 The nearest galaxy to our own is called. - Essay Prowess
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# The nearest galaxy to our own is called.

Question 1

The nearest galaxy to our own is called “Andromeda.” It is approximately 250 000 “light years” away. This means that it would take light travelling at a speed of 3.0 x 108 m/s about 250 000 years to get from Andromeda to Earth. How far away, in kilometres, is the Andromeda galaxy?

2.1 x 1018 km
2.4 x 1017 km
24.1 x 1018 km
2.4 x 1018 km

Question 2
A subway train decelerates from 25.0 m/s [E] to a stop in 10.0 s. What is the train’s acceleration?

-2.5 m/s2 [W]
-2.5 m/s2 [E]
2.5 m/s2 [N]
2.0 m/s2 [E]

Note: The train is moving in an easterly direction, and is slowing down. This means that the acceleration is directed toward the west. This might make it seem like the first choice is the correct answer. However, the negative sign also indicates direction, so an acceleration of -2.5 m/s^2 WEST is actually an  acceleration in the EAST direction. Similarly, an acceleration of -2.5 m/s^2 EAST is an acceleration in the WEST direction.

Since we want an acceleration that is directed WEST, choice B is the correct choice.

All that being said, that may or may not be what your instructor wants, depending on what has been taught in your course.

Question 3
A speeding SUV passed an unmarked police cruiser parked at the side of a straight and deserted highway. The SUV was travelling at a constant speed of 35.0 m/s and the cruiser immediately pursued it with a constant average acceleration of 5.0 m/s2. How far along the highway did the police cruiser catch the speeding SUV?

About 49 km down the highway from the point where the SUV initially passed     the police cruiser.

About 400 m down the highway from the point where the SUV initially passed     the police cruiser.

About 490 m down the highway from the point where the SUV initially

passed  the police cruiser.

About 90 m down the highway from the point where the SUV initially passed the             police cruiser.

Question 4
A skier slid down a very icy hill with an acceleration of 2.3 m/s2 for 18.0 s. If she started from rest, how far did she travel?

389 m
373 m
456 m
0 m

Question 5
An object’s displacement with respect to some reference point can change even though its distance from that point remains constant.

True
False

Note: An object moving in a circular path of constant radius relative to a reference point would have a constantly changing displacement vector, while the actual distance from the reference point remained constant.

Question 6
A certain line segment on a position-time graph has a run of 3.0 h and a rise of 300 km [E]. The average velocity during this interval is:

100 km/h [E]
0.10 km/h [E]
0.01 km/h [E]
100 km/h [W]

Question 7
Donald begins a journey 5 km east of his home. He later arrives at Daisy’s house that is 12 km west of his home. His displacement for this trip is:

7 km [W]
13 km [E]
17 km [E]
17 km [W]

Question 8
The slope of the line on a velocity-time graph represents the _________ over that time interval.

displacement
average velocity
instantaneous acceleration
average acceleration

Question 9

The slope of a line joining any two points on a position-time graph represents:

the total distance travelled between those two points
the average acceleration in that interval of time
the average velocity between those two points
the average speed between those two points

Question 10
The kinematic equations of motion on page 38 of your notes only apply for:

objects that travel in a straight line only
objects that maintain a constant speed and velocity
uniformly accelerated motion along a straight line
non-uniformly accelerated motion along a straight line

Note: Without knowing exactly what is shown on that particular page of your notes, it is impossible for me to be certain, but I suspect that the answer indicated above is what your instructor is looking for.

Question 11
A constant positive acceleration indicates that the final velocity is ______ the initial velocity.

less than (more negative than)
greater than (more positive than)
equal to
opposite in direction to

Question 12
An athlete runs around a circular track of radius 64.0 m and returns to her starting point in precisely one minute. The magnitude of her average velocity for this trip is:

6.7 m/s
0 m/s
4.3 m/s
6.4 m/s

Question 13
A race car with an initial velocity of 16 m/s [W] accelerates uniformly covering 120 m in 3.0 s. The magnitude of its acceleration is:

3.0 m/s2
5.3 m/s2
9.0 m/s2
16.0 m/s2

Question 14

A school bus travelled 12 km [N 45ø E] and then 5 km [S 45ø E]. The total displacement for this trip is:

7 km [S 45ø E]
17 km [E 22ø N]
13 km [N 68ø E]
8 km [E]

Question 15

A realistic video game has a tank flying upwards, over a cliff, and falling back to ground level in 9.2 seconds. How high is the cliff?

39 m
119 m
89 m
104 m

Question 16
Julian putts a golf ball up a steep hill. If the golf ball is initially traveling at 20m/s [N] and experiences an acceleration of 5.0m/s2 [S], what is the displacement of the golf ball 6s later?

30m [N]
15m [S]
2.5m [N]
-20m [N]