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Eduardwww [97]
3 years ago
14

What is the momentum of 70 kg runner traveling at 10 m/s?

Physics
2 answers:
Ivenika [448]3 years ago
8 0
700 kg m/s
Because momentum is mass times velocity
valentina_108 [34]3 years ago
5 0

Answer : The momentum of 70 kg runner is, 700 kg.m/s

Explanation :

Momentum : It is defined as the motion of a moving body. Or it is defined as the product of mass of velocity of an object.

Formula of momentum is:

p=mv

where,  

p = momentum  = ?

m = mass  = 70 kg

v = velocity  = 10 m/s

Now put all the given values in the above formula, we get:

p=(70kg)\times (10m/s)

p=700kg.m/s

Therefore, the momentum of 70 kg runner is, 700 kg.m/s

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Answer:

E_0=225.09N/C

Explanation:

We are given that

Power,Ptot=960mW=960\times 10^{-3}W

1mW=10^{-3} W

Wavelength,\lambda=360 nm=360\times 10^{-9} m

1nm=10^{-9} m

Distance,r=2.5 cm=2.5\times 10^{-2} m

1m=100 cm

Efficiency=55%

Power radiation emitted=\frac{55}{100}\times 960\times 10^{-3}=0.528W

Intensity,I=\frac{P}{4\pi r^2}

I=\frac{0.528}{4\pi(2.5\times 10^{-2})^2}=67.26W/m^2

Intensity,I=\frac{1}{2}c\epsilon_0E^2_0

E^2_0=\frac{2I}{c\epsilon_0}

Where \epsilon_0=8.85\times 10^{-12}

c=3\times 10^8 m/s

E_0=\sqrt{\frac{2I}{c\epsilon_0}}

E_0=\sqrt{\frac{2\times 67.26}{3\times 10^8\times 8.85\times 10^{-12}}}

E_0=225.09N/C

4 0
3 years ago
2. A book with a mass of 2 Kg is resting on a shelf 1.5 m off the floor. How much gravitational
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Book of mass 2 kg is lifted from floor to the table. The height between floor and the table is 1.5 m. Calculate the work done by gravitational force.

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A car starts from rest and after 7.0 seconds it is moving at 42 m/s. What is the car's average acceleration?
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<h2>Answer:</h2>

<em>Hello, </em>

<h3><u>Q</u><u>UESTION)</u></h3>

<em>✔ We have : a = v/Δt </em>

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The car's acceleration is therefore 6 m/s².

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A flea walking along a ruler moves from the 45 cm mark to the 27 cm mark. It does this in 3 seconds. What is the speed? What is
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Answer:

Explanation:

In the calculation of distance we do not take into account the direction of movement .So only magnitude of movement is taken care of.

On the other hand , in respect of displacement , we take into account even direction of movement along with magnitude.

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