Astro 150 - Week 9

Given this figure, the gravitational force that asteroid A exerts on B = ____ , and the gravitational force D exerts on C = ____ .

[HINT: gravity = (mass#1 x mass#2) / (distance)^2]

• 12, 9

• 4, 4

• 6, 9

• 12, 36

Tags

NGSS.MS-PS2-4

NGSS.MS-PS2-5

The strength of Earth’s gravity on the spaceship when it is at position T is __ times ____ than Earth’s gravity on the spaceship at position R.

[HINT: gravity = (mass#1 x mass#2) / (distance)^2]

• 3, stronger

• 9, stronger

• 3, weaker

• 9, weaker

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Earth is much more massive than the Moon. If the Enterprise is parked at different positions (A-C), at which position is the acceleration from net forces greatest?

• At position A

• At position B

• At position C

• Same at all positions

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-1

NGSS.MS-PS2-4

NGSS.MS-PS2-5

Gravity = (m1 * m2) / d^2

Can this be applied to find the force between the Earth and you? If so, what is the distance in the equation?

• No

• Yes, d is the diameter of the Earth.

• Yes, d is the distance from you to the ground.

• Yes, d is the distance from you to the center of the Earth.

On the Moon,

• your weight is the same and you have less mass.

• you weigh less and your mass is the same.

• you weigh more and your mass is the same.

• you weigh more and you have less mass.

What is responsible for Earth's meteor showers?

• Debris from the Moon is occasionally blown into the Earth's atmosphere by solar winds.

• Chunks of rock separate from a comet as it orbits the sun, and those chunks of rock enter the atmosphere when Earth crosses the comet's orbit.

• Small meteors from the asteroid belt are occasionally drawn into Earth's orbit.

• Meteor showers are a myth.

According to NASA's estimates, what is the total weight of the meteors that hit the Earth every day?

• Less than 1 pound

• 100 pounds

• 10 tons

• 100 tons

Chunks of rock and ice rain down on Earth from outer space. _______ burn up in the atmosphere, while _______ actually hit the ground.

• meteors, asteroids

• meteorites, meteors

• comets, asteroids

• meteors, meteorites

NASA finds that 20-30 fireballs occur in Earth’s atmosphere each year. According to the graph, the objects responsible for these events must be

• less than 1 foot in size

• about 1 meter in size

• 10 to 100 meters in size

• over 100 meters in size

Tags

NGSS.MS-ESS3-2

The 55 foot wide meteor that exploded above Chelyabinsk in Russia was captured on video by a lot of Russian dashcams. Why do so many Russians have dashcams?

• Russians are required by law to record their windshields while they drive.

• Driving livestreams are incredibly popular in Russia.

• They frequently sue each over car accidents.

• They record their windshield in the hopes of recording a meteor exploding in the atmosphere.