physics quiz lesson I wish I knew
Angular momentum is conserved for a satellite in
both of these
If a satellite's radial velocity is zero at all times, its orbit must be
circular
our moon travels the fastest as it orbits the earth when it is
closest
The force of gravity does work n a satellite when it is in
elliptical orbit
a vertically oriented rocket that is somehow able to maintain a continuous upward velocity of 8 km/s will
escape from the earth
An Earth satellite is simply a projectile
freely falling around the earth
consider a moon that orbits one of our most distant planets in an elliptical path. The distance that the moon covers each day is
greatest when the moon is closest to the planet
It takes Pluto a longer time to orbit the sun than the Earth does because Pluto
has much farther to go and is much slower
A woman on the surface of the earth has a mass of 50 kilograms and a weight of 490 newtons. If the woman were floating freely inside a space habitat far away from the earth, she would have
less weight and the same mass
A "weightless" astronaut in an orbiting shuttle is
like the shuttle, pulled by Earth's gravitation
Compared to the period of satellites in orbit close to the Earth, the period of satellites in orbit far from the Earth is
longer
From Earth, one satellite appears to overtake another. The faster satellite is
lower
a lunar month is about 28 days. if the moon were farther from the earth than it is now, the lunar month would be
more than 28 days
Minimal orbit speed about Earth is approximately 8 km/s. Minimal orbital speed about jupitarwould be
more than 8 km/s
a satellite describes an elliptical orbit about a planet. The satellite travels much faster when it is directly over a: -large ocean -large island -high mountain range -great plain or plateu
none of the above choices affects its speed very much
the period of a satellite, the time it takes for a complete revolution, depends on the satellite's
radial distance
A projectile is fired vertically from the surface of the Earth at 8 km/s. The projectile will
rise and fall back to the Earth's surface
a projectile is fired vertically from the surface of the earth at 5 km/s. the projectile will
rise and fall back to the earth's surface
Angular momentum is greater for a satellite when it is at the
same at apogee and perigee
Acceleration due to gravity on the moon is less than on Earth, and the moon is smaller than Earth. So compared to an Earth satellite, a satellite in a close orbit about the moon would travel
slower
Which would require the greater change in a satellite's orbital speed (30 km/s); slowing down so the Earth crashes into the sun, or speeding up so the Earth escapes the sun?
slowing down
The fastest moving planet in a solar system is
the planet nearest the sun
the speeds of the planets about the sun depend on
their distances from the sun
Planets would crash into the sun if it weren't for
their tangential velocities
Consider a monkey wrench released at rest at the far edge of the solar system. Suppose that it drops to Earth by virtue of only Earth gravity. It will strike Earth's surface with a speed of about
11.2 km/s
An airplane that flies at 100 km/h in a 100 km/h hurricane crosswind has a ground speed of
141 km/h
Which of the following is not a vector quantity?
Speed
An Earth satellite is in an elliptical orbit. The satellite travels fastest when it is
nearest the earth
A satellites near the Earth makes a full circle in about an hour and a half. How long would a satellites located as far away as the moon take to orbit the Earth?
about 28 days
Earth satellites are typically more than 100 km high so as to be above the Earth's
atmosphere
Pioneer 10 was able to escape the solar system by
"bouncing off" Jupiter like a tennis ball bouncing off an approaching tennis racket.
According to Kepler's laws, the paths of the planets about the sun are
Ellipses
Rockets that launch satellites into orbit need less thrust when fired from
Hawaii
What prevents satellites such as the space shuttle from falling?
Nothing; they are continually falling as they orbit the Earth
The Early Bird communication satellite hovers over the same point on Earth's equator indefinitely. This is because
its orbital period is 24 hours
a lunar month is about 28 days. if the moon were closer to the earth than it is now, the lunar month would be
less than 28 days
Minimal orbital speed about the Earth is about 8km/s. Minimal orbit speed about the moon would be
less than 8 km/s
a satellite in an elliptical orbit travels at constant -velocity -speed -acceleration -all of these -none of these
none of these
A river 100m wide flows due south 1 m/s. A boat goes 1 m/s relative to the water leaves the west bank. To land at a point due east of its starting point, the boat must be pointed
nowhere-- it cant be done
Communications and weather satellites always appear at the same place in the sky. This is because these satellites are
orbiting the Earth with a 24-hour period
The tangential velocity of an Earth satellite is its velocity
parallel to the surface of the earth
Acceleration s greater for a satellite when it is at the
perigee
A rocket coasts in an elliptical orbit about the Earth. To attain escape velocity using the least amount of fuel in a brief time, should it fire off at the apogee, or at the perigee? (Hint: Let "Fd= change in KE" guide your thinking.)
perigee, where it is closest and fastest
The radial velocity of an Earth satellite is its velocity
perpendicular to the surface of the Earth
In circular motion the acceleration vector is...
ponied towards the center of the circle
The circular path of a satellite orbiting the Earth is characterized by a constant
speed, acceleration, and radial distance
Which would require the greater energy; slowing down of the orbital speed of the Earth so it crashes into the sun, or speeding up the orbital speed of the Earth so it escapes the sun?
speeding up
In circular motion the velocity vector is...
tangent to the circle edge
