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VikaD [51]
3 years ago
11

The brightness of a star is determined

Physics
2 answers:
ad-work [718]3 years ago
8 0
The answer would be B
nasty-shy [4]3 years ago
4 0
100% C . By size and distance
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Practicing soccer skills works most muscles groups.<br><br> True Or False
defon

Answer:

True

Explanation:

4 0
2 years ago
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A wave has a period of 2 seconds and a wavelength of 4 meters.Calculate its frequency and speed.
Lana71 [14]
F=l/t
f=4/2
f=2m/s

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3 years ago
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Why does the frequency of a wave increase as the wavelength decreases
olchik [2.2K]

Explanation:

We know that the number of complete waves formed in 1 sec time is frequency and the distance between two consecutive crests or troughs is wavelength. And we have the formula that

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or, frequency = velocity / wavelength

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3 years ago
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A person throws a baseball from height of 7 feet with an initial vertical velocity of 50 feet per second. Use the vertical motio
Gnoma [55]

Answer:

3.25 seconds

Explanation:

It is given that,

A person throws a baseball from height of 7 feet with an initial vertical velocity of 50 feet per second. The equation for his motion is as follows :

h=-16t^2+vt+s

Where

s is the height in feet

For the given condition, the equation becomes:

h=-16t^2+50t+7

When it hits the ground, h = 0

i.e.

-16t^2+50t+7=0

It is a quadratic equation, we find the value of t,

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Neglecting negative value

Hence, for 3.25 seconds the baseball is in the air before it hits the ground.

6 0
3 years ago
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