3 years ago

In the elements square on the periodic table, the number with the greatest numerical value the

Physics

1 answer:

kkurt [141]3 years ago

7 0

Answer:

Osmium

Explanation:

Because Osmium has the highest numberic value

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The Doppler Effect...

<span>It describes an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away from) each other.</span>

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A jet engine pushes air at high velocity toward the rear of the plane. Thrust is created moving the plane forward. Which stateme

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3 years ago

The label has been scratched off a tuning fork and you need to know its frequency. From its size, you suspect that it is somewhe

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Answer:

255 Hz

Explanation:

The beat frequency is the difference in frequency between two frequencies that are close.

Let the the unknown frequency be $f$ .

Sounded with the 250 Hz tuning fork,

$|250-f|=5$

$f = 255 \text{ or } 245$

Sounded with the 270 Hz tuning fork,

$|270-f|=15$

$f = 255 \text{ or } 285$

The common value of $f$ in both situations is 255 Hz.

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3 years ago

Which of the following expressions is equivalent to the expression 2(x + 5)? x + 7 x + 10 2x + 5 2x + 10

bezimeni [28]

Answer:

d) 2x+10

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$2(x+5)\\=2x+10$

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4 years ago

You throw a ball straight up with an initial velocity of 15.0 m/s. It passes a tree branch on the way up at a height of 7.00 m.

Gwar [14]

Answer:

0.95 seconds

Explanation:

t = Time taken

u = Initial velocity = 15 m/s

v = Final velocity

s = Displacement

a = Acceleration = 9.81 m/s² (downward positive, upward negative)

Time taken by the ball to reach the maximum height

$v=u+at\\\Rightarrow t=\frac{v-u}{a}\\\Rightarrow t=\frac{0-15}{-9.81}\\\Rightarrow t=1.52\ s$

Maximum height

$v^2-u^2=2as\\\Rightarrow s=\frac{v^2-u^2}{2a}\\\Rightarrow s=\frac{0^2-15^2}{2\times -9.81}\\\Rightarrow s=11.47\ m$

Distance between maximum height of the ball and the branch is 11.47-7 = 4.46 m

So, the distance that will be covered on the way down is 4.46 m

Now

u = 0

s = 4.46

$s=ut+\frac{1}{2}at^2\\\Rightarrow 4.46=0\times t+\frac{1}{2}\times 9.81\times t^2\\\Rightarrow t=\sqrt{\frac{4.46\times 2}{9.81}}\\\Rightarrow t=0.95\ s$

Time taken by the ball from the maximum height to the tree branch is 0.95 seconds.

Total time taken from the moment the ball is thrown to reach the tree branch is 1.52+0.95 = 2.47 seconds

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3 years ago