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