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3 years ago

While ice skating, you unintentionally crash into a person. Your mass is 60kg

Physics

1 answer:

miss Akunina [59]3 years ago

3 0

Answer:

The speed is 6.1m/s with an angle of 56.3 degrees north of east.

Explanation:

We meed to apply the Linear momentum theorem:

$m1*vo1+m2*vo2=m1*vf1+m2*vf2\\60*(8.0m/s(East))+80*(9.0m/s(North))=140*vf\\vf=3.4m/s(East)+5.1m/s(North)$

The magnitude of the velocity is given by:

$v=\sqrt{Veast^2+Vnorth^2} \\v=6.1m/s$

and the angle:

$\alpha =arctg(\frac{Vnorth}{Veast})\\\alpha=56.3^o$

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If f(x) = x2 - 3x + 1 and f(2 a) = 2f(a) then a is equal to

loris [4]

For these question, it has two separate equations: 2f(a) and f(2a) .

For f(2a) equations its x=2a, so you must substitute 2a into the f(x) equation

For 2f(a), it means the two time of f(a) equation with x=a, so you substitute a inti f(x) equation first, then you multiply it by 2.

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3 years ago

One mole of an ideal gas does 3000 J of work on its surroundings as it expands isothermally to a final pressure of 1.00 atm and

taurus [48]

Answer:

(a) Initial volume will be 7.62 L

(b) Final temperature will be 303.85 K

Explanation:

We have given one mole of ideal gas done 3000 J

So work done W = 3000 J

Let initial volume is $V_1$ and initial pressure $P_1=1atm$ ( As pressure is constant )

Final volume $V_2=25L$ = 0.025 $m^3$

Number of moles n = 1

(B) From ideal gas of equation we know that $PV=nRT$

So $1.01\times 10^5\times0.025=1\times 8.31\times T$

T = 303.85 Kelvin

(B) For isothermal process work done is equal to

$W=nRTln\frac{V_2}{V_1}$

$3000=1\times 8.314\times 303.85\times ln\frac{0.025}{V_1}$

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3 years ago

Consider light energy that is momentarily absorbed in glass and then re-emitted. Compared to the absorbed light, the frequency o

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The frequency of the re-emitted light is identical to that of the absorbed light.

To find the answer, we need to know more about the frequency of light.

<h3> Why the re-emitted light has the same frequency?</h3>

The wavelength of the light that is momentarily absorbed in glass and then re-emitted is the same, which explains why the re-emitted light has the same frequency as the absorbed light and the frequency of the absorbed light is the same.
An electromagnetic wave's energy is inversely related to its frequency.
The relationship between the wave's wavelength and frequency depends on the speed of light:

$frequency=\frac{c}{wave length}$ , c is the speed of light.

Despite not having mass, light still has energy, and that energy is conserved.
As a result, in order for there to be energy conservation, the energy of the light that is received and reemitted must be equal.

Thus, we can conclude that, the re-emitted light's frequency matches the absorbed light's frequency.

Learn more about frequency here:

brainly.com/question/26754018

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1 year ago

If a train conductor is describing the speed of the train as well as the direction of the train is going to then the train condu

dolphi86 [110]

Answer:

With all of that information, he's telling us the train's VELOCITY.

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3 years ago

What is your displacement if you walk 100 m north, 20 m east, 30 m south, 50 m west, and then 70 m south?

velikii [3]

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3 years ago