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pantera1 [17]
3 years ago
6

A light-year is:

Physics
1 answer:
Elina [12.6K]3 years ago
4 0
A is the answer for this question
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Help Help Help pls...
alexandr1967 [171]

Answer:

1 is B 2 is D 3 is C

Explanation:

3 0
3 years ago
If oxygen and steel wool are combined is it a physical change or chemical change?
Anon25 [30]

Answer:

I think it would be a chemical change.

Explanation:

Because a physical would be like crushing it or something along that line.

4 0
3 years ago
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Alan leaves Los Angeles at 8:00 a.m. to drive to San Francisco, 400 mi away. He travels at a steady 45.0 mph . Beth leaves Los A
WARRIOR [948]

Answer:

a.Beth

b.2232 s

Explanation:

We are given that

Distance,d=400 mi

Speed of Alan,v=45 mph

Speed of Beth,v'=55 mph

a.Time =\frac{distance}{speed}

Using the formula

Time taken by Alan=\frac{400}{45}=8.89 hr

Time taken by Beth=\frac{400}{55}=7.27hr

Alan will reach San Francisco at 4:53 PM

Beth will reach San Francisco at 4:16 PM

Beth will reach before Alan.

b.Difference between time=8.89-7.27=1.62 hr

t=1.62 hr

1.62-1=0.62 hr

0.62 hr=0.62\times 60\times 60=2232 s

Hence, Beth has to wait 2232 s for Alan to arrive .

6 0
3 years ago
How do physicists use measurements to understand the natural world?? Use scientific language to describe your evidence.
34kurt

Answer:

Measurements are used to describe quantitatively real-life situations

Explanation:

Measurement refers to the act of assigning a number (with a unit) to a characteristic of an object or an event.

For example: when we want to measure the size of an object, we can use a rule to measure its length, and we assign a number with a unit for that quantity (for example, 5 cm). In this case, we have done a measurement.

Measurements are used by scientists in order to understand the natural worlds. In fact, without measurements it would be impossible to describe phenomena of the real world quantitatively: it would be only possible to describe them qualitatively, and therefore it would not be possible for instance to derive mathematical laws that describe those phenomena.

5 0
3 years ago
What is the period of a 1.4-m pendulum?
Feliz [49]

Answer:(A)

Explanation: ...

4 0
2 years ago
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