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3 years ago

What does it mean if one person has a higher value for power?

Physics

2 answers:

notka56 [123]3 years ago

8 0

Answer:

Explanation:

Power is defined as the ratio of work done to the time taken.

Power = Work / time

If more power then it means a large amount of work done in small interval of time.

Thus, it means the person performs more work in small interval of time.

gogolik [260]3 years ago

7 0

That means a person may have a lot of energy (work) and less time it took for a person to do something. Because the formula for power is P= w/t more work and less time more power!
Hope this helps

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A wave has 25 wavelengths in 5 secs. The frequency of the wave is _.

kati45 [8]

Heyyyy I wish I could help but I don’t know

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3 years ago

Assume that the average mass of each of the approximately 1 billion people in China is 55 kg.Assume that they all gather in one

Harman [31]

Answer: $5.9(10)^{-8} m$

Explanation:

The equation to calculate the center of mass $C_{M}$ of a particle system is:

$C_{M}=\frac{m_{1}r_{1}+m_{1}r_{1}+...+m_{n}r_{n}}{m_{1}+m_{2}+...+m_{n}}$

In this case we can arrange for one dimension, assuming the geometric center of the Earth and the ladder are on a line, and assuming original center of mass located at the Earth's geometric center:

$C_{M}=\frac{m_{E}(0 m) + m_{p} r_{E-p}}{m_{E}+m_{p}}$

Where:

$m_{E}=5.9(10)^{24} kg$ is the mass of the Earth

$m_{p}=55(10)^{9} kg$ is the mass of 1 billion people

$r_{E}=6371000 m$ is the radius of the Earth

$r_{E-p}=6371000 m- 2m=6370998 m$ is the distance between the center of the Earth and the position of the people (2 m above the Earth's surface)

$C_{M}=\frac{m_{p}55(10)^{9} kg (6370998 m)}{5.9(10)^{24} kg+55(10)^{9} kg}$

$C_{M}=5.9(10)^{-8} m$ This is the displacement of Earth's center of mass from the original center.

8 0

3 years ago

Fig. 2.1 shows a train

Vitek1552 [10]

Answer:

$\mathrm{(a)\:}32,000,000\:\mathrm{Ns},\\\mathrm{(b)\:}390,000\:\mathrm{N}$

Explanation:

The impulse-momentum theorem states the impulse on an object is equal to the change in momentum of that object. Momentum is given by $p=mv$ . Since mass is constant, the train's change in momentum is:

$\Delta p=m\Delta v=750,000\cdot42=31,500,000=\fbox{$32,000,000\:\mathrm{Ns}$}$ (two significant figures).

Impulse is also given as $\Delta p = F\Delta t$ , where $F$ is the average force applied and $\Delta t$ is change in time. Since $t$ is given as $80\mathrm{s}$ , we have the following equation:

$F\Delta t=\Delta p\\\\F=\frac{\Delta p}{\Delta t},\\\\F=\frac{31,500,000}{80},\\\\F=393,750=\fbox{$390,000\:\mathrm{N}$}$ (two significant figures).

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3 years ago

If the distance of a charged particle from a wire changes from 10cm to 20 cm , what happens to its magnetic field

postnew [5]

Answer:

i would say it decreases

Explanation:

bc as distance grows the fields decrease

IM NOT SURE tho

5 0

3 years ago

Read 2 more answers

A 5kg box rests on a table. a 3 kg box rests on top of the 5 kg box. what is the normal force from the table?

Murrr4er [49]

==> The total mass resting on the table is (5 kg + 3 kg) = 8 kg.

==> The total weight of that mass is (8 kg) x (9.8 m/s) = 78.4 newtons

==> The boxes are stacked. So the table doesn't know if the weight on it is coming from one box, 2 boxes, 3 boxes, or 100 boxes in a stack. The table only knows that there is a downward force of 78.4 newtons on it.

==> The table stands in a Physics classroom, and it soaks up everything it hears there. It knows that every action produces an equal and opposite reaction, and that forces always occur in pairs.

Ever since the day it was only a pile of lumber out behind the hardware store in the rain, the table has known that in order to maintain the good reputation of tables all over the world, it must resist the weight of anything placed upon it with an identical upward force. This is the normal thing for all good tables to do, up to the ultimate structural limit of their materials and construction, and it is known as the "normal force".

So the table in your question provides a normal force of 78.4 newtons. (d)

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3 years ago