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3 years ago

HELP ASAP PLEASE Which of the following mechanical waves have the same energy?

Physics

2 answers:

serious [3.7K]3 years ago

6 0

Answer:

1 and 4 is the answer

UNO [17]3 years ago

6 0

Answer:

1 and 4

Explanation:

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30. The length of mercury thread when it is at 0°C, 100°C and at an unknown temperature 0 is 25mm, 225mm and 175mm respectively.

yulyashka [42]

Answer:

75°C

Explanation:

175−25/225−25=x−0/100−0

150/200=x/100

x=150×100/200

= 75°C

3 0

2 years ago

What percentage of the takeoff velocity did the plane gain when it reached the midpoint of the runway? a plane accelerates from

ElenaW [278]

When is at the end of the runway the velocity of the plane is given by the equation $vf^{2}=0+2*a*s$ where s=1800 m is the runway length. Thus
$vf^{2}=2*5*1800=18000 (m/s)^{2}$
$vf =134.164 (m/s)$

At half runway the velocity of the plane is
$v^{2}=2*5* \frac{1800}{2}=9000 ( \frac{m}{s} )^{2}
$
$v= \sqrt{9000}=94.87 ( \frac{m}{s})$

Therefore at midpoint of runway the percentage of takeoff velocity is
‰ $P= \frac{v}{vf}= \frac{94.87}{134.164}=0.707$

6 0

2 years ago

In 1985, during the construction of a skyscraper in Austin, Texas, the remains of a mastodon were unearthed. If only 1/64 of the

Art [367]

Answer:

<u>34,380 years</u>

Explanation:

The remaining amount of a radioactive isotope is found as the product of the original amount by (1/2) raised to the number of half-lives elapsed. The formla is:

M = M₀ × (1/2)ⁿ

Where M is the remaining amoun, M₀ i s the initial amount, and n is the number of half-lives.

Here, 1/64 of the original carbon-14 remained, meaning that M/M₀ = 1/64.

Then, you can substitute in the equation and solve:

(1/64) = (1/2)ⁿ

(1/2⁶) = (1/2ⁿ)

2⁶ = 2ⁿ

6 = n

Then, 6 half-lives elapsed since the mastodon died and the remains were dated.

Then, you must multiply 6 by the <em>half-life </em>time:

6 × 5730 years = 34,380 years ← answer

8 0

3 years ago

What is the temperature at which a solid melts?

Diano4ka-milaya [45]

Generally speaking, solid turns to a liquid at it's melting point. Ice turns to water at 0 degrees Celcius. Chocolate melts at 25 degrees Celcius-Yum! Ice (solid) thaws when the temperature rises above 32 degrees Fahrenheit, becoming water (liquid). Other solids (oddly) vary. your welcome

3 0

3 years ago

Please help!!!

larisa86 [58]

Answer:

Explanation:

mass of top book = 2kg

mass of book under = 3kg

mass of table = 20kg

a) The diagram is in the attached file to this solution

b) Since the objects are at rest, the acceleration of each of the object is zero

c) Force of gravity giving that g = 10 is

for the top book = 2*10 = 20N

for the book under = 3*10 = 30N

for the table = 25*10 = 250N

d) for the top book = 2*10 - 2*10= 0N

for the book under = 3*10 - 3*10 = 0N

for the table = 25*10 - 25*10 = 0N

8 0

3 years ago