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julia-pushkina [17]
3 years ago
8

If an airplane undergoes a displace-

Physics
1 answer:
PIT_PIT [208]3 years ago
4 0
The formula for velocity is distance divided by time, or d/t. The distance is 500 km and the time is 1.2 hours. 500/1.2 is 416.6 km/hr.
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If something is 50% efficient, how many joules of wasted energy will there be if 750J of energy is put in?
Andreas93 [3]

Answer:

<u><em>375 J</em></u>

Explanation:

<u><em>Total energy</em></u> = 750 J

<u><em>Efficiency</em></u> = 50%

<u><em>Wasted energy</em></u> = 50% [100% - 50%]

<u><em>Amount of wasted energy</em></u>

= 750 x 50%

= 750 x 0.5

= 375 J

7 0
2 years ago
Read 2 more answers
Write a hypothesis about how the number of half-lives affects the number of radioactive atoms. Use the "if . . . then . . . beca
Roman55 [17]

Answer:

Explanation:

Answer:

Explanation:

The half life is the time taken for half of a radioactive substance to disintegrate.

The shorter the half life, the larger the decay constant and the faster the decay process.

For a very large half life, it would take a very long time for the radioactive nuclide to decay to half.

With each half life reached, a new set of daughter cell is formed. Atoms that have short half life would decay rapidly. Every radionuclide has its own characteristic half-life.

If the number of half-lives increases, then the number of radioactive atoms decreases, because approximately half of the atoms' nuclei decay with each half-life. With this observation, we can hypothesise and conduct experiment to support the assertion that as the number of half-lives increases then the number of radioactive atoms decreases.

8 0
4 years ago
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Question 4 of 25
Zinaida [17]

Answer:

Both nuclear fission and nuclear fusion produce energy from

matter

:D

5 0
3 years ago
Why do two elements silver and iron have different properties
Nimfa-mama [501]
Because the atomic number is diffrent and I belive that they also have diffrent atomic masses
7 0
3 years ago
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Write an equation that expresses the first law of thermodynamics in terms of heat and work.
OleMash [197]

Answer:

Heat Input = Work Output       (at 100% efficiency)

ΔQ = ΔW

(you cannot get something for nothing)

3 0
2 years ago
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