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3 years ago

Q: Why are distances in space often measured in light years?

Physics

2 answers:

marin [14]3 years ago

6 0

Answer:

the answer is b

Explanation:

Hope it helps :)

nadezda [96]3 years ago

3 0

B) Distances in space are so great that a large unit is needed

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A rock is dropped from the top of a vertical cliff and takes 3.00 s to reach the ground below the cliff, A second rock is thrown

Tcecarenko [31]

Answer:

12.25m/s

Explanation:

$d=v_ot+\dfrac{1}{2}at^2$

Since the initial velocity of the dropped rock is 0, you can write this as:

$d=\dfrac{1}{2}(9.8)(3)^2=44.1m$

Now, you can set up the equation for the thrown rock:

$44.1=v_o(2)+\dfrac{1}{2}(9.8)(2)^2 \\\\\\44.1=2v_o+19.6 \\\\\\2v_o=24.5 \\\\\\v_o=12.25m/s$

Hope this helps!

3 0

3 years ago

Vesna Vulovic survived the longest fall on record without a parachute when her plane exploded and she fell 5 miles, 733 yards. W

Valentin [98]

Answer:

8717 meters.

Explanation:

We need to know the conversion factors. We know that:

1 mile = 1609.34 meters

1 yard = 0.9144 meters

This means that:

$\frac{1609.34 meters}{1 mile}=1$

$\frac{0.9144 meters}{1 yard}=1$

It is convenient to leave the units we want at the end in the numerator so the ones in the denominator cancel out with the ones we want to remove, as will be seen in the next step.

We will convert first the miles, then the yards, and add them up.

$5miles=5miles\frac{1609.34 meters}{1 mile}=8046.7meters$

$733yards=733yards\frac{0.9144 meters}{1 yard}=670.2552meters$

So total distance is the sum of these, 8717 meters.

8 0

3 years ago

A passenger on a stopped bus notices that rain is falling vertically just outside the window. When the bus moves with constant v

nekit [7.7K]

Answer:

1)0.325

2) $6.17\ \rm m/s$

Explanation:

Given:

The angle that falling raindrops make with the vertical= $18^\circ$

Let $V_R$ be the velocity of the raindrops and $V_B$ be the velocity of the bus.

$\dfrac{V_R}{V_B}=\tan 18^\circ\\\dfrac{V_R}{V_B}=0.315\\$

2)Speed of the raindrops $=0.315\times 19$

$=6.17\ \rm m/s$

5 0

3 years ago

A student is considering doing a complete repeated measures design experiment involving motor skills. The student's advisor has

Lelu [443]

Answer:

c. ABBA counterbalancing 

Explanation:

The student should not use the method because it is a progressive error management technique for each subject by introducing all treatment circumstances twice, first in one sequence, then in the other (AB, BA) by subject counterbalancing.

If participants experience conditions more than once, they experience the conditions first in one order, then the opposite order.

3 0

3 years ago

Use the slit example to explain why you can hear a noise in another room through an open door.

defon

Because the wall reflects sound waves to your ears bouncing off of the walls, even if it's in another room.

8 0

3 years ago