced

Front 29

the process that powers the stars is

Back 29

fusion

Front 30

the chemical composition of a star can be determined by

Back 30

spectroscopy

Front 31

the temperature of the core of a star can be determined by (the mass of the star, the color of the star, or the age of the star)

Back 31

The color of the star

Front 32

white dwarf is to small star as ::

Back 32

red dwarf is to white dwarf (but i don't know if this is right or not...?)

Front 33

planetary nebula is to small star as ::

Back 33

super nova is to large star

Front 34

isotopes are best defined as

Back 34

elements with the same atomic number but different numbers of neutrons

Front 35

hydrogen is to helium as ::

Back 35

helium is to carbon

Front 36

all of the following are conducive to life existing in a star system except: (a chemically enriched planetary environment, a stable energy output from the star, a planet with a medium mass, a star that emits primarily microwave EM radiation, none of these)

Back 36

a planet with a medium mass

Front 37

the best explanation for why the core of a star collapses is

Back 37

the fusion reactions in the core stop and gravity compresses it

Front 38

the star with the hottest surface is what spectral type?

Back 38

O

Front 39

the reaction that requires the hottest temperature is (hydrogen to helium, helium to carbon, carbon to iron, carbon to uranium, unable to determine without more info.)

Back 39

carbon to uranium

Front 40

if the surgace temperature of a star doubles, the energy output of the star

Back 40

increases by a factor of 16

Front 41

barycenter is best defined as

Back 41

the center of mass of a multiple star system

Front 42

the 2 factors that determine the luminosity of a star are

Back 42

color and mass

Front 43

when an electron in an atom jumps from a higher energy level to a lower one, the atom

Back 43

emits light

Front 44

the best example of an ideal blackbody is

Back 44

a cavity

Front 45

displacement is best defined as

Back 45

the change in distance over time

Front 46

velocity is best defined as

Back 46

the rate of change of displacement

Front 47

acceleration is best defined as

Back 47

the rate of change of velocity

Front 48

a projectile is best defined as

Back 48

a body that is freely-falling

Front 49

all of the following are projectiles except (a ball thrown upward, a bullet fired downward, an arrow fired horizontally, the moon, a jet plane)

Back 49

a jet plane

Front 50

the principle of inertia is best explained by

Back 50

constant motion does not require a force

Front 51

scalar is to vector as ::

Back 51

time is to force

Front 52

vectors are added tip to tail; the resultant is drawn

Back 52

tail-to-tail with the first vector

Front 53

a vector can always be written as the sum of the two

Back 53

perpendicular components

Front 54

the best explanation for why a ball shot horizontally with a large speed will take the same time to fall as a ball released from rest at the same height is

Back 54

gravity has no horizontal effects

Front 55

potential energy is best defined as

Back 55

energy due to position or configuration in realation to a force

Front 56

heat is best defined as

Back 56

energy transferred by conduction due to differences in temperature

Front 57

temperature is best defined as

Back 57

a measure of kinetic energy

Front 58

work is best defined as

Back 58

the vector dot product of a force and a desplacemnt

Front 59

all of the following are examples of positive work except (the work done by you while lifitng a book to a height of 1 meter, pushing a desk across the floor, compressing a spring, accelerating a baseball from rest to 90 mph, lowering a book a height of 1 meter)

Back 59

the work done by you while lowering a book a height of 1 meter

Front 60

the principle of conservation is best explained by

Back 60

the total amount remains conctant in a closed system

Front 61

scalar is to vector as ::

Back 61

work is to force

Front 62

two vectors are perpendicular if

Back 62

the dot product of the two vectors is zero

Front 63

a force does no work if

Back 63

the force is perpendicular to the displacement

Front 64

all of the following incolve negative potential energy excpe t(the energy of a proton in a the atomic nucleus, of an electron in an atom, of a person standing on the earth, of two magnets that are attracting eachother, of two magnets that are repelling each other

Back 64

the energy of two magnets that are attracting each other

Front 65

linear momentum is best defined as

Back 65

the intensity of translational motion

Front 66

impulse is best defined as

Back 66

force times time

Front 67

center of mass is best defined as

Back 67

the point where all the mass can be imagined to be concentrated

Front 68

the velocity of the center of mass remains constant in all of the following except (the net force acting on the sustem is zero, the net impulse on the sustem is zero, the acceleration of the system is constant, the net force acting on the system is constant)

Back 68

the net force acting on the system is constant

Front 69

all of the following must occur due to an impulse acting on a rigid body excpept (the momentum of the body changes, the kinetic evergy of the body changes, the velocity of the body changes, the potential energy of the body changes, none of these)

Back 69

none of these

Front 70

all of the following are logical consequences of the conservation of momentum except (the velocity of the center of mass of two colliding carts remains constant, the acceleration of the center of mass of two colliding carts remains constant, newton's first law, newton's second law, newton's third law)

Back 70

the acceleration of the center of mass of two colliding carts remains constant

Front 71

scalar is to vector as ::

Back 71

work is to impulse

Front 72

when a cart collides elasticallyw ith a spring, all of the following occur except (the momentum of the cart is conserved, the kinetic energy of the cart is transformed into potential energy in the spring, an impulase is applied to the cart by the spring, an impulse is applied to the spring by the cart, the cart rebounds with the same speed that it hit the spring)

Back 72

the cart rebounds with the same speed that it hit the spring

Front 73

the defining characteristic of an elastic collision is

Back 73

the kinetic energy of the system is conserved

Front 74

which of the following conditions for an inelastic collision between a fast moving projectile and a stationary target will result in the maximum transtormation of kinetic energy? (The projectile and the target have the same mass, the projectile is much more massive then the target, the projectile is much less massive than the target, it doesn't matter; all of the energy is transformed, none of these)

Back 74

the projectile is much more massive then the target

Front 75

center of gravity is best defined as

Back 75

the point where all the weight can be imagined to be concentrated

Front 76

center of pressure is best defined as

Back 76

the point where all the aerodynamic forces can be imagined to be concentrated

Front 77

a model rocket is stable when

Back 77

the center of pressure is behind the center of gravity

Front 78

the engine code F 50-6 means:

Back 78

the impulse is F class, the average thrust is 50 N and there is a 6 s delay

Front 79

a fin fillet is

Back 79

glue added to the fin- body seam to increase strength

Front 80

all of the following are necessary to make a sage launch except (the thrust to lift off weight ratio is 5 to 1, the engine uses an elevtrical ignition system, an altimeter for dual deployment, a parachute or other recovery mechanism, a well- constructed model that has no structural damage)

Back 80

an altimeter for dual deployment

Front 81

the third law interaction that explains how a rocket is propelled is

Back 81

the rocket motor pushes on the fuel and the fuel pushes on the rocket motor

Front 82

the engine core geometry that will give the greatest lift off thrust is

Back 82

the star core

Front 83

the main purpose of the launch lug is to

Back 83

allow the rocket to slide along the launch rod until it is moving fast enough for stable flight

Front 84

which of the following choices of engine and parachute will allow you to have the greatest chance of recovering your very small light rocket safely and undamaged on a breezy day? (a small engine and no recovery device, a small engine and a small parachute, a large engine and a small parachute, a large engine and a large parachute, a huge engine and a huge parachute)

Back 84

a small engine and a small parachute