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Intro to Physics > Chapter 3 > Flashcards

Chapter 3 Flashcards

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1
Q

At high velocities, most of the fuel used in an automobile is used to over

a. gravity
b. momentum
c. air resistance
d. buoyancy

A

c. air resistance

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2
Q

Balloons rise until

a. the surrounding air becomes too dense
b. the surrounding air becomes too thin (not dense)
c. the surrounding air becomes too cold
d. they reach space

A

b. the surrounding air becomes too thin (not dense)

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3
Q

At an altitude of 200 km, the downward force of gravity on an earth satellite is

a. the same as on the surface of the earth
b. a little bit weaker
c. zero
d. about half as strong as on the surace

A

b. a little bit weaker

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4
Q

Airplanes fly (maintain their altitude) by

a. pushing fuel downward
b. pushing fuel backward
c. pushing fuel upward
d. pushing air downward

A

d. pushing air downward

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5
Q

Rockets fly by

a. using antigravity
b. pushing air downward
c. pushing fuel downward
d. being lighter than air

A

c. pushing fuel downward

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6
Q

The storm surge in the hurricane comes from

a. the strong waves
b. increased gravity
c. the force of winds on buildings
d. the low pressure

A

d. the low pressure

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7
Q

When an astronaut in space sneezes, his head is snapped back with higher velocity than on earth, because

a. momentum is conserved
b. his head is massless
c. there is no air in space
d. Wrong! his head is not snapped back wither higher velocity.

A

d. Wrong! his head is not snapped back wither higher velocity.

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8
Q

A rail gun

a. accelerates rails
b. can shoot bullets faster than ordinary guns
c. doesnt really accelerate things
d. uses ions for propulsion

A

b. can shoot bullets faster than ordinary guns

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9
Q

The sun would be a black hole if it were squeezed into a radius of

a. 2 miles
b. 2,000 miles
c. 2 million miles
d. it already is a black hole

A

a. 2 miles

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10
Q

The method that would take the least energy to get something to space is

a. lifting it by elevator ( if existed)
b. using an ion rocket
c. flying it in a balloon
d. launching it in a three stage rocket

A

a. lifting it by elevator ( if existed)

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11
Q

If an artificial satellite orbited the earth at 240,000 miles ( the distance to the moon), it would orbit the earth in a period of

a. 90 minutes
b. 1 day
c. 1 week
d. 1 month

A

d. 1 month

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12
Q

The time it takes a geosynchronous satellite to orbit the earth is

a. 90 minutes
b. 1 day
c. 1 week
d. 1 month

A

b. 1 day

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13
Q

The force of gravity between two people standing next to each other is

a. zero
b. too small to measure
c. small but measurable
d. greater than 1 lb

A

c. small but measurable

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14
Q

You can see where the tropopause is by

a. looking at earth satellites
b. seeing how high birds fly
c. looking at the tops of thunderstorms
d. seeing where lightning comes from

A

c. looking at the tops of thunderstorms

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15
Q

If satellites fly too low, they will crash because

a. of stronger gravity
b. of weaker gravity
c. of lower air density
d. of air resistance

A

d. of air resistance

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16
Q

Ice-skaters spin faster by pulling in their arms. This illustrates that

a. momentum is conserved
b. angular momentum is conserved
c. energy is conserved
d. angular energy is conserved

A

b. angular momentum is conserved

17
Q

Someone firing a rifle is pushed back by the rifle. This illustrates that

a. momentum is conserved
b. angular momentum is conserved
c. energy is conserved
d. angular energy is conserved

A

a. momentum is conserved

18
Q

A problem with rail guns is that

a. they use too much energy to be practical
b. they violate momentum conservation
c. the high accelerations can cause damage
d. they are limited to about the speed of sound

A

c. the high accelerations can cause damage

19
Q

The maximum acceleration of the space shuttle is about

a. 1 g
b. 3 g’s
c. 10 g’s
d. 18 g’s

A

b. 3 g’s

20
Q

The lowest practical altitude for a satellite orbiting the earth is about

a. 10 km
b. 200 km
c 600 miles
d 24,000 miles

A

b. 200 km

21
Q

For very high velocities, the best kind of rocket to use is

a. ion rocket
b. hot air rocket
c. hydrogen/oxygen
d. tnt

A

a. ion rocket

22
Q

The altitude of a geosynchronous satellite is closet to

a. 200 miles
b. 22k miles
c 2 million miles
d. 93 million miles

A

b. 22k miles

23
Q

Skyhook, if built is

a. a way of getting to very high orbits
b. away to get into space using less energy
c. a safer way to get into space
d. a faster way to get into space

A

b. away to get into space using less energy

24
Q

If you fall for one second, your speed will be approximately

a. 8 mph
b 22 mph
c. 32 mph
d. 45 mph

A

b 22 mph

25
Q

Artificial gravity can be created in a spaceship by

a. accelerating the ship
b. moving at high velocity
c. using ion engines
d. there is no such thing.

A

a. accelerating the ship

26
Q

Orbital velocity is about

a. 5 miles per sec
b. 7 miles per sec
c. 8 miles per sec
d. 11 miles per sec

A

a. 5 miles per sec

27
Q

The sun is mostly hydrogen, yet the earth has very little hydrogen gas thats because

a. it escaped to space
b. it combined with oxygen to make water
c. it combined with carbon to make hydrocarbons
d. it was burned by fusion when the early earth was hot

A

a. it escaped to space

28
Q

The orbit of GPS is

a. LEO
b. MEO
c. GEO (same as HEO)
d. TEO

A

b. MEO

29
Q

A geosynchronous satellite orbits the earth

a. once every 90 minutes
b. once every 6 hours
c. once every 24 hours
d. once every month

A

c. once every 24 hours

30
Q

A typical spy satellite can continuously observe a location on the ground for about

a. 10 seconds
b. one minute
c. 90 minutes
d. 12 hours

A

b. one minute

31
Q

Compared to the weight of they payload, the fuel used in a rocket to orbit typically weighs

a. about the same
b. less than half as much
c. about twice as much
d. over 20 times more

A

d. over 20 times more

32
Q

A cubic meter balloon can lift

a. about one gram
b. about 2 pounds
c. about 50 pounds
d. about 150 pounds

A

b. about 2 pounds

33
Q

Spy satellites usually fly at

a. LEO
b. MEO
c. HEO
d. Escape velocity

A

a. LEO

Intro to Physics (7 decks)

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