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