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Concept Physics Chapter 10 - Projectile Motion & Orbits Flashcards | StudBud
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Concept Physics Chapter 10 - Projectile Motion & Orbits
Concept Physics Chapter 10 - Projectile Motion & Orbits
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1
Minimal orbit speed about Earth is about 8 km/s. Minimal orbital speed about Jupiter is
more than 8 km/s.
less than 8 km/s.
about 8 km/s.
2
According to Kepler, the line from the Sun to any planet sweeps out equal areas of space
with each complete revolution.
in equal time intervals.
only when the paths are ellipses.
if it has a constant velocity.
3
A projectile is fired at 300 m/s from a 20 m tall tower. How far downrange will it hit the ground?
200 m.
600 m.
300 m.
400 m.
4
According to Kepler, the paths of planets about the Sun are
circles.
straight lines.
parabolas.
ellipses.
5
Which of these vary for satellites in
circular
orbits?
none of these.
kinetic energy.
momentum.
speed.
6
To drop a package to Earth from a satellite pointed in the direction it's moving, launch it
behind the satellite at the satellite's speed.
ahead of the satellite at the satellite's speed.
none of these.
straight downward.
7
A rock thrown straight up reaches the top of its path and falls a distance, its acceleration is (neglect air resistance)
less than at the top of its path.
greater than at the top of its path.
the same as at the top of its path.
8
It takes Neptune a longer time to orbit the Sun than Earth does because Neptune
goes much slower.
has much further to go.
both of these
Neptune doesn't take longer than the Earth to orbit the sun.
9
As soon as a bowling ball rolls off the edge of a table its
horizontal
component of velocity
remains constant.
becomes zero.
increases.
decreases.
10
The kinetic energy of a planet is maximum when it is
closest to the Sun.
farthest from the Sun.
least accelerating.
none of these.
11
Minimal orbital speed about Earth is about 8 km/s. Minimal orbital speed about the Moon is
about 8 km/s.
more than 8 km/s.
less than 8 km/s.
12
A projectile is launched upward at 50 m/s. If air resistance is negligible, its speed when it returns to its start is
more than 50 m/s
50 m/s
less than 50 m/s
13
Consider a ball released at rest at the edge of the solar system. If it drops to Earth only because of Earth's gravity
It will strike Earth's surface with a speed of about 11.2 km/s.
It will strike Earth's surface at the speed of light.
It will strike Earth's surface with a speed of about 9.8 km/s.
It will strike Earth's surface with a speed of about 8 km/s.
14
As soon as a ball rolls off the edge of a table
has a zero net force acting on it.
it is not acted on by any horizontal forces.
none of these
it is not acted on by any vertical forces.
15
Newton
hypothesized that the forces acting on planets was
perpendicular to their directions of travel.
none of the above
along their directions of travel.
toward the Sun.
16
The conservation of energy applies to satellites in
neither of these.
circular orbits.
both of these.
elliptical orbits.
17
An Earth satellite is simply a projectile
freely falling around Earth.
approaching Earth from outer space.
floating motionless in space near Earth.
18
A lunar month is about 28 days. If the Moon were
closer
to Earth than it is now, the lunar month would be
more than 28 days.
about 28 days.
less than 28 days.
need more information
19
What prevents satellites such as the ISS from falling?
the absence of air drag
centrifugal force
nothing
centripetal force
20
A satellite coasting at constant speed in a
circular
orbit
undergoes changes in its potential energy.
none of these.
is beyond the pull of Earth's gravity.
is nevertheless accelerating.
21
A projectile that is fired
vertically
from the surface of Earth at 5 km/s will
go into circular orbit around Earth.
none of these.
go into an elliptical orbit around Earth.
rise and fall back to Earth's surface.
22
A ball rolls off a table at the same time another ball drops vertically from the same table. The first ball to land is
the dropped ball.
both hit at the same time.
the rolling ball.
23
Ideally, a ball is thrown up at an angle and lands downrange. Because of air resistance, the distance reached is
less.
need more information
the same.
greater.
24
To escape Earth's orbit
using the least fuel
, a rocket in an
elliptical
orbit should fire it's thrusters at
either the apogee or the perigee.
any location in the orbit.
the perigee, where it is closest and fastest.
the apogee, where it is farthest and slowest.
25
A projectile is fired at 100 m/s from a tower. How far downrange will it be after 1 second?
98 m
100 m
50 m
490 m
26
The force of gravity does work on a satellite when it is in a
circular orbit.
neither of these.
both of these.
elliptical orbit.
27
A lunar month is about 28 days. If the Moon were
farther
from Earth than it is now, the lunar month would be
more than 28 days.
less than 28 days.
need more information
about 28 days.
28
According to Kepler, the square of the orbital period of a planet is directly proportional to the
planet's average distance from the Sun.
planet's maximum distance from the Sun.
cube of the planet's average distance from the Sun.
square of the planet's average distance from the Sun.
29
When a rock is thrown upward at 50 degrees, neglecting air drag, its horizontal component of velocity
remains unchanged.
increases.
decreases.
30
If a satellite's
radial
velocity is zero at all times, its orbit must be
elliptical.
circular.
parabolic.
geosynchronous.
31
The orbital path of a satellite has two focal points. When both focal points are the same point
the satellite path is an ellipse.
the satellites lose speed.
the satellite path is a circle.
32
Which of these vary for satellites in
elliptical
orbits?
all of these.
speed.
momentum.
kinetic energy.
33
Hang time is the time your feet are off the ground in a jump. If you jump inside a moving car, your hang time will be
slightly more.
the same.
slightly less.
34
From Earth, one satellite appears to overtake another. The faster satellite is
can't say
lower.
smaller.
higher.
35
The speeds of the planets about the Sun
depends
on
none of the above
their distances from the Sun.
their periods of rotation.
the masses of the planets.
36
When air drag affects the motion of projectiles, they don't travel
neither of these
as far.
both of these
as high.
37
An Earth satellite in an
elliptical
orbit has its smallest speed
when getting farther from Earth.
need more information
when farthest from Earth.
closest to Earth.
38
A weightless astronaut in an orbiting satellite is
none of the above
beyond the pull of gravity.
shielded from Earth's gravitational field.
like the satellite, pulled by Earth's gravitation.
39
The foci of a satellite in an elliptical orbit around the Sun are
outside the Sun.
both of these.
inside the Sun.
neither of these.
40
Planets would crash into the Sun if it weren't for
their tangential velocities.
the fact that they are beyond the main gravitation of the Sun.
the inverse-square law.
their relatively small masses.
41
Who envisioned the motion of planets as projectiles obeying the laws of physics?
Newton
none of these
Kepler
Brahe
42
The fastest moving planet in a solar system is the
all move at the same speed.
smallest planet.
planet farthest from the Sun.
planet nearest the Sun.
43
Our Moon in Earth orbit travels fastest when it is
involved in an eclipse.
closest.
rotating.
revolving.
44
An Earth satellite in an
elliptical
orbit travels fastest when it is
farthest from Earth.
nearest Earth.
everywhere along its orbit.
none of these.
45
An object freely falls to the ground with acceleration
g
. If it is thrown up at an angle instead, neglecting air drag
the acceleration along its path will be more than g.
the acceleration along its path will be less than g.
the acceleration along its path will be zero.
the acceleration along its path will be the same.
46
A projectile that is fired
vertically
from the surface of Earth at 8 km/s will
follow an uncertain path.
go into circular orbit about Earth.
rise and fall back to Earth's surface.
escape from Earth.
47
The
tangential
velocity of an Earth satellite is its velocity
parallel to the surface of Earth.
attributed to satellites moving in any direction.
perpendicular to the surface of Earth.
48
Acceleration is greater for a satellite when it is at the
apogee (farthest point).
perigee (closest point).
same acceleration at all of the above places.
zenith.
49
If you throw a ball horizontally from the top of a cliff, after
one second
its vertical distance has dropped by
10 m.
5 m.
15 m.
9.8 m.
50
The
radial
velocity of an Earth satellite is its velocity
none of these
perpendicular to the surface of Earth.
parallel to the surface of Earth.
attributed to satellites moving in any direction.
