Physics 13/14
if a weight scale shows that you weigh 200 kg on the surface of earth, and then you skydive with both of your feet attached to the scale, you will read a weight of....
0 kg
the curvature of earth is such that for every 8000 m tangent to the surface, the surface drops about....
10 m
escape speed from the surface of earth is about....
11.2 km/s
suppose the gravitational force between 2 spheres is 30 n. if the magnitude of each mass doubles, what is the force between the masses?
120 N
a 560 N woman stands on a top of a very tall ladder so she is one earth radius above earth's surface. how much does she weigh?
140 N
suppose the gravitational force between two massive spheres is 100 N. If the distance between the spheres is doubled, what is the force between the masses?
25 N
suppose the gravitational force between 2 masses is 70 N. if the magnitude of one of the masses halves, what is the force between the masses?
35 N
the distance to the center of the earth is:
4000 miles
suppose the gravitational force between two spheres is 70 N. if the distance between the spheres is halved, what is the force between the masses?
70 N
the orbital speed for a satellite orbiting very close to earth's surface is...
8000 m/s
a satellite near earth makes a full circle in about an hour and a half. how long would a satellite located as far away as the moon to earth orbit?
about 28 days
newton hypothesized that the moon.....
all of the above
the circular orbit of a satellite orbiting earth is characterized by a constant....
all of the above
the gravitational force between to massive spheres....
all of the above
a circle is a special case of....
an ellipse
where does a satellite in a circular orbit have the greatest kinetic energy?
anywhere - its kinetic energy is constant
where does a satellite in an elliptical orbit have the greatest kinetic energY?
at the point closest to the plant
the reason satellites orbit earth at least 150 km above the surface is to....
be above earth's atmosphere
since earth is attracted to the sun, why doesn't it fall into the sun?
because it has sufficient tangential velocity
if you stand on a weight scale in an elevator that is accelerating upwards, why do you observe an increase in your weight?
because you are accelerating upwards, there is more compression of the springs of the scale. the weight reading on the scale reflects the amount of compression of the springs.
pluto takes a longer time to travel around the sun than earth takes because pluto...
both A and B
the higher a satellite is, the...
both A and C (less its speed is, longer its period is)
a very massive object A and a less massive object B move toward each other under the influence of gravitation. which force, if either, is greater?
both forces are the same
as a satellite is moving in orbit around the earth, the sum of the kinetic energy and potential energy everywhere is.....
constant
the speed of a satellite in a circular orbit is....
constant
if earth's mass decreased to one half its original mass, with no change in radius, then your weight would....
decrease to one half your original weight
an object is placed exactly halfway between Earth and the moon. the object will fall toward....
earth
which is greater, the gravitational force between earth and the moon, or the force between earth and the sun?
earth-sun
a vertically oriented rocket that maintains a continuous upward velocity of 8 km/s will.....
escape earth
if the radius of earth decreased, with no change in mass, your weight would....
increase
if the mass of earth increased, with no change in radius, your weight would....
increase also
two objects move toward each other because of gravitational attraction. as the objects get closer and closer, the force between them....
increases
if you could throw a baseball horizontally at a speed of 8 km/s and if there were no air drag and nothing to stop it....
it would orbit earth
the Earlybird communications satellite hovers over the same point on earth's equator because....
its orbital period is 24 hours
what remains constant for a satellite in an elliptical orbit?
its total energy
jupiter has more than 300 times the mass of earth. yet on jupiter's surface an object weighs only about 3 times as much as it would on earth. the explanation to this involves jupiter's .....
large radius
a lunar month is about 28 days. if the moon were closer to earth than it is now, the lunar month would be....
less than 28 days
minimal orbital speed about earth is approximately 8 km/s. minimal orbital speed about the moon would be...
less than 8 km/s
compared to the period of a satellite in orbit close to earth, the period of a satellite in orbit far from earth is.....
longer
if you were to weigh yourself in an elevator that is accelerating upward, compared to your ordinary weight you would weigh....
more
by noticing that Uranus's orbit is perturbed and by using the law of gravitation, two astronomers independently discovered.....
neptune
the speed of a satellite in an elliptical orbit is....
not constant
there are two main processes going on in the sun that keep the sun in existence. these processes are gravitation and.....
nuclear fusion
the force of gravity on you is greatest when you are standing....
on earth's surface
consider the gravitational force between earth and a meteor in outer space. if the meteor moves so its distance from the earth's center doubles, the gravitational force on the meteor will be....
one quarter
if you stood atop a ladder on earth that was as tall as earth's radius ( so you were twice as far from earth's center) your weight atop the ladder would be...
one quarter its normal value
if the sun were to collapse to form a black hole (quite unlikely), earth would....
orbit the black hole just as it orbits the sun now
when a star collapses to form a black hole, its mass....
remains the same
a projectile is fired vertically from the surface of earth at 10 km/s. the projectile will......
rise and then fall back to earth's surface
one way that astronomers detect planets around distant stars is by observing to see if there is a _______ in the light that reaches us from a particular star. the reason that the star moves away or toward us is a __________ due to the gravitational effects of the planet.
signal, perturbation
when in orbit, a satellite such as the space shuttle is....
simply a projectile
compared to the gravitational field on the surface of earth, the gravitational field well below earth's surface is.....
smaller
if you drop a stone into a hole drilled all the way to the other side of earth, the stone will....
speed up until it gets to the center of earth
each of us weighs a tiny bit less on the ground floor of a skyscraper than we do on the top floor. one reason for this is that....
the mass of the building attracts you upward slightly
the reason the moon does not fall into earth is that...
the moon has a sufficiently large orbital speed
the fastest moving planet in a solar system is....
the planet nearest the sun
a period of a satellite is defined as....
the time for a satellite to make one complete revolution around earth
a planet has half the mass of the earth and half the radius. compared to its weight on earth, an apple on the planet would weigh....
twice as much
if you were to weigh yourself in an elevator that is in free fall, compared to your ordinary weight, you would weigh.....
zero
the gravitational field strength at the center of earth is.....
zero
