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grin007 [14]
3 years ago
8

Waves can transfer energy through

Physics
1 answer:
lina2011 [118]3 years ago
3 0

Answer:

electromagnetic waves

Explanation:

"wave" is a common term for a number different ways in which energy is transferred

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Name 3 examples of the Doppler Effect
sveta [45]

Answer:

The drop in pitch of ambulance sirens as they pass by and the shift in red light are common examples of the Doppler Effect.

...

It is used in:

Sirens.

Astronomy.

Radars.

Medical imaging and blood flow management.

Flow management.

Velocity profile management.

Satellite communication.

Audio.

(It is so much but you can select three of them and write it)

5 0
3 years ago
2. A person lifts 200kg seven times over the course of 11.8s. If they displaced the weight 2.2m up each time, how much power did
Aneli [31]

Answer:

<em>The person delivered a power of 2,558 Watt</em>

Explanation:

<u>Work and Power</u>

Mechanical work is the amount of energy transferred by a force. It's a scalar quantity, with SI units of joules.

Being  the force vector and  the displacement vector, the work is calculated as:

W=\vec F\cdot \vec s

If both the force and displacement are parallel, then we can use the equivalent scalar formula:

W=F.s

Power is the amount of energy transferred per unit of time. In the SI, the unit of power is the watt, equivalent to one joule per second.

The power can be calculated as:

\displaystyle P=\frac {W}{t}

Where W is the work and t is the time.

If the person lifts a mass of m=200 Kg, then exerts a force equal to its weight:

F = m.g = 200*9.8 = 1,960

F = 1,960 N

The work done when lifting the weight 7 times by a distance of s=2.2 m is:

W = 7*1,960*2.2=30,184

W = 30,184 J

Finally, the power delivered in t=11.8 seconds is:

\displaystyle P=\frac {30,184}{11.8}

P = 2,558 Watt

The person delivered a power of 2,558 Watt

4 0
3 years ago
Two boxes are connected by a string. The first box has a mass of 4.2 kg and the
denis23 [38]

Answer:

........

Explanation:

8 0
3 years ago
It decomposes in a first-order reaction with a rate constant of 14 s–1. how long would it take for an initial concentration of 0
VikaD [51]
The rate constant of a reaction can be computed by the ratio of the changes in the concentration and time take taken for it to decompose. Thus, if the rate constant is given to be 14 M/s, we have 

rate = \frac{-(C_{new} - C_{old})}{t}

where C are the concentration values and t is the time taken for it to decompose.

14 = \frac{-(0.02 - 0.06)}{t}
t = 0.003 s

Thus, it will take 0.003 s for it to decompose.
Answer: 0.003 s

4 0
3 years ago
In the first law of Thermodynamics ΔE = Q - W, what does ΔE stand for???
Alexxx [7]
<span>Δ</span>E = q + w

q = heat (quantity of)

q and w can be positive or negative depending on if work/heat is being absorbed/done on the system or released/done by the system
7 0
2 years ago
Read 2 more answers
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